S
SBDIY
I've had this problem for over a year and am struggling to solve it. I've had 2 plumbers look at it and also had the boiler serviced and yet the problem persists.
When there is a demand for CH and HW my boiler operates as it should, fires up and gets up to the set operating temperature and continues like that as long as there is a demand. When there is only a demand for HW the boiler fires up but quickly reaches the set point and trips out without any regulation of the burner. It continues like this as long as there is a demand for hot water but the water takes a long time to get hot on account of the boiler coming on for only about 20 seconds at a time and then going off for 3 or 4 minutes. I've changed just about every part on the system (tank thermostat, pump, diverter valve and header unit). I've run sludge remover through the system and drained it out yet the problem persists. I'm getting to the limit of my ability and the next thing I'm thinking of doing is checking the thermistors in the boiler. Then again it was serviced by the manufacturer (Gloworm) only 2 weeks ago and given a clean bill of health. It seems to me that the hot water is not escaping from the boiler fast enough and so the boiler shuts down to protect itself. It was working perfectly fine for the past 20 years until a year ago and then suddenly just started doing this after I drained it to fit a new rad. I have drained it many timed before and never had a problem. I don't think its air as I've bled the system and it runs very quietly apart from this problem.
I really hope someone can help me solve this.
When there is a demand for CH and HW my boiler operates as it should, fires up and gets up to the set operating temperature and continues like that as long as there is a demand. When there is only a demand for HW the boiler fires up but quickly reaches the set point and trips out without any regulation of the burner. It continues like this as long as there is a demand for hot water but the water takes a long time to get hot on account of the boiler coming on for only about 20 seconds at a time and then going off for 3 or 4 minutes. I've changed just about every part on the system (tank thermostat, pump, diverter valve and header unit). I've run sludge remover through the system and drained it out yet the problem persists. I'm getting to the limit of my ability and the next thing I'm thinking of doing is checking the thermistors in the boiler. Then again it was serviced by the manufacturer (Gloworm) only 2 weeks ago and given a clean bill of health. It seems to me that the hot water is not escaping from the boiler fast enough and so the boiler shuts down to protect itself. It was working perfectly fine for the past 20 years until a year ago and then suddenly just started doing this after I drained it to fit a new rad. I have drained it many timed before and never had a problem. I don't think its air as I've bled the system and it runs very quietly apart from this problem.
I really hope someone can help me solve this.