I have been reading up on the possible cause but I am not sure on what path to take.
The system is vented and has not had work done on it. Piping is run in 15mm (?) plastic.
I have the radiators in the hall and downstairs loo stone cold. The flow and return pipes are cold. The radiators had been working but I think the one in the loo was getting progressively cooler last winter.
The radiator in the loo has a lockshield and TRV, but the hall has a wheelhead and lockshield valve as the room stat is in the hall. I have checked the hall radiator and the valves are open. I have not yet checked the TRV in the loo yet.
Is this an air lock or pipe blockage? I would like to change the radiator in the loo (and also in the bathroom) so would this be an opportunity to add a cleaning agent to the system, drain and refill? I would like to know that the radiators were fully working before I do this.
TIA
The system is vented and has not had work done on it. Piping is run in 15mm (?) plastic.
I have the radiators in the hall and downstairs loo stone cold. The flow and return pipes are cold. The radiators had been working but I think the one in the loo was getting progressively cooler last winter.
The radiator in the loo has a lockshield and TRV, but the hall has a wheelhead and lockshield valve as the room stat is in the hall. I have checked the hall radiator and the valves are open. I have not yet checked the TRV in the loo yet.
Is this an air lock or pipe blockage? I would like to change the radiator in the loo (and also in the bathroom) so would this be an opportunity to add a cleaning agent to the system, drain and refill? I would like to know that the radiators were fully working before I do this.
TIA