- HVAC
- Smart thermostats
E4
tado° E4 on radiator thermostat: valve travel too short
Risk level
Low
Usually safe to check without specialist tools.
Urgency
Medium
Quick answer
A tado° radiator thermostat showing E4 measured too little distance between valve open and closed (on the Basic: warning, spanner and six dashes). It is often a calcified valve: move the pin several times, replace the batteries if it persists and recalibrate.
Safety first
Stop and check this first
- Removing or replacing the radiator valve body involves the heating circuit water: it is a job for a plumber or heating technician.
Safe checks you can perform
- Free the valve pin
- New batteries in the head with E4
- Adapter and pin extender with E4
Leave these tasks to a qualified professional
- Do not attempt this professional task: tado° support case for a persistent E4
- Do not attempt this professional task: Check the radiator valve after the head's E4
What a technician must be able to justify
Technician visit
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
tado° support case for a persistent E4
What they doIf calibration fails after several attempts, contact tado° via chat with a clear picture (pdf or jpg) of the thermostatic valve body so they can assess compatibility or replacement.
They must show youthe picture sent and the case number.
In writingtado°'s assessment of the valve or head and the agreed solution.
Check the radiator valve after the head's E4
What they doThe plumber or heating technician checks the valve pin moves in and out freely, that the bracket and adapter suit that valve body and, if they propose replacing the valve body or mechanism, backs it with the test.
They must show youthe pin moving by hand, the valve body model and calibration completed after the work.
In writingthe valve condition, what was replaced if anything and why.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Follow these steps
Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
Free the valve pin
- Who:
- you, with the head unmounted.
- How:
- use a spanner or similar tool to move the pin in and out several times, or refit the old valve head and open and close it several times. Then restart and mount the tado° head to recalibrate.
- Result that matters:
- whether calibration completes without E4.
- If it completes:
- scale was limiting the pin travel.
- If E4 stays:
- replace the head's batteries.
- Evidence to keep:
- photo of the valve and note of how many times you moved the pin.
Move the pin gently; don't strike or dismantle the valve body, as it holds the circuit water.
Evidence: My Smart Radiator Thermostat displays an E1, E2 or E4 error. How can I fix this?
New batteries in the head with E4
- Who:
- you.
- How:
- replace the head's batteries and repeat the restart and mounting to calibrate.
- Result that matters:
- whether calibration completes with new batteries.
- If it completes:
- low charge stopped it measuring the travel properly.
- If E4 stays after several attempts:
- contact tado° with a photo of the valve body.
- Evidence to keep:
- date of the battery change and photo of the display.
Evidence: My Smart Radiator Thermostat displays an E1, E2 or E4 error. How can I fix this?
Adapter and pin extender with E4
- Who:
- you.
- How:
- if you use an adapter between valve and head, check tado°'s adapter article for whether it needs the specific pin extender supplied in the box, and fit it if missing.
- Result that matters:
- whether your adapter needed the extender and it wasn't fitted.
- If it was missing:
- fit it and repeat calibration; E4 may have come from the motor not reaching the pin.
- If you use no adapter or it was fitted:
- E4 comes from the valve or the mounting.
- Evidence to keep:
- photo of the adapter and the pin extender.
Evidence: My Smart Radiator Thermostat displays an E1, E2 or E4 error. How can I fix this?
Still not solved
If the error persists, stop here. See what the technician must do and show you.
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- HVAC
- Brand
- tado°
- Product type
- Smart thermostats
Known code variants
- 4 flashes
- 4 parpadeos
- Aviso E4 de eje de la devanadora
- Bobbin winder shaft E4 warning
- Brother FS60x E4
- cabezal tado E4
- Candy lavadora E04
- Candy lavadora E4
- Candy washer 4 flashes
- Candy washer E4
- Candy washer too much foam E4
- Candy washing machine E04
- E 04
- E 4
- E-04
- E-4
- E04
- E4
- E4 message on the LCD
- Electrolux dishwasher E4
- Electrolux dishwasher error E4
- Electrolux EHFE14T6MSBUS E4
- Electrolux LL14X E4
- Error 04
- Error 4
- Error E4
- error E4 lavavajillas Electrolux
- error E4 tado calibración
- Fallo auto test dispositivo de seguridad
- Hoover E04
- Hoover E4
- Hoover washing machine E04
- Hoover washing machine E4
- lavadora Candy 4 parpadeos
- lavadora Candy mucha espuma E4
- lavadora Hoover E04
- lavadora Hoover E4
- Mensaje E4 en la pantalla LCD
- Safety mechanism self test fault
- Somfy Dexxo Pro E4
- tado Basic seis rayas llave inglesa
- tado Basic six dashes spanner
- tado E4
- tado E4 calibration error
- tado radiator thermostat E4
- tado Smart Radiator Thermostat E4
- tado° E4
What it means
tado° explains that E4 appears when the distance detected between the valve's open and closed positions is too short, and that it can indicate the radiator valve is blocked by calcification. If freeing the pin isn't enough, it lists low head batteries as another possible cause. The code measures valve travel: it doesn't prove the head is faulty or that the valve must be replaced.
Warnings and stop conditions
- Mediumeditorial warning
Removing or replacing the radiator valve body involves the heating circuit water: it is a job for a plumber or heating technician.
Evidence: My Smart Radiator Thermostat displays an E1, E2 or E4 error. How can I fix this?
Symptoms and causes
Probable causes · in order
- Calcified valve pinCommon
The pin moves little or stiffly because of scale. Fits if it improves after moving it several times.
Evidence: My Smart Radiator Thermostat displays an E1, E2 or E4 error. How can I fix this?
- Low head batteriesPossible
tado° says that if freeing the valve doesn't fix it, the batteries may be low.
Evidence: My Smart Radiator Thermostat displays an E1, E2 or E4 error. How can I fix this?
- Valve that won't recover its travelPossible
If it still fails after freeing and new batteries, tado° asks for a photo of the valve body to assess it.
Evidence: My Smart Radiator Thermostat displays an E1, E2 or E4 error. How can I fix this?
Virtual technician
Does E4 still appear after these checks?
Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.
Sources and technical references
- 1
My Smart Radiator Thermostat displays an E1, E2 or E4 error. How can I fix this?
tado° · 2024 · official_doc
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