baxi solo always on with timer off or stat down.

21 Feb 2006
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United Kingdom
:confused: Any help.I have a baxi solo 2 40pf boiler.When i switch on the electrical suppy to the boiler it fires up even when the timer is off .Turning the thermostat up or down has no effect.
Any ideas? Thanks Pete
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Could be stuck microswitch on motorised valve. What (if any) motorised valve(s) do you have?
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Do you have a second motorised valve somewhere? Probably same type. Basically you need someone who's competent to carry out basic electrical checks and who can understand a simple circuit diagram. The Danfoss site may have the circuit diagram for your system, or see Honeywell S Plan (assuming you have 2 motorised valves). Also lots of other threads on this in this forum - try searching.

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