Hi all.
When switching on the CH the boiler lights up without any problems and runs until it reaches operating temperature.
Later on when the temperature in CH circuit goes down fan starts (fan light switches from amber to nothing within a second), ignition happens, combustion starts but after 5 seconds, combustion stops and restarts and like this on and off until the temperature is as expected.
DHW is fine it does not happen when asking for hot water and the temperature of hot water produced is good.
So far I have replaced thermistor on CH circuit but problem is still here.
Any ideas?
Thanks in advance for your time and advice.
PS: the boiler had his yearly service done last week by CORGI technician.
When switching on the CH the boiler lights up without any problems and runs until it reaches operating temperature.
Later on when the temperature in CH circuit goes down fan starts (fan light switches from amber to nothing within a second), ignition happens, combustion starts but after 5 seconds, combustion stops and restarts and like this on and off until the temperature is as expected.
DHW is fine it does not happen when asking for hot water and the temperature of hot water produced is good.
So far I have replaced thermistor on CH circuit but problem is still here.
Any ideas?
Thanks in advance for your time and advice.
PS: the boiler had his yearly service done last week by CORGI technician.