Hi everyone,
I have CH with a system boiler with a header tank and 8mm micro bore pipes to the radiators, fairly standard setup I guess. House is 1990s.
My issue is that two of my radiators are cold, while the rest are perfectly fine. Both the problem radiators are downstairs and close together, on either side of the same wall. One in the lounge and one in what was originally the dining room. Previously, only one radiator was cold, the other was ok. But since I had some TRVs fitted recently and the system was drained/refilled, neither has worked.
The plumber told me that it must be a sludge/blockage issue, and advised me to pay him to do a Powerflush. I'm ok with that in principle, but I want to be sure that's the right thing to do first.
Here's what I've tried so far:
Does this sound like a job for a powerflush, or should I try anything else first?
Thanks in advance.
I have CH with a system boiler with a header tank and 8mm micro bore pipes to the radiators, fairly standard setup I guess. House is 1990s.
My issue is that two of my radiators are cold, while the rest are perfectly fine. Both the problem radiators are downstairs and close together, on either side of the same wall. One in the lounge and one in what was originally the dining room. Previously, only one radiator was cold, the other was ok. But since I had some TRVs fitted recently and the system was drained/refilled, neither has worked.
The plumber told me that it must be a sludge/blockage issue, and advised me to pay him to do a Powerflush. I'm ok with that in principle, but I want to be sure that's the right thing to do first.
Here's what I've tried so far:
- Tested on all available CH pump speeds. The pump is fairly new anyway and feeds all the other radiators fine even on minimum speed.
- Turned all the lock shields off except for one of the cold radiators at a time and ran the pump on max. The pipe and valve gets hot but the rad doesn't.
- Opened the drain valve on each radiator one at a time to see how fast water was released. Compared this with one of the 'good' radiators. The water flow is about half the rate from the cold radiators as from the good one. Noticed that the cold radiators actually get warm during this process, but go cold again afterwards?? Don't get why.
Does this sound like a job for a powerflush, or should I try anything else first?
Thanks in advance.