Vaillant ecoTEC Exclusive - no heat required?

Joined
4 Jun 2020
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United Kingdom
Hi There,

After the few days of sun we've had, I came home to a chillier than usual house today.

Thermostat is lit up requesting heat, and the indicator light next to the boiler is lit, however according to the boiler, "no heat demand", and it's reading 75 degrees. Boiler is just shy of 4 years old.

Closest radiator to the boiler (room above) is slightly warm. All other radiators in the house are cold.

Hot water supply is fine.

Is there anything a complete novice can do, or is it time to call in some experts?
 
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