I have a Potterton 28i boiler giving trouble. It keeps heating the hot water by turning the pump for the central heating off and it won't re-start. I have discovered by turning the hot water control to off, the central heating fires up again and works fine. Is this a sensor problem?
My newly installed Potterton Promax 28 HE+ condensing combi has hot water priority as is standard with combi's. My "duty selector dial" has positions for "reset", "rads. & DHW", "O" for off, and "DHW". The rads. and DHW are sketches. Try your hot taps when apparently deselected ;--- you may find that the unit is actually in DHW priority mode, and suitable for continuous use, alternating flow from taps to rads.
Detailed info. on control set-up for your particular will be available from BAXI POTTERTON. Aftersales service 08706 017 017, Technical Enquiries 08706 049 049.
The boiler is 6 years old. When the heating is running the radiator light switches off and the tap light comes on without turning a tap on. The radiator light will not come back on until the water control is turned to off. ie to get hot water, I have to turn water control on then off when finished, otherwise we get no radiator heating as it stays constantly on the hot water.