C
COYS
Typically heating misbehaves just as it starts to get cold!
Boiler: Vaillant Eco-Tec 24kw. 8 Rads, 2 towel rails.
Boiler set on max, flow piping hot out of boiler, return cold. With all rads open both sides, next to no heat. Balance rads right down, still only tepid. Operate one at a time, heats up ok.
Flushed & refilled, no apparent blockage as individually each rad gets hot. More than one, barely warm.
Boiler fires for a minute or so but goes back to standby quickly & before return is warm.
Status screen says pump operational & it seems to be running. Blocked or inefficient maybe?
No problem with DHW just the heating side. Should add that system just a couple of years old, all was ok when heating last used around June & no modifications since. Pipe sizes seem ok with 22 copper up to 4.5m from boiler thereafter in 15 hep, very few elbows etc.
At a loss & freezing! Any advice much appreciated. I have had a look through the similar threads without success thus far.
Boiler: Vaillant Eco-Tec 24kw. 8 Rads, 2 towel rails.
Boiler set on max, flow piping hot out of boiler, return cold. With all rads open both sides, next to no heat. Balance rads right down, still only tepid. Operate one at a time, heats up ok.
Flushed & refilled, no apparent blockage as individually each rad gets hot. More than one, barely warm.
Boiler fires for a minute or so but goes back to standby quickly & before return is warm.
Status screen says pump operational & it seems to be running. Blocked or inefficient maybe?
No problem with DHW just the heating side. Should add that system just a couple of years old, all was ok when heating last used around June & no modifications since. Pipe sizes seem ok with 22 copper up to 4.5m from boiler thereafter in 15 hep, very few elbows etc.
At a loss & freezing! Any advice much appreciated. I have had a look through the similar threads without success thus far.