Universal diagnostic library
Consumer-product troubleshooting by exact model, symptom and code
Error codes, symptoms, indicators and components converge on the same safe diagnostic path. Every decode rule states its evidence grade and source. Start from your exact model, the symptom you see or the code on the display, then follow the direct answer, the safe checks and the point where a technician is the better call.
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5,079 complete records in this directory
A Roku app will not open, loads black or keeps crashing
Check whether other apps work, update Roku software, restart the device, then remove and reinstall only the affected app. Reinstalling may require that service’s sign-in credentials. Note the app's name and any error number first, since the maker's support page may list a fix for that exact app.
Open record Component diagnostic recordAir-conditioner contactor: function, symptoms, testing boundary and repair difficulty
Air-conditioner contactor switches high-voltage power to compressor and fan. Related symptoms include outdoor unit silent, buzzing, chattering or running while off. Those symptoms do not prove the component failed: confirm thermostat demand and external disconnect/breaker state.
Open record iPhone · AirDropAirDrop cannot find the other device
Turn on Wi-Fi and Bluetooth on both Apple devices, move them nearby, set the receiver to Contacts Only or Everyone for 10 Minutes, and restart both devices. Personal Hotspot can interfere with the local discovery path. Both devices must be unlocked and awake while you try, and the receiver should stay on the AirDrop screen.
Open record Mac · AirDropAirDrop is not working between a Mac and iPhone
Enable Wi-Fi and Bluetooth on both devices, put them nearby, open AirDrop on the Mac and make the receiver discoverable, then restart both devices. Confirm Contacts Only has matching Apple Account contact details. AirDrop also needs the screen on and unlocked on the receiving device, so wake it before you send.
Open record Samsung TV · AirPlayAirPlay is not working on a Samsung TV
Confirm the TV model supports AirPlay, put the Apple device and TV on the same Wi-Fi, enable Apple AirPlay Settings on the TV, then update and restart both devices. Reset paired AirPlay devices only after basic discovery checks fail.
Open record AirPods · charging caseAirPods case will not charge
A case can fail to charge because of cable/adapter, port debris, wireless alignment, temperature or battery damage. Test wired charging from known power before resetting AirPods.
Open record Smart home · routinesAlexa routine runs only sometimes
Intermittent routines usually fail at the trigger, one action, device reachability or timing condition. The activity history shows where the chain stopped.
Open record Android · AppsAn Android app keeps crashing or will not open
Force stop the app, restart the device, update the app and Android, then clear the app cache. Clear storage or uninstall only with credentials and synced data available because either can remove local app state. Note the app version before and after updating, since a crash that began after an update points to that version.
Open record Apple TV · AppsAn Apple TV app is frozen or will not open
Force-quit only the affected app, reopen it, restart Apple TV, then update the app and tvOS. Delete or reset the app last because local app data and sign-in state may be removed. Holding the Back and TV buttons together for several seconds restarts the Apple TV when the screen is frozen.
Open record iPhone · AppsAn iPhone app keeps closing, freezing or will not open
Close and reopen the app, restart iPhone, update the app and iOS, then delete and redownload the app last. Deletion can remove data stored only inside that app. Settings, Privacy and Security, Analytics shows whether iOS has logged the crash, which helps if you report it to the app's maker.
Open record Android · Wi-FiAndroid is connected to Wi-Fi but has no internet
Compare Wi-Fi with mobile data, test another device on the same network, restart the phone and router, then forget and reconnect to the network. Reset Wi-Fi, mobile and Bluetooth settings only after noting that it removes saved connections.
Open record Android · keyboardAndroid keyboard disappeared or will not open
If no keyboard appears in any app, the input method may be disabled, crashed or not selected. If one app is affected, treat it as that app’s layout problem.
Open record Android · notificationsAndroid notifications arrive late or only after unlocking
Delayed alerts usually come from per-app notification settings, battery optimization, restricted background data, Focus/Do Not Disturb or a vendor sleep list.
Open record Android · incoming callsAndroid phone rings but the incoming-call screen does not appear
A missing call screen can result from Phone app notifications, display-over-app permission, default-phone selection or a stuck call app—not the cellular connection itself.
Open record Android · storageAndroid storage is full even with few photos
Hidden storage is often app caches/downloads, offline media, messaging attachments, trash or system update files. Use the storage breakdown before deleting app data.
