Plumbing Questions? Ask a Plumber for Answers ASAP
Where are you hearing the click, is it from within the boiler as this suggests its getting a call for heat as the click is a relay.
It could be the frost protection thermostat, I assume its just the pump circulating CH which runs, the boiler doesnt fire up, unless the timer or thermostat calls for heat?
Click suggests the boiler is getting a call for heat then as thats the relay within the PCB you hear click.
To me this suggests a faulty PCB, or frost thermostat, the boiler is still within warrenty so would call out the engineer who fitted it and get them to check the thermostat is open circuit when the fault is present, if it isnt then replace that, if it is, check the call for heat from the timer is open circuit, if that is then change the PCB if it isnt change the timer.
I havent heard from you in a while I just wanted to check in to see how you got on and if you need any further assistance.