suprima 60 will not ignite

[leeophonic]

I have a potterton suprima 60 which has developed a fault. Initially no lights so I changed the fuse in the pcb (this was replaced 12 months ago)
and there are red and green lights.The boiler goes through the ignition sequence and there is sparking but appears to be no gas, after several attempts the boiler just flashes the red light and gives up.
Is it the gas valve or any other options?

 

[Baxi-Remeha]

could be the ignition lead shorting out, or gas valve failed...

 

[leeophonic]

The ignition sequence appears ok and have observed the sparking with the cover off, so would you suggest the valve, if so is it a major heartache.

 

[ChrisR]

If you tell us what voltage is being applied to the gas valve coils, and what the gv coil resistances are, we can help. If you can't measure those it's Corgi time.

 

[kevplumb]

The ignition sequence appears ok and have observed the sparking with the cover off,

naughty naughty

 

[geoff@cetltd]

IS the HT lead red ?

if so, cheapest first thing to try is replacing it

The HT lead also senses the flame

 

[Agile]

Hang on Geoff, he says its sparking but not igniting. So its not the lead.

It may well the the gas valve but that will often take out the PCB ( as Geoff well knows and contributes to the overestimated Olski's T/O figure ).

Tony

 

[geoff@cetltd]

Hang on Geoff, he says its sparking but not igniting. So its not the lead.

I was thinking that "igniting" meant that he could hear a clicking of the HT - not necessarily getting to the electrode.

and I'm sticking to that story

 

[leeophonic]

I have observed the boiler clicking and it sparks at the same time over the burners but with no success as there appears to be no gas for the spark to ignite.
You mention the gas valve will take out the pcb, would this have caused the fuse to blow in the first place?

 

[leeophonic]

Wife went to cook the tea and no gas!
I did a double take and realised that when I was messing with the boiler electrics I had the gas shut down.
So Gas on and boiler is back in business!
One pack of fuses from Maplin £1.99 and slight embarressment!

Thanks to all.

 

[Baxi-Remeha]

lol....been there done that got the tee shirt.....lol