Potterton Netaheat Profile start up problem

[MikeHi]

Returned from holiday and Potterto Netaheat Profile boiler would not fire up.
To start with the fan started, pilot light solenoid went clunk, ignitor started to spark and pilot light lit but main burner did not. On closer inspection of the pilot light I noticed that the ignitor was still sparking.
Shut of boiler and attempted a restart. This time the fan again started, the solenoid clunked in but no spark and no pilot light.
I have the installation manual for the boiler as I installed it in 1990 although gas was connected by a CORGI fitter. Looking at the fault finder chart in the manual these symtoms indicate a faulty electronic control unit. Does this sound right?
Recently one of the solenoids has been making a buzzing sound which is more pronounced in very cold weather and as the gas feed pipe runs along an external wall I assume it is related to cold gas supply. Assume this is a gas valve solenoid problem. Can these solenoids be replaced without disconnecting the valve body itself?

 

[corgiman]

hope you didnt have the cover off when you were checking the pilot!!!!!

the pcb has died

 

[ChrisR]

Most likely pcb, but could be leads etc.
Now you've had the cover off you'll have to get your corgi back to check the case seal with a flue gas analyser.
If/when they leak these boilers pump carbon monoxide into the room.
That is a Bad Thing
Found two recently, can't remember how many I didn't check...

 

[corgiman]

Most likely pcb, but could be leads etc.
Now you've had the cover off you'll have to get your corgi back to check the case seal with a flue gas analyser.
If/when they leak these boilers pump carbon monoxide into the room.
That is a Bad Thing
Found two recently, can't remember how many I didn't check...

shiver

me too

 

[Rob]

Anyone got that link to all the pos pressure boilers ever made?

 

[corgiman]

Anyone got that link to all the pos pressure boilers ever made?

Its in CORGI domestic guide I am sure rob

 

[Rob]

thanks cm, will have a look

 

[corgiman]

thanks cm, will have a look

i am pretty sure they are near the back of it

sorry I am waaay too fat and lazy to get me own book



DOnt want to burn useless calories you know

 

[rossjamesparker]

I am having exactly the same problem. Did the OP here ever find out what the problem was - PCB or solenoids?

 

[Axel]

1600 views and only 8 posts so far...!?!