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home Fix label D.I.Y label_important Plumbing category Alpha Heating

shower goes hot then cold.... repeatedly!?

hi, i have an alpha HE cb25 boiler and ive just had a new reciever fitted as it was faulty. Now when i have a shower the water runs hot, then cold, then hot then cold... repeatedly!!! heating works fine... how do i fix... some one help....i want a normal shower! ha :P
shane, November 2010
home Fix label D.I.Y label_important Plumbing category Alpha Heatingdone
I have the same issue with the same boiler.
The heating is fine, the hot water from the tap or shower cycles hot and cold. I hear the boiler shut off when it turns cold no error lights then it fires back up with hot water again and then repeats over and over.
I have replaced the diaphragm, replaced the temperature sensors. Thinking of changing the dhw heater matrix or diverter valve.

Hammer it!, February 2012
link Click here to see other fixes for Alpha Heating CB25.

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