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Another air lock problem

Postby scottyuk » Tue Dec 15, 2009 2:27 pm

Sorry about posting another airlock problem, I know there are a few posts about this already. Unfortunately I still can't find a solution to my problem.

I have just fitted a kitchen sink, and after plumbing it all in I found that I wasn't getting any hot water through. I stumbled across this site and tried the air lock solutions suggested.

I connected the cold water mains under my kitchen sink to the hot water pipe via a washing machine pipe. I turned on the cold water and I could hear the water rushing through, I left this going for a minute or two, disconnected the cold water pipe, and then tried the hot water again.

After about 30 seconds hot water started to come I turned on a few more taps just to make sure and after a while the pressure dropped.

So I connected the hose up and stared to flush through again. The same thing happened, hot water started to come through, then after a couple of minutes the pressure dropped.

I have tried the 4 or 5 times now and the same thing keeps happening.

Does anyone have any idea as to what’s happening, does anyone have any suggestions I can try?

Any help would be greatly appreciated.

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Simply Build It

Postby rosebery » Tue Dec 15, 2009 6:04 pm

Do you have a "conventional" DHW system with header tank in roof and hot water cylinder in the airing cupboard?

Or do you have a combi boiler?

If its the former and its is definitely air it sounds as though all you have done is pushed the air higher up in the system so you need to persevere.

If its a combi you shouldn't have an air problem at all as the whole system is at mains pressure.

Are you sure there are no valves closed which should be open? Isolating valves?

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