My condensing boiler is about three years old and I have my suspicions as to what is wrong, but wanted to air the symptoms here, so I can decide on who to call to repair it.
I am an engineer, so am quite good at testing electrical parts but realise that the gas bits need to be done by a qualified person. Unfortunately my installer is qualified, but does not do repairs or servicing.
The boiler operates but frequently 'locks out' either on the burner, the fan or something else - especially when the lower white panel is on the casing. It does not show error lights when this panel is removed. Sometimes it is noticed that the pump is running, heat being called for but the ignition does not attempt to fire. No warning lights (except mains on). A reset of the button, starts the boiler firing.
The thermostat control (high to low) appears to do nothing. The boiler runs at low speed only - does not modulate to a higher speed/power. Outside, the flue is not piping out gases as fast as it used to - more like a trickle.
Have tested the two fan and flow sensors (black) and they measure low ohms. The red thermister reads about 4.5k.
The condensate trap contacts are open cct, I think. The condensate trap is difficult to see what is happening but looks like the left chamber is half full and the r.h. chamber is empty. There appears to be deposits resembling a pile of iron filings above the drain cock position.
Can anyone confirm my suspicions?
Thanks in advance.
Ian King
I am an engineer, so am quite good at testing electrical parts but realise that the gas bits need to be done by a qualified person. Unfortunately my installer is qualified, but does not do repairs or servicing.
The boiler operates but frequently 'locks out' either on the burner, the fan or something else - especially when the lower white panel is on the casing. It does not show error lights when this panel is removed. Sometimes it is noticed that the pump is running, heat being called for but the ignition does not attempt to fire. No warning lights (except mains on). A reset of the button, starts the boiler firing.
The thermostat control (high to low) appears to do nothing. The boiler runs at low speed only - does not modulate to a higher speed/power. Outside, the flue is not piping out gases as fast as it used to - more like a trickle.
Have tested the two fan and flow sensors (black) and they measure low ohms. The red thermister reads about 4.5k.
The condensate trap contacts are open cct, I think. The condensate trap is difficult to see what is happening but looks like the left chamber is half full and the r.h. chamber is empty. There appears to be deposits resembling a pile of iron filings above the drain cock position.
Can anyone confirm my suspicions?
Thanks in advance.
Ian King
