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Does that mean a new board or can it be repaired or cleaned

he checked the gas valve that was ok, the fault seems electrical, it clicks constantly like its a bad connection, the pilot light goes out and the fan stops, excuse my naivety but i dont want to spend any unnecessary money on this in view of what it has cost me so far. Might add it does this...

can anyone help i have a worcester bosch 24i rsf combi boiler, i have recently replaced the fan, timer, air flow switch and at first the problem seemed sorted, now it works when it wants to. The hot water will sometimes get hot for a few minutes then run cold. The boiler is constantly clicking...