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the heatexchangers and the saftey valve seem to be the weakest part of the boiler we have a componants bay were i can test the board ,but can i u link the water pressure switch as in by pass it to see if the boiler kicks in before i go to the board

thank you i wanted to work back from the board to erase any other problems before stripping the board at work,sorry for being rude,next year i will replace the boiler because they are rubbish.

well im afraid i did and it ran fine and saved me 700 pounds,i also rebuild fighter jets,so im not on here for a fight just advice so i will get the multi metre out and check the if its a solenoid on the board i will freeze each one find which it is then take it off and replace it from rs...

i have rebuilt this boiler before my friend put a heat exchanger in.the gas side i dont touch as i can only do hot and cold water,i also replaced the high limit thermostat and the heat refectors in the chamber last year,,asfor the fan i spun and dried it that was week ago

sorry ,as if its the pump siezed ,took pump off and its free movement.spins fine had water in chamber ,doesnt have no burning smells nether.the fan on top spins and i wd40 it.now rebuilding the boiler.so i was thinking it could only be down to the pcb board or could i test something else before...

my central heating system doesnt start up when you switch it on the fan and pump trys as the pressure drops a couple of bars and i have stripped the pump out and its not siezed,but there is a buzzing noise from the board as well and when you turn the system off the bars return to 1,5.the...