tado calling for heat with nothing happening: where the demand stops
A tado system can show a heat demand that never reaches the appliance. Learn which link in the chain carries the demand and how to find where it stops.
What this means
When a tado control shows a heat demand and the appliance stays cold, the demand is stopping somewhere between the two. The chain runs from the thermostat, through the radio link, to a receiver or extension kit, and finally through a pair of contacts into the boiler, and each of those can fail while the one before it reports success.
Equipment and model context
tado smart thermostat systems using a wireless receiver or an extension kit between the control and the heating appliance
- tado Smart Thermostat
- tado Wireless Receiver
- tado Extension Kit
- tado X
tado has shipped several generations with different radio arrangements, including the newer tado X range which is not wired or paired like its predecessors. Match the product names on the devices you actually own to the tado support material for that generation before following any instruction.
What you may notice
- The app or the thermostat shows a flame or heating indication while the appliance produces nothing.
- Radiators stay cold although the control believes heating is running.
- The appliance responds normally when operated from its own controls.
Likely causes
- The radio link between the thermostat and the receiver can be interrupted by distance, building fabric, or a device moved since installation.
- A receiver or extension kit can lose its supply, in which case it cannot close the contacts the appliance is watching.
- The contacts themselves can be wired to the wrong terminals on the appliance, which shows most often on a newly installed or reconfigured system.
Diagnostic paths
The appliance works from its own controls
Operating the boiler directly, or through any control other than tado, produces heat normally.
That clears the appliance and places the fault in the tado chain. Report that heat is available by another route, because it removes the heating engineer from the first conversation.
The receiver shows no indication at all
The receiver or extension kit near the appliance displays nothing, or its indicators are dark rather than showing a state.
A device with no indication has lost its supply, which is a wiring question at the appliance end rather than a radio or app question.
It began after the house was rearranged
The behaviour started after furniture was moved, an appliance was installed, or the thermostat itself was relocated to another room.
Note what moved and when. Radio links are affected by what sits between the devices, and a change nobody connected to heating is a real explanation.
However sophisticated the app is, the connection to the appliance is a pair of contacts closing, exactly as a mechanical thermostat did. Everything upstream decides when to close them, and nothing upstream can substitute for them.
- Schedule and demandDecided in software
- Radio messageSent to the receiver
- ContactsClose across the appliance terminals
- BurnerResponds to the closed contacts only
| Link | What carries the demand | How it fails |
|---|---|---|
| Room to thermostat | The measured temperature | A sensor or a placement problem |
| Thermostat to receiver | A radio message | Distance, fabric, or interference |
| Receiver to appliance | A pair of switched contacts | Supply, wiring, or terminal choice |
| Appliance response | Its own internal sequence | A heating fault, not a control one |
The simplest link is the one that gets skipped
It is easy to assume that a system with an app, a schedule, and geofencing must be failing in software. The connection that matters is far simpler: a pair of contacts closing across two terminals on the appliance. If those terminals are the wrong ones, or the receiver has no supply to close them with, no amount of correct behaviour upstream produces heat.
This is why an installation that never worked properly and one that stopped working are different problems. The first points at how the receiver was wired, the second at something that changed since, and the app reports both identically.
Proving the appliance first saves a visit
Before anything else, establish whether the heating appliance produces heat when asked by any route other than tado. Many boilers and system controls keep a way to run heating independently, and where one exists it answers the largest question in the chain in a couple of minutes.
Heat by another route means the appliance is sound and the conversation belongs with tado support or the installer. No heat by any route means the appliance is the subject, and a Gas Safe engineer is the right call rather than a connectivity investigation. Making that distinction before anyone is called out is worth a few minutes of an evening. The thermostat wiring explainer covers what a receiver actually connects to at the appliance end, and the tado radiator thermostat page covers the separate family of faults that appear on individual radiator valves rather than on the boiler connection.
What to give the technician
Say which tado devices you own, whether the appliance heats by another route, whether the receiver shows any indication, and what changed in the property before the fault began.
Safe homeowner checks
- Try to produce heat from the appliance or from any control other than tado, and note whether it works.
- Look at the receiver or extension kit and note whether it shows any indication at all.
- Write down anything that changed in the property recently, including furniture, appliances, routers, or a relocated thermostat.
Is a reset appropriate?
Restarting the app or the thermostat restores a software link and cannot close a contact that has no supply. Establish whether the appliance heats by another route before restarting anything.
When to call a technician
- Wiring between a receiver and a heating appliance carries mains voltage on United Kingdom installations, so terminal work belongs to a qualified person.
- An appliance that produces no heat by any route is a heating fault and needs a Gas Safe registered engineer rather than control support.
Questions people ask about this
Why does tado say heating is on when it is not?
The control reports its own demand rather than the appliance responding. A demand that never reaches the receiver, or a receiver that cannot close its contacts, leaves the app confidently describing heat that is not happening.
Is this a boiler fault or a tado fault?
Try producing heat by any route other than tado. Heat by another route clears the appliance and places the fault in the control chain; no heat by any route makes the appliance the subject.
Can moving furniture really stop my heating?
The link between a tado thermostat and its receiver is a radio path through the building. What sits between them affects it, and a change nobody associated with heating can interrupt the demand.
Evidence recordHow this page was checked
official manufacturer support article · checked 2026-09-15
Every technical claim above was written from primary documentation held in the HVAC Bench evidence record: tado technical literature. Where a source limits a definition to certain models, test conditions, or product classes, that limit is repeated here rather than generalised.
- Documentation class
- official manufacturer support article
- Scope of the definition
- tado smart thermostat systems using a wireless receiver or an extension kit between the control and the heating appliance
- Last checked
- 2026-09-15