- HVAC
- Smart thermostats
CALIBRACION-FALLIDA
Netatmo Valve CALIBRACION-FALLIDA: calibration has failed
Risk level
Low
Usually safe to check without specialist tools.
Urgency
Medium
Quick answer
The ‘Calibration has failed’ error in the Netatmo Energy app (with a ‘!’ on the Smart Radiator Valve screen) means the motor could not complete its stroke on the valve pin; check the adaptor, test and lubricate the radiator piston, and run Calibrate the valve in the app.
Safety first
Stop and check this first
- Never use a clamp or pliers to screw the Netatmo adaptor onto the radiator or the Smart Radiator Valve onto the adaptor; tighten them firmly by hand only.
- Only unscrew the electronic Smart Radiator Valve head itself; never unscrew the brass hydraulic valve body from the radiator pipework yourself, as it holds pressurized hot heating water.
Safe checks you can perform
- Dismantle the Radiator Valve and inspect and lubricate the valve body piston
- Verify the matching Netatmo adaptor is hand-tightened and check for the motor cap alert
- Check the battery cover metal strip, reset batteries for 1 minute, and run Calibrate the valve
Leave these tasks to a qualified professional
- Do not attempt this professional task: Submit a support request to Netatmo if the ‘!’ follows the Valve to another radiator
- Do not attempt this professional task: Have a heating engineer replace a faulty radiator valve body or service the hot water circuit
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.
Submit a support request to Netatmo if the ‘!’ follows the Valve to another radiator
What they doNetatmo support handles repair or replacement when the battery door metal strip is damaged or when the Smart Radiator Valve still shows ‘!’ on a known-good radiator.
They must show youthe cross test outcome across both radiators and the condition of the metal conductive strip inside the battery cover.
In writingthe Netatmo Help Center ticket number, the Smart Radiator Valve serial number or MAC address, and the warranty service decision.
Have a heating engineer replace a faulty radiator valve body or service the hot water circuit
What they doA heating engineer replaces a rusty or seized radiator valve body and checks hot water circuit pressure, water flow rate, bleeding, desludging, and descaling.
They must show yousmooth stop-to-stop travel on the new or serviced radiator valve body piston and hot water circuit pressure and flow rate within standards.
In writingthe heating engineer's service report detailing the valve body replacement or circuit bleeding, desludging, and descaling performed.
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.
Dismantle the Radiator Valve and inspect and lubricate the valve body piston
- Who:
- you, unscrewing only the electronic Smart Radiator Valve head.
- How:
- dismantle the Radiator Valve and inspect the radiator valve body visually for rust or oxidation; press the valve body piston gently but firmly when the radiator is on to verify smooth travel from stop to stop, and lubricate it with silicone grease.
- Result that matters:
- confirm that the radiator valve body pin moves freely between stops without leaks or hard spots.
- If the piston moves smoothly after applying silicone grease:
- proceed to check the adaptor and recalibrate.
- If the valve body shows rust, leaks, or remains seized:
- have a heating engineer replace the radiator valve body.
- Evidence to keep:
- photo of the radiator valve body condition and piston travel test.
Low: unscrew only the electronic Smart Radiator Valve head and never the hydraulic valve body on the pipe.
Evidence: The app is showing the error 'Calibration has failed'. What should I do? · My Radiator Valve only shows a ! on the screen and doesn't work, what do I do?
Verify the matching Netatmo adaptor is hand-tightened and check for the motor cap alert
- Who:
- you, checking the adaptor on the radiator and the Netatmo adaptor bag.
- How:
- confirm you installed the matching Netatmo adaptor (out of the 11 supplied) and that both the adaptor and the Valve are screwed on securely by hand without using a clamp; if the Energy app alerts you that the piston is too short, stick the optional motor cap onto the black piston of the Valve.
- Result that matters:
- ensure proper mechanical alignment and stroke reach between the Valve motor and radiator pin.
- If the adaptor and Valve are properly seated by hand:
- trigger manual calibration in the app.
- If the Valve still shows ‘!’ after checking the adaptor:
- inspect the battery cover strip and batteries next.
- Evidence to keep:
- photo of the hand-tightened adaptor and optional black motor cap if fitted.
Evidence: The app is showing the error 'Calibration has failed'. What should I do?
Check the battery cover metal strip, reset batteries for 1 minute, and run Calibrate the valve
- Who:
- you, inspecting the battery cover and using the Netatmo Energy app.
