Potterton Profile 100E thermostat

[HillCrest]

My boiler had stopped and the central heating cooled down whilst I was out. It had been left on, there were no changes in settings and no new parts fitted recently. I checked the reset button, but it hadn't tripped. When I turned the boiler thermostat to 0 the boiler fired up. When I turned the boiler thermostat back up the boiler turned off. I've left it working on 0 at the moment, but would like to know if anyone's come across this before?

 

[Soggy_weetabix]

Yes,

Complicated fault that caused it though.

Even though "it is not possible for this fault to occur", - (pott technical) a pcb fault was diagnosed and repaired.

Dvaid

 

[HarrogateGas]

Ive come across this problem about 6 times now. Its the boiler thermostat thats faulty. The swtiching inside falls to bits. A new boiler stat is required.

 

[alanwfrogmoor]

What was the source of the problem I have exactly the same here. You appear to have either the pcb or the thermostat.

Thanks

 

[justonepost]

I had exactly the same symptoms as the original post - it was the boiler thermostat - part number 907729

If you have a potterton boiler that takes along time to fire though, then it's more than likely the PCB see here: http://kaijaks.co.uk/blog/nick/2008/02/10/dodgy-old-boiler

 

[Agile]

The boiler stat is so easy to test for continuity with a meter and with the boiler warm and power disconnected.

I dont see why so much discussion is needed.

The stat has to operate its contacts perhaps 200-300 times a day during the heating season. So its not surprising that it may sometimes fail when the boilers over 10 years old!

Tony