105 instant intermittant heating

[Belle427]

The heating has become tempramental, it kicks in ok when i turn it on and the stat calls for heat but after a few hours will cut out and do nothing until i run a hot tap.
im guessing a valve is sticking but which is the likely culprit?

 

[Agile]

It could be several possibilities.

I would identify the problem by checking from in front of the boiler.

I suppose you want a list of parts to change?

Others will give you that but if you change something like an expensive PCB dont expect them to pay for it when it does not solve the problem. They are mostly anonymous anyway!

Thats why calling a pro isolates you from making expensive mistakes!

Tony

 

[Belle427]

im not intersested in a list of parts but thanks anyway. i will double check the lights on the front panel next time it happens

 

[Belle427]

the following happens when the heating stops.
power led illuminated, hot water led illuminated and temps 30,40,50 and 60 leds illuminated. pump running but burner not ignited.