I had an Ultracom 15hxi condensing boiler installed in October 2008. It replaced a Baxi boiler, installed in the garage, which was about 14 years old. The Baxi did not have an inbuilt frost protection device; instead a Honeywell frost stat was wired alongside the boiler.
The new Ultracom was also installed in the garage and it was wired into the Honeywell stat as a secondary means of frost protection.
On cold nights the pump and boiler have been kicking in for long periods of time. Last night was exceptionally cold; outside it was -5 degrees and the boiler / pump ran for 2 hours, keeping us awake in the middle of the night because the indoor house temperature reached 22 degrees (whilst all heating controls were set to off). The boiler display showed 70 degrees during a spot check at 2.30am.
I shut off all radiator valves in the hope that more heat would return to the boiler quicker and the frost stats would no longer need to operate. 30 mins later the boiler / pump stopped.
As well as preventing sleep, overheating the house and costing money, I also have a sense that I am not in control of my own heating system!
Does anyone have ideas on how to prevent this situation arising:
Should the installer remove or bypass the Honeywell frost stat?
Is there a boiler fault (since the boiler temp is reaching well above the 35 degrees temp indicated in the user manual when the frost protection kicks in?).
Any help on my first post would be appreciated.
The new Ultracom was also installed in the garage and it was wired into the Honeywell stat as a secondary means of frost protection.
On cold nights the pump and boiler have been kicking in for long periods of time. Last night was exceptionally cold; outside it was -5 degrees and the boiler / pump ran for 2 hours, keeping us awake in the middle of the night because the indoor house temperature reached 22 degrees (whilst all heating controls were set to off). The boiler display showed 70 degrees during a spot check at 2.30am.
I shut off all radiator valves in the hope that more heat would return to the boiler quicker and the frost stats would no longer need to operate. 30 mins later the boiler / pump stopped.
As well as preventing sleep, overheating the house and costing money, I also have a sense that I am not in control of my own heating system!
Does anyone have ideas on how to prevent this situation arising:
Should the installer remove or bypass the Honeywell frost stat?
Is there a boiler fault (since the boiler temp is reaching well above the 35 degrees temp indicated in the user manual when the frost protection kicks in?).
Any help on my first post would be appreciated.
