R
rollie
Boiler is a Myson Classic V 23.5kW
Burner is a Inter 2011
Boiler PCB is a 25/0093/01 Issue 1
Controller in boiler has been replaced (TF830.3 Honeywell).
Burner attempts to start with spark generator going, fule valve opened, but motor for the blower and high pressure pump fails to start. Controller locks out after almost 1 min. Measured voltage to motor at the time and it's only 24V AC. Should be 240V. On removing 24V connect and applying 240V (link added) motor runs fine and drives blower and pump. If I syncronise the application of the 240V to the motor with the call for heat (spark gen and fuel valve open) boiler runs fine, until reaches upper thermostat temperature when fuel valve closes but as linked in 240V to motor it runs on and after 30 second I remove the 240V.
My question - what has failed to cause the 240V motor supply to drop to 24V? Am I right to suspect the boiler PCB? I have replaced the controller. Or should I check out the heating timer/programmer?
Any advice welcomed
Rollie
Burner is a Inter 2011
Boiler PCB is a 25/0093/01 Issue 1
Controller in boiler has been replaced (TF830.3 Honeywell).
Burner attempts to start with spark generator going, fule valve opened, but motor for the blower and high pressure pump fails to start. Controller locks out after almost 1 min. Measured voltage to motor at the time and it's only 24V AC. Should be 240V. On removing 24V connect and applying 240V (link added) motor runs fine and drives blower and pump. If I syncronise the application of the 240V to the motor with the call for heat (spark gen and fuel valve open) boiler runs fine, until reaches upper thermostat temperature when fuel valve closes but as linked in 240V to motor it runs on and after 30 second I remove the 240V.
My question - what has failed to cause the 240V motor supply to drop to 24V? Am I right to suspect the boiler PCB? I have replaced the controller. Or should I check out the heating timer/programmer?
Any advice welcomed
Rollie
