The boiler is about 12 years old and was working correctly until a few days ago when it decided to go on strike - no heating or hot water. The pressure had gone down to zero. I tried to repressurize it but had diffuculty fitting the key - so did my son, who pointed out that there was some water on the undertray. I phone my engineer who visited late that afternoon.
He repressurized the boiler and said that the water on the unndertray had dripped from the condensate pipe connection. As the boiler was workng he said he would come back yesterday (which ended up as this morning) to fix the condensate pipe.
This morning, the boiler was off and displaying the F7 error code. I informed the enginer when he arrived and that the boiler was turning on and off continually. He said it sugested the condensate pipe was frozen. (It's a 21mm plastic pipe which comes down the side of the house from the airing cupboard on the first floor. A quick check prooved the pipe was blocked so he set about unblocking it with kettles of boiling water. Another check and he declared it unblocked. He then replaced the faulty connection between syphon and discharge pipe. When he left, the boiler seemed to be working correctly, eventhough the house was cold.
However, we soon noticed that the house was taking a long time to heat up. A quick check showed that the boiler was only getting up to 55C, stopping, dropping to 45C, then restarting. It normally gets up to 75C without any problems. So I checked all the boiler parameters - they were all correct. I then checked parameter 9.c (actual heat output). When the boiler ignited it went immediately to 50%, but then dropped quickly to 32%, the minimum, and stayed there.
I then checked parameter 4.F (syphon fill program) which showed 1 - on, min output. I changed this to 0 and saved the changes. The boiler restarted and the water is now getting hotter.
Why would the boiler stay on minimum output after the syphon has finished filling?
I have reset parameter 4.F to 1 as the manual says it should only be turned off to carry out servicing work.
He repressurized the boiler and said that the water on the unndertray had dripped from the condensate pipe connection. As the boiler was workng he said he would come back yesterday (which ended up as this morning) to fix the condensate pipe.
This morning, the boiler was off and displaying the F7 error code. I informed the enginer when he arrived and that the boiler was turning on and off continually. He said it sugested the condensate pipe was frozen. (It's a 21mm plastic pipe which comes down the side of the house from the airing cupboard on the first floor. A quick check prooved the pipe was blocked so he set about unblocking it with kettles of boiling water. Another check and he declared it unblocked. He then replaced the faulty connection between syphon and discharge pipe. When he left, the boiler seemed to be working correctly, eventhough the house was cold.
However, we soon noticed that the house was taking a long time to heat up. A quick check showed that the boiler was only getting up to 55C, stopping, dropping to 45C, then restarting. It normally gets up to 75C without any problems. So I checked all the boiler parameters - they were all correct. I then checked parameter 9.c (actual heat output). When the boiler ignited it went immediately to 50%, but then dropped quickly to 32%, the minimum, and stayed there.
I then checked parameter 4.F (syphon fill program) which showed 1 - on, min output. I changed this to 0 and saved the changes. The boiler restarted and the water is now getting hotter.
Why would the boiler stay on minimum output after the syphon has finished filling?
I have reset parameter 4.F to 1 as the manual says it should only be turned off to carry out servicing work.
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