I think that my boiler's thermostat might be faulty - the oil-fired boiler is in a cupboard off the utility room and the thermostat is in the hall.
Noticed about a week ago that the radiators were only warm when the thermostat was turned up to about 20. Turned it up to 25 and all was well.
Today the same thing happened again, but turning it up to 27 has got the radiators hot again.
Now it's definitely not my imagination, ie it IS getting colder in the house when it should be warm, ie it's not just me imagining it's colder!
So is the thermostat at fault?
It's an old 'Lifestyle' thermostat with a square surround and a round dial.
Could I perhaps repair/service it myself? Or is it a job for a plumber?
Or could I replace it? Or is that too a job for a plumber?
Thanks