Open record Android · BluetoothAndroid will not pair with a Bluetooth device
Turn Bluetooth off and on, restart both devices, make the accessory discoverable and keep it nearby, then forget and re-pair it. Check whether the accessory is still connected to a different phone before resetting network settings. Android keeps a list of paired devices on each phone, so remove old pairings if the list is long.
Open record iPad · Apple PencilApple Pencil connects but will not write
A connected Pencil that will not draw can have a loose/worn tip, unsupported app state, low charge or model incompatibility. Test in Apple Notes before changing an art app.
Open record Apple TV · PictureApple TV has no picture or the screen is black
Select the correct HDMI input, reconnect the cable and power, test another HDMI input, then connect Apple TV directly to the television. Use Apple’s resolution-reset procedure only if the device is clearly powered but the display cannot show its current format.
Open record Apple TV · AudioApple TV has picture but no sound
Raise volume and select the intended output, reseat HDMI, restart the television and Apple TV, then connect Apple TV directly to the TV. Change Audio Format only after the hardware path is isolated. Check that the TV's own speakers or the soundbar are set as the output, since the Apple TV can be sending sound to a device that is off.
Open record Apple TV · Wi-FiApple TV will not connect to Wi-Fi
Restart Apple TV, confirm the network under Settings › Network, restart the router and modem, then test Ethernet when the model supports it. Do not reset Apple TV until a stable internet connection has been proven. Check the router for a MAC address filter, which can block a device from joining without any error on the Apple TV.
Open record Apple Watch · activityApple Watch activity rings are not updating
Missing activity can follow loose fit, wrist-detection settings, paused workout, calibration or Health permission—not necessarily a dead sensor.
Open record Apple Watch · notificationsApple Watch is not receiving notifications
Notifications normally go to iPhone when it is unlocked and to Apple Watch when the phone is locked and the watch is worn/unlocked. Focus, app mirroring and connection state can change routing.
Open record Windows · Bluetooth audioBluetooth headphone sound quality drops during calls
Many Bluetooth headsets switch from high-quality stereo playback to a bidirectional hands-free profile when the microphone is used. That behavior is a profile limit, not necessarily interference.
Open record Windows · BluetoothBluetooth is missing or not working in Windows 11
Turn off Airplane mode, toggle Bluetooth, restart the PC and accessory, then run the Bluetooth troubleshooter and update the adapter driver. Remove and re-pair only the affected accessory before reinstalling drivers. If the Bluetooth switch is missing from Settings, check Device Manager for an adapter with a warning mark.
Open record Bluetooth audio · routingBluetooth speaker pairs but no sound plays
Pairing confirms a control link, but audio may still route to another output, use the wrong profile or be muted in the source app/device.
Open record Printers · photo layoutBorderless photo printing crops the edges
Borderless printing deliberately enlarges the image past the paper edge to avoid white borders. The expansion amount, aspect ratio and app crop control determine what is lost.
Open record Brother printer · OfflineBrother printer is offline or will not print
Clear any printer-panel error, confirm the cable or same-network connection, set the correct Brother queue as default, and clear paused jobs. Reinstall the full driver package only after the device is reachable. A printer that is offline from only one computer usually has a port or queue problem on that computer, not a hardware fault.
Open record Canon printer · OfflineCanon printer says offline in Windows
Verify printer power and panel status, select the correct Canon queue, power-cycle the printer, then confirm Wi-Fi communication and restart the router/computer. Clear Use Printer Offline before reinstalling software. Setting a fixed address for the printer in the router stops the connection dropping when its address changes.
Open record TV & streaming · captionsCaptions are late, early or do not match the audio
Caption timing can be wrong in one program, one app, an external source or after an audio-delay change. Compare the same title on another device before resetting the TV.
Open record iPhone · CarPlayCarPlay will not connect to iPhone
Confirm the vehicle and country support CarPlay, unlock iPhone, test the correct USB port and cable or enable Wi-Fi/Bluetooth for wireless CarPlay, then restart the phone and car. Forget the car and set it up again only after those checks.
Open record Chromebook · sessionChromebook keeps signing out or returning to the login screen
Unexpected sign-outs can be a crash, storage pressure, managed-session policy, account token problem or power interruption. Determine whether the whole device restarts.
Open record Chromebook · startupChromebook will not turn on but the charge light is on
A charge light proves some adapter power, not that the battery, display or system completed startup. Remove accessories and try the model’s hardware reset before recovery.
