Refilling heating system after draining. Help and information on all topics relating to your central heating, air conditioning and ventilation issues.

[Robert Yule]

Having drained the central heating system to replace a radiator, after following correct procedure,no water is going back into the system. Expansion cistern fills but nothing else.

[ALDA]

FEED PIPE MIGHT BE BLOCKED WITH SLUDGE FROM TANK WHEN REFILLING SYSTEM OR THERE MIGHT BE AN AIRLOCK.

[htg engineer]

Open a vent on a radiator - connect a sentinel dosing bottle and pressurise - or I have done this and it has worked - anti bacterial wipe for rad - place mouth over and blow, normally clears it if it's just air.

If it's a blockage - get a length of hose - in tank and push down the pipe feeding the heating system see if it'll clear.