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Thanks yet again picasso - I'm on the case.

Thanks picasso for that. Does that only affect the DHW and not the CH? Also is it an aesy job to change?

My boiler occasionally (but annoyingly more frequently) fails to ignite on DHW. It never fails on CH. It will sometimes go weeks without failing then will have a few weeks failing virtually every time on DHW. Only way to get hot water then is to turn on CH, then open tap and turn off CH at...