Open record Gaming · downloadsConsole downloads are slow but online games work normally
Downloads need sustained throughput while gameplay uses little bandwidth but needs low latency. Server load, storage write speed, background games and Wi-Fi band can limit download rate.
Open record Component diagnostic recordConsumer-device lithium battery: function, symptoms, testing boundary and repair difficulty
Consumer-device lithium battery stores energy and supplies regulated power. Related symptoms include rapid drain, shutdown, charging refusal, swelling or heat. Those symptoms do not prove the component failed: separate software use and charger issues from physical warnings.
Open record Bradford White · Serial number decoderDecode a Bradford White serial number: find the age
Bradford White's own website publishes the complete year-letter and month-letter tables for its water heaters, including the 20-year repeat cycle and the December 2007 production-number length change.
Open record Briggs & Stratton · Serial number decoderDecode a Briggs & Stratton standby-generator engine date code
Read the manufacture date from a Briggs & Stratton engine Code without confusing it with the generator’s serial label.
Open record Carrier · Serial number decoderDecode a Carrier serial number: find the age and manufacture week
Carrier furnaces, air conditioners and heat pumps made since the early 1990s encode the production week and year in the first four digits of the serial number, confirmed against Carrier's own published warranty serial range.
Open record Champion Power Equipment · Serial number decoderDecode a Champion generator serial number: find the age
Champion's own help center publishes a clear year-then-month rule, but only for engines built before 2011 — current-production decoding could not be confirmed and is stated as a gap, not guessed at.
Open record GE Appliances · Serial number decoderDecode a GE appliance serial number: find the age
GE's own support page publishes the complete month-letter and year-letter tables directly, including the 12-year repeat cycle and GE's own worked example.
Open record Goodman, Amana & Daikin · Serial number decoderDecode a Goodman, Amana or Daikin serial number: find the age
Current Goodman, Amana and Daikin residential HVAC equipment uses the simplest format in this group: the first four serial digits are year then month, confirmed by Goodman's own page and an independent trade source.
Open record KitchenAid · Serial number decoderDecode a KitchenAid major-appliance serial number: find the age
Current KitchenAid major appliances share Whirlpool's own serial system. This page points to the shared rule and explicitly excludes small countertop appliances, which are not confirmed to use the same system.
Open record Kohler · Serial number decoderDecode a Kohler generator engine serial number: find the age
Kohler used a running numeric index rather than a simple two-digit year, and the index's meaning shifted as the serial number itself grew longer between 1965 and 2011.
Open record Lennox · Serial number decoderDecode a Lennox serial number: find the age and manufacture month
Lennox confirms its serial numbers carry production information but does not itself publish the digit table; independent HVAC-trade sources converge on plant, then year, then a month letter.
Open record Maytag · Serial number decoderDecode a Maytag serial number: find the age
Maytag has used Whirlpool's own serial system since Whirlpool's 2006 acquisition. This page points to the shared rule rather than repeating it, and states plainly that pre-2006 Maytag used a separate, unverified system.
Open record Rheem · Serial number decoderDecode a Rheem HVAC serial number: find the age and manufacture week
Rheem's own contractor-facing article states the rule directly: read the week and year from the two digit pairs that follow the letter in the serial number. This is a different rule than Rheem's water-heater serial numbers.
Open record Rheem, Ruud & Richmond water heaters · Serial number decoderDecode a Rheem water heater serial number: find the age
Rheem's own official water-heater page states the rule directly: month, then year, then a plant letter. This is the opposite emphasis from the week-then-year rule this site documents for Rheem's HVAC equipment.
Open record Samsung · Serial number decoderDecode a Samsung appliance serial number: what this page can and can't confirm
Two independent sources agree on where Samsung's date code sits but disagree with each other on the letter-to-year mapping, so this page states the code's position without computing a date from it.
Open record State · Serial number decoderDecode a State water heater serial number: find the age
State's legacy letter-month format is well confirmed. Its current all-numeric format is not: the independent source documenting it explicitly flags that other guides claim the opposite digit order.
Open record Trane · Serial number decoderDecode a Trane serial number: find the age and manufacture week
Trane and American Standard equipment made since roughly 2000 encodes year and week in the serial number's leading digits. Trane's own decode article could not be reached during verification, so this reading relies on independent trade cross-checking.
Open record Whirlpool · Serial number decoderDecode a Whirlpool serial number: find the age and production week
Independent references agree on Whirlpool's serial structure and on the 1996–2002 year letters, but genuinely disagree with each other on the letters used from 2003 onward — this page states the confirmed range and stops there.
