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We have an external WB oil boiler and it has been firing when ever it drops below 5 degrees which we could expect. However, it then goes on to heat the entire house despite thermostat programmed in to heat if it drops below 13 at night. It has got the house to 24 degrees when kicking in.
We have had a return valve changed, that the plumber said will be causing the hot water to then circulate in the house. Didn't work.
Had a WB expert come and change a temp sensor on the boiler, despite him saying it won't work and it'll be a wiring issue. He was right.
Any ideas why our boiler decides to heat the rads when only the frost protection should warm the outside pipes to about 20 degrees?
Thanks in advance!
it’ll be a wiring issue. He was right.
The answers right there isn’t it? The wiring issue is at your ‘wiring centre’ not a boiler issue. Find a better plumber or diagnose the wiring yourself.
The internal frost protection (it could be external) kicks in the boiler below 5 degrees. Once above 5 degrees, it should turn off.
Firstly find where your sensor is.
Piping - when on 'frost protection duty' the pipes around the boiler area should be warmed up. To do this the boiler starts up, heats the water, pumps it around.
Yours is opening the valve for the radiators (thinking about it, is there a valve?), but not cutting out when it gets above 5 degrees.
So, either the the frost stat is not working correctly, or , the zone valve for the radiators hasnt been wired correctly, or, there isnt a return loop for the internal heated water - it is using the radiators to return to the boiler.
Frost stat - could not be getting up to temperature after it has called for heat at 5 degrees. Many boilers have an internal heat stat, which turns the boiler off at 25 -50 degrees, at which point there is enough heat to stop a frost.
It could be any combination of the above.
To give a better clue, more details of your system is required, along with how many valves etc.
Has it just started doing this or is this it’s normal MO?
If it’s just started doing it, I’d be looking at a stuck valve. If it’s always done it, I’d be looking at the wiring.
Assume it's a system boiler rather than a combi
Our outdoor grant has a <5c frost protection but as it's casing temp and there is a big tank of 60 Deg water in there I have bigger issues than the frost protection not working.
So if it's a system I'd be looking at valves. If it's a combi I'd be surprised if it should be kicking in at all.