the boiler is indicating faulty pump,or low pressure.the pump is running and there is 1.5 bar pressure.your can hear the boiler running but shes not firing.anybody got an idea

sean kiely, August 2010

Thank you Care free. I checked the flow valve diaphram and it is the problem as you sugested. Thanks a million. Frank

Frank, August 2010

I have exactly the same problem with the same sympton. ie 60 degree alarm lit but pump appears to run and there is adequate system pressure.

Frank, August 2010

thanks for the valuable info carefree,done what you said,rod didnt move,so made the switch and away she went.so what i need to do is replace the diaphram.thanks a million

sean kiely, August 2010

Hydraulic Differential Pressure Sensor (Pump flow sensor).
Either the diaphragm or microswitch is fauly, suspect the diaphragm.

Located bottom left of the boiler, turn on the boiler (pump running), physically watch for the microswitch to be made by push rod, if not, make the switch manually, if boiler fires, you have your answer.

Carefree, August 2010