Open record York · Serial number decoderDecode a York serial number: find the age and manufacture month
York, a Johnson Controls brand, changed its serial format around October 2004. Reading the wrong era's rule produces a wrong decade, not just a wrong year — this page covers both, from independent technician references.
Open record A.O. Smith · Serial number decoderDecode an A.O. Smith water heater serial number: find the age
A.O. Smith has changed its water-heater serial format at least four times. The current format since 2008 reads year-then-week; three older, less certain formats used different orders.
Open record LG · Serial number decoderDecode an LG appliance serial number: find the month and narrow the decade
An LG serial number starts with one digit for the year and two for the month, so it narrows the manufacture year only to a repeating 10-year cycle; a purchase date or manual date settles the decade.
Open record iPhone · Personal HotspotDevices connect to iPhone hotspot but have no internet
A hotspot can broadcast Wi-Fi even when the iPhone has no usable cellular data, the plan blocks tethering or VPN/network settings interfere.
Open record Home networking · roamingDevices stay connected to a far-away mesh node
Client devices decide when to roam, so a phone may cling to a usable distant node. Excessively close mesh points, transmit power and stale client state can worsen it.
Open record Home networking · migrationDevices will not connect after replacing the router with the same Wi-Fi name
Reusing an SSID/password can reconnect many devices, but changed security, band steering, DHCP or cached network parameters can block others.
Open record Component diagnostic recordDishwasher circulation pump: function, symptoms, testing boundary and repair difficulty
Dishwasher circulation pump pressurizes wash water through spray arms. Related symptoms include fills without washing, weak spray, grinding or motor codes. Those symptoms do not prove the component failed: confirm fill, spray-arm movement and approved filter condition.
Open record Component diagnostic recordDishwasher drain pump: function, symptoms, testing boundary and repair difficulty
Dishwasher drain pump moves wash water to the household drain. Related symptoms include standing water, drain codes, humming or silence. Those symptoms do not prove the component failed: clean the approved filter and prove the air gap, disposal and hose.
Open record Component diagnostic recordDishwasher leak or float sensor: function, symptoms, testing boundary and repair difficulty
Dishwasher leak or float sensor stops filling or starts draining when water reaches an unsafe area. Related symptoms include leak/overflow codes, continuous drain or refusal to start. Those symptoms do not prove the component failed: turn water off and identify the actual leak before resetting.
Open record Smart home · contact sensorDoor or window sensor says open when it is closed
A contact sensor can misread when magnet alignment, gap, orientation, battery or mounting has changed. Move the magnet near the sensor before deleting it from the system.
Open record Printers · duplexDouble-sided pages print upside down
Upside-down backs usually mean the duplex binding edge is wrong: flip on long edge versus short edge. Orientation and app print dialog both matter.
Open record Component diagnostic recordDryer gas ignition system: function, symptoms, testing boundary and repair difficulty
Dryer gas ignition system ignites and controls the burner through interlocked safeties. Related symptoms include no heat, intermittent heat, clicking or gas odor. Those symptoms do not prove the component failed: verify airflow, gas supply position and observable ignition sequence.
Open record Component diagnostic recordDryer heating element: function, symptoms, testing boundary and repair difficulty
Dryer heating element converts electrical power into controlled heat. Related symptoms include no/weak heat, heater codes or heat continuing incorrectly. Those symptoms do not prove the component failed: prove airflow, cycle and supply voltage before internal testing.
Open record Component diagnostic recordDryer thermal fuse: function, symptoms, testing boundary and repair difficulty
Dryer thermal fuse opens a safety circuit after over-temperature. Related symptoms include no heat, no start or shutdown after overheating. Those symptoms do not prove the component failed: inspect vent airflow and installation before blaming the fuse.
Open record Epson printer · OfflineEpson printer is offline on Wi-Fi
Print a nozzle check or internal status page without the computer, clear panel errors, confirm the printer and computer share a network, then restart all three. A successful internal print points to the computer, queue or network—not the print engine.
Open record Home networking · EthernetEthernet is connected but there is no internet
A link light shows electrical connection, not a valid IP route. Compare cable/port, DHCP address, router LAN status and another wired device.
Open record Kenmore · Who built itFind out who built your Kenmore appliance from its model number
Kenmore designs and sells appliances that other companies build. The first three digits of the model number, the prefix before the dot, say who built yours, and that decides which fault codes, parts and manuals apply.
