Don't combi boilers still have motorised valves in there somewhere? When my mum's CH got stuck on (despite any efforts with the thermostat, and albeit in a traditional non-combi boiler, open-vented Y-plan), it was the 3-port valve at fault and its microswitches stuck.
Ideal HE 30 Combi - central heating stuck on
- Thread starter grahamrex
- Start date
Some do some dont, all depends on the make and model, in this case though it is an external control fault
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