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We moved into our current home in June. The heating is supplied by a 10 year old WB Greenstar CDi 37kkW combi boiler. I had the boiler checked by a local GSR engineer who has serviced my son's boiler for many years. He said it was working correctly.
So far it has worked OK, getting the house up to temperature each morning. A few days ago, however, when it began to get much colder outside, we noticed that the room temperature was much lower, even though the room stat was still set to 21C. I turned the stat right up to 24C but the room temperature only rose half a degree.
I decided to watch the boiler and found that it was heating up to about 55C (set to approx 75C) then switching off. Pump overrun would start and the temperature would drop to about 35C before restarting. So the cycle continued. I checked parameter 9C (heat output) and it was only getting up to 50%.
Why is this happening and what's the solution?
So far it has worked OK, getting the house up to temperature each morning. A few days ago, however, when it began to get much colder outside, we noticed that the room temperature was much lower, even though the room stat was still set to 21C. I turned the stat right up to 24C but the room temperature only rose half a degree.
I decided to watch the boiler and found that it was heating up to about 55C (set to approx 75C) then switching off. Pump overrun would start and the temperature would drop to about 35C before restarting. So the cycle continued. I checked parameter 9C (heat output) and it was only getting up to 50%.
Why is this happening and what's the solution?