I've started a new thread for this - my previous thread dealt with a blocked 15mm feed to a rad. In sorting that problem, a new one has appeared.
Vented system
GlowWorm Ultimate 120FF
New pump just over a month ago
Motorised diverter valves checked (one valve was stuck and has now been released, both powerheads work OK)
System flushed through with Furnox Heavy Duty Restorer (to be drained tomorrow and refilled)
After draining the system, clearing a blocked rad pipe and refilling, I now have very reduced flow to all radiators. Some get lukewarm and some are stone cold. Also, air is getting into the system and the rads are needing to be bled / vented very often.
The Feed and Expansion tank in the loft is steaming and the vent pipe is pumping over like a good 'un. The top of the vent pipe is about 18" above the top of the expansion tank. Sometimes the F&E tank is half full, sometimes it is almost overflowing..
Being a layman (but learning rapidly !), I'd just like to double check something. The 15mm cold feed pipe exits the base of the F&E tank, runs across the loft, takes a 90 degree turn downwards and reappears in our airing cupboard. Here it 'T's into a 28mm pipe which exits the immersion heater about half way up. The 28mm pipe goes back to the pump / boiler which are in a boiler room connected to the back of the house.
After reading many threads on diynot, am I correct in my thinking that the pumping over is probably associated with a blocked cold feed and the likely place for this to occur is at the T piece where the 15mm feed meets the 28mm main pipe ?
Many thanks for your advice and patience...
Vented system
GlowWorm Ultimate 120FF
New pump just over a month ago
Motorised diverter valves checked (one valve was stuck and has now been released, both powerheads work OK)
System flushed through with Furnox Heavy Duty Restorer (to be drained tomorrow and refilled)
After draining the system, clearing a blocked rad pipe and refilling, I now have very reduced flow to all radiators. Some get lukewarm and some are stone cold. Also, air is getting into the system and the rads are needing to be bled / vented very often.
The Feed and Expansion tank in the loft is steaming and the vent pipe is pumping over like a good 'un. The top of the vent pipe is about 18" above the top of the expansion tank. Sometimes the F&E tank is half full, sometimes it is almost overflowing..
Being a layman (but learning rapidly !), I'd just like to double check something. The 15mm cold feed pipe exits the base of the F&E tank, runs across the loft, takes a 90 degree turn downwards and reappears in our airing cupboard. Here it 'T's into a 28mm pipe which exits the immersion heater about half way up. The 28mm pipe goes back to the pump / boiler which are in a boiler room connected to the back of the house.
After reading many threads on diynot, am I correct in my thinking that the pumping over is probably associated with a blocked cold feed and the likely place for this to occur is at the T piece where the 15mm feed meets the 28mm main pipe ?
Many thanks for your advice and patience...