I have a Potterton Suprima 80 which in the past has had all the usual
lockout problems. I bought a replacement PCB from CET Ltd a couple of
years ago and have had no problems since, until now. However, what I'm
now seeing is different from the lockout problem I had previously.
The most common symptom now is that the thermostat will call for heat,
the LED will flash green and the boiler will light as normal. However,
after only a few seconds it will switch off again and the LED will
revert to solid red. If I keep cycling the thermostat down then up to
cause it try again it will eventually stay lit for a while (normally).
Sometimes though, no matter what I do with the thermostat or power
cycling the boiler etc it won't even try to light - the LED will remain
resolutely solid red.
So, do you think that the PCB is playing up again, or are there other
things I should investigate before ordering a new one? I don't know if
it's relevant or just sod's law, but it is worse when the outside
temperature is particularly cold (contraction of dodgy solder joints?).
- posted 12 years ago