Netatmo
Underheating / Insufficient Heat Output
Room never reaches the set temperature; heating seems too weak even though the thermostat is calling for heat.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Incorrect boiler power or flow temperature settings, Closed or mis‑calibrated Smart Radiator Valves, Thermostat installed in unusually cold location, Boiler not responding fully to on/off signal
How to Fix / Troubleshooting
Danger: Adjusting boiler internal settings should be done carefully; consult the boiler manual or a technician.
- Check radiator valves: Ensure all manual valves are open and Smart Radiator Valves are calibrated and not set to low setpoints.
- Verify thermostat location: Avoid placing the thermostat in the coldest part of the house (e.g., unheated hallway) if other rooms are used as reference.
- Check boiler settings: Increase the boiler’s flow temperature or heating curve slightly according to its manual, ensuring you stay within safe limits.
- Confirm boiler run time: In the app, verify that the thermostat is indeed calling for heat for long enough periods. If calls are short and frequent, adjust cycle settings if available.
If rooms remain cold despite long boiler run times and open valves, a boiler or hydraulic issue is likely; contact a heating professional.
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Repair Difficulty
Medium
3/5
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