Hi,
Had a similar problem before which was down to the Plate heat exchanger being partially blocked. On DHW mode water goes hot/cold/hot/cold (and trips now and then) as burner goes on and off. I assume on the primary stat temp control?? On shut off of DHW some kettleing can be heard and occasionally trips.
When opening the boiler to take a look, scale and a slight leak around the DHW micro switch.... changed the sw last year.. no leak then. I have the part no for the diaphragm 801191, but should i replace the brass housing / gland too?? and if so what part number is it... i cant find it on the net??
Also not 100% sure the burner is modulating.... on DHW it just seems to go on and off at the moment..... was thinking the plate heat exchanger and poss dhw switch prob may be causing that some how??
All help most welcome.
Ta all.
Had a similar problem before which was down to the Plate heat exchanger being partially blocked. On DHW mode water goes hot/cold/hot/cold (and trips now and then) as burner goes on and off. I assume on the primary stat temp control?? On shut off of DHW some kettleing can be heard and occasionally trips.
When opening the boiler to take a look, scale and a slight leak around the DHW micro switch.... changed the sw last year.. no leak then. I have the part no for the diaphragm 801191, but should i replace the brass housing / gland too?? and if so what part number is it... i cant find it on the net??
Also not 100% sure the burner is modulating.... on DHW it just seems to go on and off at the moment..... was thinking the plate heat exchanger and poss dhw switch prob may be causing that some how??
All help most welcome.
Ta all.