What the manual says
Manufacturer manualCelcia 20 control override due to frost thermostat call for heat
From this model's manual
Verified against the Remeha/Remeha Avanta installation & service manual.
DIY fix possible
Check if the weather outside is particularly freezing, as this is a normal protective feature.Wait for the temperature to rise, at which point the message should clear on its own.Check your Celcia 20 room thermostat settings to ensure the frost protection temperature isn't set too high.
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