Hello. Got a Baxi Solo 3 (60 PF) conventional gas boiler running an S Plan system. When system is up to temperature, boiler main burner (and pilot) keeps dropping out and then re-igniting again straight away. Not a serious problem at the mo but is getting worse and I want to fix it before if fails completely. Fault sequence is:
System calls for heat; boiler runs normally (during warm up from cold) with boiler, fan, pilot, and burner LED's on; then main burner drops out and burner and pilot LED's go off; soleniod(s) click; pilot and burner LED's come on and main burner fires. It all takes about a second and happens constantly until boiler shuts off on internal thermostat (as normal). When stat switches boiler on again, faulty sequence re-occurs. The fan never stops running. Obviously all external system controls are ok.
Fault finding flowchart in back of servicing manual isn't much help 'cos it's not a solid fault. Calls most of the expensive bits, depending on which leg you take, pilot, burner, etc.
My hunch is one of the soleniods on the gas valve but would appreciate any advice, inc. if it is a soleniod, can they be cleaned/repaired, or do they have to be replaced?
Boiler history is: installed 5 years ago; replaced pcb 3 years ago (pump running constantly); replaced a.p.s and tube last year; regularly serviced by corgi reg. eng.
Know I should use corgi guy again but; a) spent enough on this boiler already and don't want to get ripped off e.g. paying for whole gas valve when might just need soleniod and b) as an ex sparky, still 16th edition qualified, I'm quite capable of fitting any parts myself.
Thanks.
System calls for heat; boiler runs normally (during warm up from cold) with boiler, fan, pilot, and burner LED's on; then main burner drops out and burner and pilot LED's go off; soleniod(s) click; pilot and burner LED's come on and main burner fires. It all takes about a second and happens constantly until boiler shuts off on internal thermostat (as normal). When stat switches boiler on again, faulty sequence re-occurs. The fan never stops running. Obviously all external system controls are ok.
Fault finding flowchart in back of servicing manual isn't much help 'cos it's not a solid fault. Calls most of the expensive bits, depending on which leg you take, pilot, burner, etc.
My hunch is one of the soleniods on the gas valve but would appreciate any advice, inc. if it is a soleniod, can they be cleaned/repaired, or do they have to be replaced?
Boiler history is: installed 5 years ago; replaced pcb 3 years ago (pump running constantly); replaced a.p.s and tube last year; regularly serviced by corgi reg. eng.
Know I should use corgi guy again but; a) spent enough on this boiler already and don't want to get ripped off e.g. paying for whole gas valve when might just need soleniod and b) as an ex sparky, still 16th edition qualified, I'm quite capable of fitting any parts myself.
Thanks.
