Potterton Promax FSB 30HE

[Stoney Ground]

Went to one of these this week boiler locked out.

Reset, and fired then dropped out 5 times to lockout.

Checked ignition sensing probes and cleaned, then all 3 cables slid out of porcelain.

Combustion door seal was brittle on bottom right.

Ordered spares and fitted replaced seals, fired up and FGA readings quite high, check gas rate and 33kW boiler is doing 40kW. Get back to boiler and burning smell and all 3 leads melting.

So need more spares and gas valve not adjustable, which means new GV. May replace combustion door as well.

Anyone else had issues with these.

 

[Aquazone]

Mate, I spend most of my day looking at these heaps - there's loads fitted round here....

Drop sump out of the bottom and check it's not full, and also check insulation pads at the back aren't deteriorated with the heat buildup. Also flue seal at the top of heat exchanger going onto turret break down sharpish causing high readings.