boiler ignites itself Help and information on all topics relating to your central heating, air conditioning and ventilation issues.

[allan.byrne]

my boiler switches on even though Water/C.H are not called for.

[sparx]

give some more info. please....
type of boiler ie Combi / floor standing conventional, type of controls Ie 2 X 2port v/vs or 1 X three port v/v,
type of controls Ie inbuilt / remote programmer,
thermostats,
possibilities endless without knowing

[allan.byrne]

[quote="sparx"]give some more info. please....
type of boiler ie Combi / floor standing conventional, type of controls Ie 2 X 2port v/vs or 1 X three port v/v,
type of controls Ie inbuilt / remote programmer,
thermostats,
possibilities endless without knowing[/quote]

[allan.byrne]

I have a 'Baxi solo 2'boiler pumped system for domestic hot water/C.H .There is a remote timer control sw (off/twice/once/on), a 3 port valve, a room stat, cylinder stat, fost stat & the boiler thermostat has a pump overrun pcb. The room stat & diverter valve seem to work ok.

[sparx]

one thing to check if you have the means is at the wiring centre where everything joins together.
the orange wire from the 3port valve is what 'calls' the boiler and pump, when boiler next running when programmer says of see if orange is live, if so either valve u/s or problem with programmer most likely.
If orange wire not live then boiler pcb fault most likely as for pump overrun to work boiler will have live available permanently so fault in blr. can cause prob.
If not happy to carry out live testing get your self a friendly leckie.
regards Sparx
(sorry for delayed answer been in hospital)
SPARX