I am getting a chattering noise from the PCB area. This happens when the boiler has reached temp on either C/H or water. After the boiler switches off it will be ok for maybe 20 mins then the noise starts up. If I switch off the boiler at the stat the noise is still there. The only way to stop it is turn the power off at the switch. Would welcome any sensible suggestions.
I am a retired domestic appliance engineer (Bosch, Neff & Siemens).
I am a retired domestic appliance engineer (Bosch, Neff & Siemens).