gloworm ultimate No Ignition

[justdave]

Can anyone help with this problem.Intermittently my boiler fails to ignite,the fan starts up,the igniter sparks but not gas appears to be present at the pilot.I have cleaned the pilot tube,and I have changed the pcb and checked all connections but to no avail.Any help would be much appreciated.

 

[Agile]

You need to electricially check if the gas valve is being powered to move forward with diagnosing the problem.

Tony

 

[justdave]

Thanks for the reply.What voltage should I expect to see at the gas valve?

 

[ollski]

Thanks for the reply.What voltage should I expect to see at the gas valve?

240v ac iirc.

 

[justdave]

Looks as if the the pilot solenoid is duff.Does anybody know if I can purchase one seperately or is it an integral part of the gas valve?THANKS.

 

[meldrew's_mate]

As far as I know you have to buy the complete gas valve.

 

[geoff@cetltd]

Looks as if the the pilot solenoid is duff.Does anybody know if I can purchase one seperately or is it an integral part of the gas valve?THANKS.

I presume you do have 240 volts at the solenoid, but just check that the solenoid is open circuit before rushing ahead

 

[2face]

the solinoid can be purchased on its own but the whole valve is virtually the same price . there is is only a tenner in it .

 

[ollski]

Which one is it?, is it the one with two solenoids in a blue box at the back of the valve?. There are 3 different gas valves used on the ultimate.

 

[justdave]

I was having trouble trying to test for the 240 volts so I disconnected the 2 wires and did a resistance test across the solenoid.At first the solenoid appeared to be open circuit but after a while it looked ok.I reconnected the 2 wires and all is working fine for now!This fault is intermittent but could now possibly work for 6 to 8 weeks without problem.
The gas valve is the one with 2 solenoids Ie pilot and main burner and the 2 solenoids are under a blue cover.........Thanks all for your help so far...Dave