I have a baxi solo 50 boiler. The external contols appear to be working correctly and Hot water is fine.
There appears to be a problem when using the boiler for central heating - the boiler goes completely dead. None of the lights on the boiler, such as boiler on light work. There is power at the S/L input. I replaced the Potentiometer but this changed nothing.
Do you think that I need to replace the PCB? I am loathed to spend Â£100 to replace this if it could be some thing else.
For some weeks the 3 position diverter valve by the tank has been making a loud buzzing noise. Could this cause the problem?