Open record Fire TV · AppsFire TV apps freeze, crash or will not open
Force stop the affected app, clear its cache, restart Fire TV, and update the app and device. Clear app data or reinstall only if you know the service credentials because either can sign you out. Check Settings, My Fire TV, About for a pending system update, since crashes often follow an update that never finished.
Open record Fire TV · RemoteFire TV remote will not pair
Use fresh batteries, move the remote within range, restart Fire TV, then hold Home to pair. Remove nearby devices that may interfere and use the Fire TV mobile app only as a temporary same-network remote. A remote that works for a moment and then stops usually needs new batteries, even if the ones in it seem new.
Open record Fire TV · PictureFire TV shows no signal or a blank screen
Select the exact HDMI input, reseat Fire TV and its power adapter, restart the display, then test another HDMI port. Connect directly to the TV before blaming a receiver, switch or soundbar. Press the TV's own input button until the Fire TV logo appears, which proves that the TV can receive the signal.
Open record support · reviewed answerFire TV stuck on Optimizing system storage and applications
Allow the first optimization cycle to finish on stable power. If it repeats, remove USB accessories, restart the device and power source, then check free storage and software; do not interrupt every boot or immediately factory-reset.
Open record Fire TV · Wi-FiFire TV will not connect to Wi-Fi
Restart the Fire TV, verify the Wi-Fi name and password, restart the modem/router, and move the device closer. Forget and rejoin the network only after another device proves the internet connection works. A Fire TV that finds the network but has no internet usually needs the router restarted, not the stick reset.
Open record Fitbit · step accuracyFitbit counts steps while driving or sitting
Wrist motion and road vibration can resemble steps to an accelerometer. Placement, dominant-wrist setting and activity context affect false counts.
Open record Fitbit · syncingFitbit sync starts but never finishes
Partial sync can come from Bluetooth ownership, low battery, app permission, background restriction or account/service trouble. Keep data on the tracker while restoring the link.
Open record Component diagnostic recordFurnace flame sensor: function, symptoms, testing boundary and repair difficulty
Furnace flame sensor proves burner flame so gas can remain on. Related symptoms include burners light then stop, ignition lockout or flame-sense code. Those symptoms do not prove the component failed: record the sequence and exact code before assuming contamination.
Open record Component diagnostic recordFurnace pressure switch: function, symptoms, testing boundary and repair difficulty
Furnace pressure switch proves combustion-air and vent pressure before ignition. Related symptoms include inducer without ignition, pressure code or lockout. Those symptoms do not prove the component failed: inspect only exterior intake/exhaust blockage and condensate.
Open record Samsung Galaxy · USB moistureGalaxy moisture warning will not clear
The moisture/debris warning blocks wired charging to protect the USB port. Drying naturally and testing another cable is safer than heat, compressed air or inserting objects.
Open record Samsung Galaxy · S PenGalaxy phone or tablet does not detect the S Pen
S Pen detection depends on model support, tip/proximity behavior, magnetic accessories and—on Bluetooth models—charge and pairing. Screen writing and remote actions are separate tests.
Open record Gaming · voice chatGaming headset microphone works in chat test but not one game
A successful system mic test proves hardware and base permissions. One-game failure points to that game’s input selection, push-to-talk, party channel or privacy/account rules.
Open record Garmin · heart rateGarmin heart rate suddenly spikes during exercise
Optical heart-rate spikes can come from loose fit, cadence lock, cold skin, tattoos/hair, motion or sensor contamination. Compare a chest strap or manual pulse when safe.
Open record Garmin · GPSGarmin watch takes a long time to get GPS
Slow satellite lock can follow stale assistance data, indoor/urban obstruction, travel across regions or incomplete sync. Start outdoors with a clear sky and remain still.
Open record Component diagnostic recordGas oven igniter: function, symptoms, testing boundary and repair difficulty
Gas oven igniter heats so the safety valve can release gas. Related symptoms include long preheat, no flame, delayed ignition or cycling. Those symptoms do not prove the component failed: observe from outside the sealed burner area and note delay/odor.
Open record Generac · Serial number decoderGenerac serial numbers don't encode the age — here's what does
Generac's own support page confirms the serial number is sequential, not date-coded. The real manufacture date is a separate eight-digit field on the same data tag.
