Hi, I have A Myson Apollo 30si boiler, which is now failing to ignite totally. It would run for a time then turn it's self off, begin arcing and call for gas, after three or four minutes it would ignite and run for ten minutes warming the system and then go through the whole process again. A new fan has been fitted as the bearings were failing, and thinking the fan was not creating enough pressure to activate the pressure switch, was replaced. Since the fan was replaced the boiler will not ignite at all. It still arcs and calls for gas but does not light at all. Power is passing across the pressure switch, but the gas valves don't seem to be energizing.
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DaveA
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DaveA