My son has an inherited Ariston A/23 combi, full new system looks to be about 2 yrs old.
Spark generator gets no supply when it won't light (240 Volt), and after a few seconds lock-out lamp comes on, when it does ignite it gets about 136 volts ac. Tested everything I can think of. Fan and venturi OK air switch operates gas valve opens but not always a spark when I say spark I know it's not the generator as I have volt meter across it's input-no volts,well 2 or 3v ac
If I put a big screwdriver on the pump and bang with my hand the vibration through boiler makes the generator spark and hey presto all ok, on CH gas valve modulates as reaches temp, and burner goes off when it want's to re-ignite most of time it's as above needs a gentle tap (pardon the pun)
Fan runs ok, air switch does operate every time, gas valve operates every time but obviously when no flame detected lock out comes on.
The flow reed switch closes every time even when it won't ignite. Pump is free but i've felt better, can't be pump as it wont even light when stone cold, so not an overheat,and as I said reed switch closes every time. Any thoughts, I'm a domestic appliance engineer hence no stranger to fault finding, just need to know any quirks re fire up sequence I may have missed
Thanks in advance
Spark generator gets no supply when it won't light (240 Volt), and after a few seconds lock-out lamp comes on, when it does ignite it gets about 136 volts ac. Tested everything I can think of. Fan and venturi OK air switch operates gas valve opens but not always a spark when I say spark I know it's not the generator as I have volt meter across it's input-no volts,well 2 or 3v ac
If I put a big screwdriver on the pump and bang with my hand the vibration through boiler makes the generator spark and hey presto all ok, on CH gas valve modulates as reaches temp, and burner goes off when it want's to re-ignite most of time it's as above needs a gentle tap (pardon the pun)
Fan runs ok, air switch does operate every time, gas valve operates every time but obviously when no flame detected lock out comes on.
The flow reed switch closes every time even when it won't ignite. Pump is free but i've felt better, can't be pump as it wont even light when stone cold, so not an overheat,and as I said reed switch closes every time. Any thoughts, I'm a domestic appliance engineer hence no stranger to fault finding, just need to know any quirks re fire up sequence I may have missed
Thanks in advance