Hello, I wonder if anybody could give me a bit of advice, my Modena is 10 years old and has been giving a little trouble recently, locking out when DHW is turned on.
Yesterday it has developed a new fault, DHW is working fine, but when CH tries to light it is going through the motions, ie pump, fan APS, igniter, flame but approx 1 second later it shuts down, and keeps repeating the firing sequence over and over.
I have tried swapping the thermistor wires over but doesn't make any difference, the fault doesn't change to DHW.
I can't see what the difference is between firing up in CH or in DHW. I cannot check minimum gas pressure properly because boiler does not fire for long enough.
Any help appreciated, from experience with these boilers,they are a little troublesome and some combi engineers are reluctant to get involved.
Yesterday it has developed a new fault, DHW is working fine, but when CH tries to light it is going through the motions, ie pump, fan APS, igniter, flame but approx 1 second later it shuts down, and keeps repeating the firing sequence over and over.
I have tried swapping the thermistor wires over but doesn't make any difference, the fault doesn't change to DHW.
I can't see what the difference is between firing up in CH or in DHW. I cannot check minimum gas pressure properly because boiler does not fire for long enough.
Any help appreciated, from experience with these boilers,they are a little troublesome and some combi engineers are reluctant to get involved.