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Baxi Combi Instant HE80 boiler?

Intermittent fault on the hot water. Sometimes it comes on but when it doesn't I can sometimes get it on by turning on another hot tap which fires up the boiler. No problem with the central heating. I've had a new diverter valve and new circuit board(?) but still have the problem.
Pat Mannakee, September 2017
Possibly the demand valve, which senses when hot water is needed.

ccsa, September 2017
link Click here to see other fixes for Baxi.