Halstead Quattro burner probem

[mrogers]

Hello, Can any one please help.

This evening my halstead quattro combi boiler has stopped working.

When it is turned on the pump runs, the fan runs then the green burner light comes on for a couple of seconds but the gas doesn't fire up. When I reset it there is a clicking sound made from the gas inlet and the same procedure happens. I have checked and one of the ignitors comes on for a few seconds. After this the gas inlet shuts off.

 

[Rob]

Can you be clearer on what happens. You say it doesnt fire up but one of the ignitors comes on? Whats an ignitor?

 

[mrogers]

Sorry Rob,

I'm a spark so dont know the proper terms. It's one of the probes that generates a spark inside the burner part.

I apologize for my poor vocabulary with all thing relating to gas burners!

 

[Rob]

So it sparks but doesnt fire up..

Firstly is there gas on in the property check cooker etc. If so we can only assume its getting to the boiler.

Once confirmed is there 240v at gas valve. Could measure solenoid resistances aswell.

Not alot esle to check without getting into Corgi/gas territory..

 

[mrogers]

There is definitely gas coming into the boiler. The solenoid is measuring about 114 ohms which I assume is ok. It's a 24vdc solenoid. I'm not getting any voltage at the solenoid.

Is there any way to prove the solenoid or am I know into the regions of someone calling someone who isn't likely to blow the house up

 

[Agile]

Is there a resettable o/h stat in series with the gas valve solenoid?

Tony

 

[mrogers]

Not sure, what does it look like

 

[Rob]

Its a button on the top of your boiler

 

[mrogers]

There is one at the top hidden away. This is ok. There is 9 v at the gas valve solenoid. I cant see this being a problem.
As it stopped working there was heavy rain outside. Is this a possibility or am I showing my ignorance

 

[Agile]

9v will not operate a 24 v solenoid.

That might indicate a PCB problem.

Have you measured the contact resistance of the o/h stat?

Tony

 

[ChrisR]

There is 9 v at the gas valve solenoid. I cant see this being a problem.

Dirty relay contacts?

 

[mrogers]

Dear all.

have now fixed the problem, it was a faulty gas inlet valve. As soon as this was replaced it all worked fantasticaly

Thanks for the replys steering me in the right direction