Hi guys I wonder if anyone can help me. I have a Baxi 105 he instant boiler. Today I came home to find the CH on, but there was No demand and not selected to run at that time (timer). The boiler was firing the instant hot water but heating the rads. Hot water has been iffy for a couple of weeks, not cutting in on flow first time, have had to turn off and on again. Do you think its the diverter stuck in CH or part way between CH and DHW? Do you think it could be CH diverter diaphragm. With the DHW temp turned off and HW tap turned on boiler fires so guessing DHW diaphragm is ok? Help/advice please. Cheers Paul