Open record Component diagnostic recordGenerator engine-speed sensing: function, symptoms, testing boundary and repair difficulty
Generator engine-speed sensing lets the controller verify cranking and running RPM. Related symptoms include RPM loss, under/overspeed or unexpected shutdown. Those symptoms do not prove the component failed: separate no-start from loaded shutdown and preserve history.
Open record Google TV · CastGoogle Cast cannot find or connect to Google TV
Put the sender and Google TV on the same non-guest Wi-Fi, confirm Google Cast is enabled, update both devices, and restart them. Router client isolation or a VPN can block discovery even when both devices have internet access.
Open record Smart home · voice processingGoogle Home keeps saying something went wrong
That response can mean internet loss, account/service trouble, unsupported command or one linked provider failure. A basic time/weather request separates core assistant access from a linked service.
Open record Google TV · AppsGoogle TV apps freeze, crash or will not load
Check Wi-Fi and system updates, restart Google TV, force stop the affected app, then clear that app’s data only if you know the credentials. Factory reset is the last resort because it erases device data. Check whether the crash is in one app or in all of them, since one app points to that app and all apps point to the TV.
Open record Google TV · ConnectionGoogle TV has Wi-Fi or video playback problems
Check whether the network works on another device, restart Google TV and the router, install system updates, then test another app. Clear data only for an app-specific failure; keep factory reset as a last resort. Test the same video on a phone on the same Wi-Fi, which shows whether the stream or the TV is at fault.
Open record Home networking · guest isolationGuest Wi-Fi cannot see the printer, TV or speakers
Guest networks usually block local-device discovery by design. Internet may work while printers and casting remain isolated.
Open record TV & streaming · HDMIHDMI device keeps losing signal for a few seconds
Intermittent HDMI loss is usually a cable-bandwidth, port, power or format-handshake problem. Test a direct, shorter signal path before changing every picture setting.
Open record Component diagnostic recordHDMI signal path: function, symptoms, testing boundary and repair difficulty
HDMI signal path carries negotiated video, audio and control data. Related symptoms include no signal, black screen, flicker, missing HDR/4K120 or audio. Those symptoms do not prove the component failed: test one known-good cable directly before advanced settings.
Open record TV & streaming · HDRHDR movies look too dark on the TV
HDR uses separate picture controls and preserves dark creative intent, but power saving, room lighting, wrong HDMI format or an inaccurate mode can make it unusably dim.
Open record Component diagnostic recordHeat-pump reversing valve: function, symptoms, testing boundary and repair difficulty
Heat-pump reversing valve changes refrigerant direction between heating and cooling. Related symptoms include heats in cooling, cools in heating or will not change modes. Those symptoms do not prove the component failed: prove thermostat configuration, outdoor operation and mode behavior.
Open record Smart home · HomePodHomePod plays music but will not control the smart home
Music playback proves speaker and some network access, while home control also depends on the Home membership, hub state, accessory reachability and account permissions.
Open record Trane furnace · indicatorHow to read a blinking light on a Trane furnace
Trane's own page says a furnace light's meaning depends on make and model and publishes no code table. Here is what Trane does say, what to record, and what the S9V2 control's fault menu shows.
Open record Carrier furnace · indicatorHow to read a Carrier furnace status-light code
Carrier's own guide explains the amber status light on its variable-speed furnaces: continuous on, off, rapid flashing, and the two-digit codes where short flashes are the first digit and long flashes the second.
Open record HP printer · OfflineHP printer is offline or unavailable
Check the printer display for an error, verify the USB or network connection, restart the printer and computer, then use HP’s diagnostic. Remove and re-add the printer only after confirming it remains on the correct Wi-Fi. Print a test page from the printer's own menu to learn whether the fault is the printer or its connection.
Open record Component diagnostic recordHVAC run/start capacitor: function, symptoms, testing boundary and repair difficulty
HVAC run/start capacitor supports motor starting and running. Related symptoms include humming, slow fan, protection trip or hot motor. Those symptoms do not prove the component failed: do not diagnose by appearance; qualified measurement is required.
Open record iPad · keyboardiPad keyboard covers a form or will not move
The on-screen keyboard may be docked, floating or split depending on model and settings. An app layout bug can look similar, so test the same field in Notes.
Open record iPhone · batteryiPhone battery drops sharply overnight
Overnight drain is usually revealed by Battery usage: background activity, weak cellular signal, navigation, syncing or battery condition. Measure one night before disabling broad features.
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