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Hi Update! I have discovered the problem and corrected it and now the boiler is working fine. The Control Knob Shaft for the CH Temperature Control Knob had snapped so the dial was totally ineffective. I replaced the shaft and increased the temperature and now the boiler is working...

Hi When the CH is on the boiler ignites then shuts down. No warning lights appear and the green light to the left remains at its normal flashing state. If I turn the thermostat down then up again, once it clicks, the boiler again fires up only to shut down after a few seconds. Without any...