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Will fire when gas chamber is open, won't when closed but ignition will cycle and sometimes the pilot will fire but not the burner Have tried the gas valve which didn't help. I originally thought the fan but it surely cant if its proving to the APS and thus the ignition is cycling? I am a...

Hi I have a Baxi 105 condensing boiler, 3 years old, and it will not fire unless the case seal is off. Is this an APS related problem? Thanks in advance