Hello, We had an extension built seven years ago. Initially the builders' plumber connected the heating to the house system but this didn't work. The builder got him out again and he created a separate heating circuit from the boiler (ie one circuit for the house, the other for the extension).
This worked well till we had to get a new boiler (Viessmann) three months ago. Our own plumber (nice chap, used him for years!) power-flushed the system and flushed each rad by hand. Since then we have had trouble with getting the three rads in the extension to work together.
The wet room rad (R1) is always hot. R2 is hot since it was last balanced. R3 was cold then hot but is now stone cold again. Our plumber thought we might have a blockage but a high-strength cleaner and bleeding and balancing appeared to have worked -- we have had all radiators hot for a heady 48 hours.
So to my questions:
:: In the initial system the builders' plumber put TRVs on R2 and R3. With the separate system he gave us a Honeywell thermostat just for the extension. Could these be fighting each other?
:: The pipe out of the wall to the lockshield side of R3 gets hot while R3 itself stays cold. Could the builders' plumber have put the TRVs on the wrong side of the rads?
:: With the out and return pipes (see illustration) one is hot and the other usually but not always only lukewarm. Is this usual (regular builder is on holiday somewhere exotic at the moment, so I can't ask him)?
What I haven't mentioned so far is that the room is home to a grumpy octogenarian who seems to take personally our failure to get her heating going. With that in mind, any and all advice will be appreciated.
This worked well till we had to get a new boiler (Viessmann) three months ago. Our own plumber (nice chap, used him for years!) power-flushed the system and flushed each rad by hand. Since then we have had trouble with getting the three rads in the extension to work together.
The wet room rad (R1) is always hot. R2 is hot since it was last balanced. R3 was cold then hot but is now stone cold again. Our plumber thought we might have a blockage but a high-strength cleaner and bleeding and balancing appeared to have worked -- we have had all radiators hot for a heady 48 hours.
So to my questions:
:: In the initial system the builders' plumber put TRVs on R2 and R3. With the separate system he gave us a Honeywell thermostat just for the extension. Could these be fighting each other?
:: The pipe out of the wall to the lockshield side of R3 gets hot while R3 itself stays cold. Could the builders' plumber have put the TRVs on the wrong side of the rads?
:: With the out and return pipes (see illustration) one is hot and the other usually but not always only lukewarm. Is this usual (regular builder is on holiday somewhere exotic at the moment, so I can't ask him)?
What I haven't mentioned so far is that the room is home to a grumpy octogenarian who seems to take personally our failure to get her heating going. With that in mind, any and all advice will be appreciated.