Airlock in hot water

[gaz23]

Hi, this is my first post. i hope someone can help me, i drained an indirect combi -cylinder with pump attached, and think i have drawn air in. i have tried forcing cold water through system but it stays the same? just dribbles out. thanks

 

[secret squirrel]

Try forcing the cold water through longer. You may not have hit the air lock yet. Best way is connect up a washing machine hose to the hot and cold washing machine connectors turn the hot on first then the cold.

If you haven't got a hot washing machine connector then put one on, it'll take 5 minutes (depending on access of course)

 

[gaz23]

Cheers, i put cold through kitchen tap mixer at least a minute until it came through bath taps then closed hot tap on bath then through basin then closed hot tap on basin? also should i have pump on or off when i do this? Thanks

 

[kaysee]

Pump will have no effect as its an indirect cylinder, pumped water goes through the coil within the cylinder.

 

[WaterTight]

He said it's a "combi-cylinder" - so I'm guessing a fortic? The pump could be on the DHW..

If so, have you turned pump back on? Or maybe you left pump on when draining and now it's buggered?

 

[kay-jay]

you need to manually open the 3 port valve or the water won't reach the cylinder!

 

[gaz23]

Thank you to everyone who replied. it turns out it was a positive head pump plus the cold to the pump was mains fed, i have no idea why it worked in the first place unless the mains was triggering the flow switch. i fitted a single negative head pump to the hot and left cold on mains