- How:
- make sure the metal adhesive strip inside the battery cover is flat and undamaged; remove the batteries for 1 minute and reinsert them (or install new non-rechargeable 1.5 V alkaline or 1.5 V lithium batteries), then select Manage my home > Valve room name > Valve name > Calibrate the valve.
- Result that matters:
- hear the motor movement from the Valve and complete full stroke calibration.
- If calibration succeeds and the ‘Calibration has failed’ error disappears:
- normal temperature regulation resumes.
- If calibration fails again:
- run Netatmo's cross test by swapping this Valve with another working Valve to isolate the fault.
- Evidence to keep:
- screenshot of the app after calibration and the result of the cross test across two radiators.
Evidence: The app is showing the error 'Calibration has failed'. What should I do? · My Radiator Valve only shows a ! on the screen and doesn't work, what do I do?
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
- Netatmo
- Product type
- Smart thermostats
Known code variants
- Calibración fallida
- Calibration has failed
- Error de calibración Válvula Inteligente Netatmo
- La aplicación Netatmo Energía muestra el error Calibración fallida
- Mi Válvula muestra solo un ! y no funciona
- My Radiator Valve only shows a ! on the screen
- Netatmo Smart Radiator Valve calibration error
- The app is showing the error Calibration has failed
What it means
In Netatmo's official Help Center articles for the Smart Radiator Valve (Netatmo wall Smart Thermostats use different displays and relays), an uncalibrated Valve stays 100% open, stops regulating temperature, blocks Manual Boost, and shows ‘!’ on screen; after 3 consecutive failed calibrations, it shows only ‘!’ and becomes unreachable. Replacing batteries clears calibration until it recalibrates within an hour. Seeing this error alone never proves that the Valve is faulty: it usually points to an unsuitable or clamped adaptor, a stiff or rusty valve body piston, a short pin needing the motor cap, or weak batteries.
Warnings and stop conditions
- Mediumeditorial warning
Never use a clamp or pliers to screw the Netatmo adaptor onto the radiator or the Smart Radiator Valve onto the adaptor; tighten them firmly by hand only.
Evidence: The app is showing the error 'Calibration has failed'. What should I do?
- Mediumeditorial warning
Only unscrew the electronic Smart Radiator Valve head itself; never unscrew the brass hydraulic valve body from the radiator pipework yourself, as it holds pressurized hot heating water.
Evidence: My Radiator Valve only shows a ! on the screen and doesn't work, what do I do?
Symptoms and causes
Probable causes · in order
- Recent battery replacement awaiting automatic or manual calibrationCommon
When you replace a Smart Radiator Valve's batteries, it loses its calibration and displays a calibration error until it recalibrates automatically within an hour or manually from the app.
Evidence: The app is showing the error 'Calibration has failed'. What should I do?
- Stiff, seized, or oxidised radiator valve body pistonCommon
A radiator valve body piston with hard spots, an uneven stroke, or rust from a leak prevents the motor from reaching its stops and locks out calibration after 3 failed attempts.
Evidence: The app is showing the error 'Calibration has failed'. What should I do? · My Radiator Valve only shows a ! on the screen and doesn't work, what do I do?
- Incorrect Netatmo adaptor, clamped mounting, or missing optional motor capPossible
Using the wrong adaptor out of the 11 supplied, tightening the adaptor or Valve with a clamp, or having a short valve pin without sticking on the optional black motor cap causes calibration to fail.
Evidence: The app is showing the error 'Calibration has failed'. What should I do?
- Damaged battery cover metal adhesive strip or depleted 1.5 V batteriesPossible
If the conductive metal adhesive tape inside the battery cover is bent or peeled, or if the 1.5 V non-rechargeable batteries drop voltage under motor load, calibration fails.
Evidence: My Radiator Valve only shows a ! on the screen and doesn't work, what do I do?
Virtual technician
Does CALIBRACION-FALLIDA 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
The app is showing the error 'Calibration has failed'. What should I do?
Netatmo · 2026 · official_doc
- 2
La aplicación Netatmo Energía muestra el error «Calibración fallida», ¿qué hago?
Netatmo · 2026 · official_doc
- 3
My Radiator Valve only shows a ! on the screen and doesn't work, what do I do?
Netatmo · 2026 · official_doc
- 4
Mi Válvula muestra solo un ! y no funciona, ¿qué hago?
Netatmo · 2026 · official_doc
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