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Just fitted a new servo valve and diaphragm due to hot water being poor. Central heating was fine. I then got it all running again, bled the system etc, but I have a problem with the CH. It will spark and fire up but only stay on for around 10-30secs then knock off. It will keep repeating...

I have an old Vaillant VCW GB 242 I developed no hot water unless I activated the servo switch manually, as a result I took it apart and have now fitted a new diaphragm as the old one was shot and also a new servo valve. Fine I thought, put it back together but the thing would not ignite...

Original problem 2mths ago was that the ch would heat up then cut out after 10-20secs whilst HW was fine. A new diaphragm and £130 for the 'privilege' and all was sorted. The reverse has now happened 2mths later with the hot water heating up then knocking back off after 10-15secs yet the...