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It is the small thumb valve that I’ve been bleeding, not the red one (not touching that!). Water coming out, not air. Was initially cold, but gets hotter after a bit however the hot water isn’t getting to the cylinder as pipe cold at the bottom despite valve being open. Have been carefully...

Bleed valve to get rid of any air. It’s what we usually open when system is emptied/refilled to do any work and gets rid of airlocks. It’s a horizontal 300L cylinder (on 3rd leve), unvented with Vaillant Ecotec system boiler (at ground floor)

Aaaargh! We STILL have no hot water (it’s running cold). Plumber is stumped! (Immersion heater not working.) he has: 1. removed the synchron motor above cylinder and set valve to open 2. Checked all other valves 3. Got us to put all radiators off and crank up heating thermostat to force any...

Have put immersion heater on. He’s not available over weekend unfortunately. Have had airlocks in the past when work was carried out, but has always resolved itself after bleeding the cylinder valve.

Help please! Our (Gas Safe) plumber drained our unvented system (Vaillant Ecotec system boiler) to replace a radiator valve. He refilled it but said we should bleed upstairs radiators & valves to get rid of air. Have done that, and heating is working fine, but our hot water is running cold. I...