Help! Moved into bungalow a few months ago, and whilst CH is fine, shower (and other taps) run hot, then cold then hot etc., ad nauseum.
Plumber and Vaillant said secondary H/Ex, which was replaced. No change, and old heat exchanger looks fine...
Observed display panel when shower operating with no other taps used.
Water at 65 deg., then starts dropping to around 31 degrees. 'C' flashes on display, then boiler fires up and temperature rises until it starts falling again, then repeats. Water pressure in the green the whole time.
Vaillant no help at all. Boiler 5 years old, and don't know where to turn next!
Any ideas, anyone?
Thanks
Ian
Plumber and Vaillant said secondary H/Ex, which was replaced. No change, and old heat exchanger looks fine...
Observed display panel when shower operating with no other taps used.
Water at 65 deg., then starts dropping to around 31 degrees. 'C' flashes on display, then boiler fires up and temperature rises until it starts falling again, then repeats. Water pressure in the green the whole time.
Vaillant no help at all. Boiler 5 years old, and don't know where to turn next!
Any ideas, anyone?
Thanks
Ian