The Bosch 300 Series WAT28400UC is not a connected washer: Bosch's use and care manual for it describes a cycle selector, a display and buttons for Temperature, Spin Speed, Finish in and Start/Pause, with a Child lock and a Finish in delay of up to 24 hours, and nothing about a network. Bosch's Home Connect app belongs to its connected washers; Bosch USA's error-code page lists Home Connect App as its own category. If a phone app is what is failing, it is for a different model. On this washer you set a delayed finish with the Finish in button and read progress from the display.
Differential
Likely causes of “Bosch 300 Series WAT28400 front-load washer will not connect to Wi-Fi”, and how to tell them apart
- 1
Expecting Home Connect features on a non-connected model
What separates it There is no pairing mode and no app listing because Home Connect features are expected on a non connected model
How to confirm Compare the model on the plate inside the door with the manual: WAT28400UC has no connectivity
- 2
A different Bosch washer's app instructions
What separates it Steps refer to menus this washer does not have
How to confirm Use only the WAT28400UC manual's controls: selector, buttons and display
- 3
Finish in delay running
What separates it The washer looks idle after Start because Finish in delay is running
How to confirm Check the display for a Finish in time; it counts down to the wash start
- 4
A smart plug or monitor at the outlet
What separates it The plug reports offline but the washer runs because a smart plug or monitor is at the outlet
How to confirm Plug the washer directly into a grounded outlet and start from the panel
Before you touch a setting
Record this first — changing settings destroys the evidence
- What the app or device says and what appliance it is for
- Whether a Finish in time is showing
- Whether the washer runs from its own Start/Pause button
Try in this order
0 of 5 completedConfirm the model
ReversibleThe identification plate is inside the door or on the back. The WAT28400UC has a selector, a display and buttons only.
Start at the panel
ReversibleTurn the cycle selector to a cycle, check the pre-set temperature and spin speed lamps, and touch Start/Pause.
Use Finish in for timing
ReversibleTouch Finish in to delay the end time in one hour steps up to 24 hours; the display counts down to the wash start.
Read the display
ReversibleEnd shows when the cycle finishes; a foam symbol means the washer added a rinse.
Set a phone reminder
ReversibleSet a phone reminder, since there are no notifications, and the washer's cycle times are shown on the display.
Model-specific
What is true of this model and not of its siblings
- Specification notes (WAT28400UC)
- 15.4 lb (7 kg) drum capacity for regular cotton loads, a large door opening with a magnetic lock and 160 degree opening angle, and low washing and spinning noise, per Bosch's manual. Controls are a cycle selector, Start/Pause, Temperature, Spin Speed and Finish in buttons, and options including SpeedPerfect, Prewash and Extra Rinse. The manual describes a pull-out drain hose that can drain up to 5.3 U.S. gallons (20 liters), and Bosch's customer service line is 1-800-944-2904.
- Where the display info comes from
- When a cycle is selected the display shows its duration and the indicator lamps for the pre-set temperature and spin speed light up. After the cycle, End appears in the display and the Start/Pause lamp is off. If the foam symbol appears the washer detected too much foam and added a rinse, and Bosch's advice is to use less detergent next time with the same load.
- Finish in in Bosch's example
- Bosch gives a worked example: with a 2 hour 30 minute cycle and an 8 hour Finish in time, the display shows 8 h until the energy-saving mode activates and counts down for about 5 hours 30 minutes, then the wash begins at 2 hours 30 minutes and the display switches to the cycle duration. The total is about 8 hours, so a washer waiting on Finish in has not stalled.
- Parts for this problem on the WAT28400 (RepairClinic, 2026-09-20)
- display, part number 00635431, at $51.67; operating module pro, part number 11027074, at $183.33.
- Other models this page answers
- These steps also fit the 300 Series WGA12400UC washer, 800 Series WAW285H2UC washer, 800 Series WGB24600UC washer.
Stop boundary
When this stops being a self-service repair
- !If the washer will not start from its own panel, follow the door or power pages
- !If a code such as E:18 or E:93 shows, follow the error pages
Evidence ledger
Sources behind this answer
Where the manufacturer's article stops. The controls, cleaning steps, hose rules, troubleshooting table and error messages below are that manual's own. Bosch's 500 and 800 Series washers and its older models differ in controls and messages, so confirm the model on the identification plate inside the door before relying on a message here.
Bosch's own US owner-support pages for washer error codes and self-help.
Parts and list prices as shown on RepairClinic's parts search for this model number on 2026-09-20.
Exact questions
Common questions
Does the Bosch WAT28400UC have Wi-Fi?+
No; Bosch's manual for it lists no connectivity or app.
What is Finish in?+
A delay function: you set the time the cycle should end, in one hour steps up to 24 hours.
How do I know when the cycle is done?+
End appears in the display and the Start/Pause lamp goes off.
Can I start it from my phone?+
No; the door must be closed and Start/Pause touched at the washer.
What does the foam symbol mean?+
The washer detected too much foam and automatically added an extra rinse.
Who do I call for Bosch service?+
Call Bosch customer service at 1-800-944-2904, if you need help.
What does the D symbol mean on the Bosch WAT28400?+
The D symbol means that the Child lock is active, so deactivate it to change settings.
Which detergent suits the WAT28400?+
Use HE detergent only, in the recommended amount, and use the dosing cup for liquid detergent.