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baxi 105e instant?

DHW fires up and reaches 70 then cuts out and starts up again.Have changed diaphragms and plate heat exchanger also checked thermistors but still the same any ideas please
stumped, June 2012
Sounds like pcb fault!

Bob, June 2012
does it stay on with the front case off? if it does try air pressure switch

andy, June 2012
have you checked wires have voltage to the C.P.U. sometimes they are faulty. you can test them the same way you tested the thermos.

tubby, June 2012
link Click here to see other fixes for Baxi 105E.