Hi
Have a potterton puma 100, the ch is fine and Hot water ok but the boiler occasionally makes grumbling noises when on HW only and the pilot goes out (intermittent). Is this likely to be the DHW diaphragm flow switch sticking causing over heat and lock out or a problem with the diverter valve?
Cheers
Have a potterton puma 100, the ch is fine and Hot water ok but the boiler occasionally makes grumbling noises when on HW only and the pilot goes out (intermittent). Is this likely to be the DHW diaphragm flow switch sticking causing over heat and lock out or a problem with the diverter valve?
Cheers