baxi 105e intermittant DHW

[mickyq]

had intermittant hot water for over a week.
changed diaphragm and nut at front today. worked fine for a few hours then water went cold again. pin is hitting micro switch ok. turned off radiators, turned hot tap on and was working again. any ideas guys?

 

[Boilerman2]

Get a Service Engineer in could be one of several problems I went to one this morning some body had told the cust that the PCB was faulty, turned out to be an incorrectly set modureg! get a good RGI Service engineer

 

[qplumb2010]

could be dhw heat exchanger