boiler ignites itself


Postby allan.byrne » Fri Apr 06, 2007 10:40 am

my boiler switches on even though Water/C.H are not called for.
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Postby sparx » Wed Apr 11, 2007 9:40 am

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
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Postby allan.byrne » Wed Apr 11, 2007 12:09 pm

[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]
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Postby allan.byrne » Thu Apr 12, 2007 8:42 am

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.
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Postby sparx » Thu Apr 19, 2007 9:43 pm

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)
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