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Start by diconnecting main supply to Boiler (at the boiler input) and see if it trips the electric. This would point to fault in wiring from board to boiler.
Then check several points with meter to find short-circuit.
If not, then you have to TURN OFF THE GAS SUPPLY and connect and disconnect items such as solenoids, switches, board etc; until you find what causes it to trip.
Printed Circuit Boards are the 'brain' of the boiler. They control every action and can be found in most appliances from boilers to warm air units and fires. They are often referred to as a PCB, control box, mother board, driver board, sequence board, ignition board or power board. For more info you can visit at http://dferrantielectronics.co.uk/ Contract Electronic Assembly Manufacturer
Generally a control module won't diagnose that it is bad. The fan switching in heat mode occurs via timer in the board. So either run the fan on all the time from the thermostat, or replace the control module.
Double check your wiring on the new board, you may need to jump your thermostat line to the "R" terminal on the ignition controller. There are two sides on the ignition controller. One is for line voltage (115-120) and the other is for low voltage (24). Be sure of these connections and it should be good to go.
Check transformer near on on boiler circuit board. the transformer provides a low voltage power source to operate some thermostats and relays at the furnance control board. May need new transformer also check wiring to thermostat
When the fan stops working it also stops the boiler. Safety. Check that the fan is turning and blowing air out. You can hear it turning at the top of the boiler and at the vent pipe exit. With the electrics off, remove front cover and test the fan by moving the blades by hand. Any element of stiffness or jerking or if the fan does not turn freely - replace. These have an induction motor - no repair Check the electrical contact wires to fan are ok. If the fan is ok check also the 2 plastic tubes to & from the air pressure unit [usually close to one side of the fan] are intact [no splits or holes and will maintain pressure and vacuum] and fully connected to their metal terminals. Next is to examine the pcb (the electronic board behind the switches) Look for any block connections loose and any obvious signs of black marks on the board. If the latter, replace
Prior to writing the above fault I had asked the owner to turn the boiler temp controller , for the heating side, down just a fraction . I was phoned this morning to tell me that the boiler had stayed on allnight with no fault light . After consulting with the plumber who fitted the system it appears that there might not be a room stat ,
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