Keston C36 Combi boiler.

[rodders09]

Hi Guys.

I've got a problem with the boiler mentioned above.

Everytime I run the water or heating I get banging noises, Inspected it and found out that the prv is opening up, due to overheating. I initially thought it was a blockage on the central heating circuit.

I was wrong. double checked again and found scale mark around pump and diverter valve. checked to see if I was getting power to pump that was ok. Took the screw cap off from pump and stuck screw driver in there but it was not spinning.

I'm I going in the correct direction or should I check other things.

I want to make sure that I'm 100% is the modulating pump not circulating.

As you know Keston spare are very expensive.

Your help will be much appreciated as before.

Regards

Andy

GS 306372

 

[aggis]

Hi
Have you checked if there is power to pump, 1. permanent live. 2. speed control live.
Whenheating or dhw calling fan should run & speed control should supply a voltage reading to pump.
if in doubt call Keston
+44 (0)20 8462 0262

 

[rodders09]

Thanks for the advice. I'll call them tomorrow when im on site.

 

[oldplumber]

check expansion vessel as well, failed pump can cause expn vssl to give up as well as I discovered recently , replaced expn vessel and still had over pressure due to seized pump (grunfoss, took it apart, cleaned it up and its still working ok to my knowledge)