Direct answer
For the Sonos Era 100 speaker, output routing, volume/mute, app, Bluetooth profile and cable/HDMI path should be separated. First, select the device explicitly and play a system test tone.
What this covers
- Sonos Era 100 speaker (Era 100)
- Sonos product; Wi-Fi/Ethernet, Bluetooth, voice, home-theater and line-in capabilities vary.
- The specific fault this record addresses: connects but has no sound
What it does not cover
- ×The same symptom on a different Sonos product line, which has its own record and its own cited source
- ×An on-screen error code whose meaning has not been checked against this exact model's manual
- ×Live electrical, gas, sealed-system, internal battery-cell or structural repair — a technician boundary, not a self-service step
Differential
What actually causes this, and how to tell them apart
These are ordered by how often each one is the answer, not by how easy it is to try. The point of the middle column is that two causes producing the same headline symptom rarely produce the same detail — that detail is what tells you which one you have before you change anything.
- 1
Audio is routed elsewhere
What separates it The accessory shows as connected while sound plays from the phone or another device.
How to confirm Connection and audio routing are separate. Select the accessory explicitly as the output.
- 2
The volume is at zero on one of several controls
What separates it Silence with the volume apparently up, where the accessory has its own volume separate from the source.
How to confirm Many accessories keep an independent volume level. Raise both.
- 3
The audio format is not supported
What separates it Silence on specific content only, typically Dolby Atmos or DTS.
How to confirm Set the source's output to PCM or stereo as a test. If sound returns, the format was the problem.
Before you touch a setting
Record this first — changing settings destroys the evidence
Every item below stops existing the moment a reset, re-pair or settings change is made. Written down first, they are what separates the causes above; recovered afterwards, they are guesswork.
- Whether the accessory is selected as the audio output, as opposed to merely being connected.
- Whether silence affects everything or only specific content, which points at audio format.
- Which input a soundbar is set to.
- Whether a call application is running.
Select the accessory explicitly as the audio output
ReversibleConnection and routing are separate; a paired device can sit silent while audio goes elsewhere.
Raise the volume on both the source and the accessory
ReversibleMany accessories keep an independent volume level from the device driving them.
Set the source's audio output format to PCM or stereo as a test
ReversibleIf sound returns, a surround format was being sent that the accessory cannot decode.
Test with a different source device
ReversibleThis separates the accessory from the phone, computer or television driving it.
Model-specific
What is true of this model and not of its siblings
Generic advice for the product line fails here. Each item below is a property of this specific model family that changes which of the steps above apply to you.
- Model scope
- Era 100. Sonos product; Wi-Fi/Ethernet, Bluetooth, voice, home-theater and line-in capabilities vary.
- Type — mains WiFi stereo speaker
- A compact mains-powered WiFi speaker (stereo, not Atmos — that is the Era 300). Streams over WiFi via the Sonos app, plus Bluetooth and a USB-C line-in with an adapter. A pair can be rear surrounds for a soundbar.
- WiFi-first
- Primarily WiFi through the Sonos app; a missing speaker is usually a network issue. Bluetooth is a secondary direct option.
- Stereo pairing
- Two Era 100s can be grouped as a stereo pair (one left, one right) — if only one plays, check the pair grouping in the app before suspecting a fault.
- Symptom boundary
- This record covers Sonos Era 100 speaker when it connects but has no sound. A different symptom on the same hardware, or this symptom on a different Sonos product line, has its own record with its own causes and its own cited source.
Stop boundary
When this stops being a self-service repair
Continuing past any one of these costs more than the repair saves — in safety, in warranty, or in evidence a technician needs.
- !Stop for distortion accompanied by heat, or any burning smell.
Evidence ledger
Sources behind this answer
Visible sources support the visible claims. Home Product Support records the publisher, the fact used and the review date; community reports can suggest an issue but do not become a published fact on their own.
Where the manufacturer's article stops. Sonos publishes this as "Sonos home theater product does not output sound". Sonos' direct no-audio path for a home-theater product that is connected but silent. Probed 2026-08-21: title-verified. What that article does not carry is the model boundary — it is written for a product line, and Era 100 is the scope applied here. Where a control label, terminal, indicator pattern or reset sequence differs on your unit, the manual for that exact model is the authority, not this page and not the article.
Exact questions
Common follow-ups
Only one of my paired Sonos Era 100s is playing.+
When two are bonded as a stereo pair, one plays the left channel and the other the right, so a mono source or one speaker dropping off WiFi leaves a single side. Check both are grouped as a stereo pair and online in the Sonos app, and test with a stereo track. If one keeps disappearing, it is a WiFi/network issue for that unit rather than a speaker fault.
It says connected but there's no sound.+
Connecting and being selected as the output are two different things, and a device can be connected while audio continues to play elsewhere. Open the sound output settings and select the accessory explicitly. If that is already right, set the source's audio format to PCM or stereo as a test — silence on specific content only is almost always a surround format the accessory cannot decode.
Does this answer apply to every Sonos model?+
No. It is scoped to Era 100. Sonos product; Wi-Fi/Ethernet, Bluetooth, voice, home-theater and line-in capabilities vary.
What should I record before troubleshooting no sound or connected?+
Record the complete model identifier, exact message or indicator, software/firmware where visible, the operating stage and what still works.
Why is a factory reset not the first step?+
A reset can erase accounts, networks, maps, schedules or preferences without distinguishing no sound, connected. The ordered checks preserve that evidence.
When should I stop and use qualified service?+
Stop for electrical noise, heat, sparks or severe distortion.
Answer for the exact device and software version shown above.