Wonder if someone can point me in the right direction.
Potterton Profile 80E (I think). Lots of rad stats, but towel rail in bathroom doesn't have one. Also have a wiser room stat in lounge but ordinary rad stats which are fully open there, i.e. there are at least a couple of paths for water to always circulate.
However, when it gets cold out / the boiler is on quite a bit then after a while the overheat trips and I have to reset it. The heat control on the boiler is set to about 5 (i.e. not max).
So why does the boiler being on quite a bit eventually cause the overheat to trip? I'm guessing that it being cold out means the boiler is on quite a bit of the time so doesn't cool down enough, but surely if hot water is returning to the boiler then it shouldn't be heating it further? I'm doubtless not understanding how it works.
Wondering if the stat needs replacing or if the heating control may be having no effect (always on max), or is the pump on too low a setting (it's quite noisy if I put it on fastest and keeps me awake on cold nights as the boiler is in the garage and gets cold so sometimes kicks with frost stat) or what...
Thanks
Potterton Profile 80E (I think). Lots of rad stats, but towel rail in bathroom doesn't have one. Also have a wiser room stat in lounge but ordinary rad stats which are fully open there, i.e. there are at least a couple of paths for water to always circulate.
However, when it gets cold out / the boiler is on quite a bit then after a while the overheat trips and I have to reset it. The heat control on the boiler is set to about 5 (i.e. not max).
So why does the boiler being on quite a bit eventually cause the overheat to trip? I'm guessing that it being cold out means the boiler is on quite a bit of the time so doesn't cool down enough, but surely if hot water is returning to the boiler then it shouldn't be heating it further? I'm doubtless not understanding how it works.
Wondering if the stat needs replacing or if the heating control may be having no effect (always on max), or is the pump on too low a setting (it's quite noisy if I put it on fastest and keeps me awake on cold nights as the boiler is in the garage and gets cold so sometimes kicks with frost stat) or what...
Thanks