Potterton Suprima 50 not lighting

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My Potterton Suprima 50 fails to light after the ignition process starts the fan & activates the electrode spark. I measured 250v+ DC across the gas valve which, I believe, rules out the PCB.

I have been told it may be the gas valve solenoid, which would require the replacement of the complete gas valve. Could it just be a blockage in the injector?

Ironically, this occurs just 3 days after the CH comes on for the first time this year.

 

[gstens baxi]

The whole gas control will have to be exchanged if the gas valve is faulty. Does the burner light at all?

 

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No the burner doesnt light. The electrode sparks & runs through restart 3 times...

By 'gas control' do you mean the PCB as well? This is relatively new.

 

[gazthepottertonengineer]

no he just means gas valve which needs to be replaced by a corgi registered engineer as it will have to be set up for your paticular model ie 50 part number is 402550 i believe

 

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...& is there no likelihood of it being a simple/cheaper blockage?
The part being some £125.

 

[gazthepottertonengineer]

in a word no

 

[MANDATE]

Can't you check the solinoids for lack of continuity giving you the assurance you seek?

 

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Sounds a bit advanced for me. A CORGI job.

 

[MANDATE]

Well it seemed straight forward to me. 2 solinoids but built in the body of the valve. 3 terminal wires in line A, B and C.which can easily be removed (when power is off of course) and replaced . Continuity check using meter A to B and B to C. Or straight across A to C.
It proved to me one of the solinoids had failed so no point looking any further.

 

[broxy]

Sounds exactly what was wrong with mine 'gas valve kaput' get gazthepottyengineer out to it, comes highly recommended.

 

[gazthepottertonengineer]

Cheers Broxy

Cheques in the post

and i hope the neighbour moves out soon

 

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Thanks for that, Mandate.

 

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Had a look at the gas valve terminals. 5 pins. 1 & 2 labeled V1, 4 & 5 labeled V2. 1 is neutral, 3 is earth, 5 is live & 2&4 were linked.

Found no continuity in any combination.