No hot water from indirect cylinder

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7 Jul 2008
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Surrey
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United Kingdom
I have an indirect hot water cylinder, and a gas bolier. The immersion heater coil was replaced some weeks ago and has been fine since, and everything else has been operating fine for 4 years.

The central heating circuit is fine but I have no hot water.

The boiler fires up fine and all pumps are OK. The pipe entering the cylinder at the top of the heat exchanger gets hot but the pipe from the cylinder at the bottom of the coil stays cold. This bottom exit pipe immediately enters a Honeywell 4043, 2 port, MV. Pushing the valve lever to manual makes no difference and removing the head and manually turning the valve to open makes no difference (checked this positioning against a replacement as the flow line on the installed valve was into the coil).

Any suggestions what to look at next, any additional info needed?
 
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i assume it is an open vented system.

does the small tank in the loft have water in it ?

does its ball valve operate ?
 
thanks for the reply.

Yes it is an open vented system.

I'll check the tank and ball valve tonight.
 
Checked the tank and ball valve and both are fine.

Hence I am very confused as to what the issue is and where to go next, any help gratefully appreciated.
 
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If you bleed the highest radiator in the house, does water squirt out forcefully?

How high is this radiator compared to the cylinder?
 
what we are getting at is because the system has been drained fairly recently in order to renew the immersion this may point to the problem. the system may not have refilled correctly.

as the f&e tank seems ok the cold feed from it may be blocked. put a hose on a c/h drain point, open it & observe that the f&e tank is filling ok. if thats ok then perhaps there is air trapped in the system.
 
we've had a couple of these in the last few days, must be time of year :confused:

Beware that the cause of the problem may be different, so the cure may not be the same.

I am just a householder. I had it once in my house, after redecorating and taking off a rad, it would not refill. Turned out to be be blocked cold feed at the Tee which needed to be cut out (I've since learned this is very common, as is discovering the problem only when you try to refill). And once I had it at my mother's house, same symptoms but this one was caused by a jammed/limescaled ball valve in the F&E (was easier to fix)

If you can fix it yourself you can save a fair bit of money, and if you fit a Magnaclean as well, and give it a Chemical clean, and refill with inhibitor, you will be in a better state than ever before. If not, and it gets bad enough to need a powerflush, that would cost £hundreds
 
Have you tried running the heating AND at the same time locking the lever in the manual position and seen if that starts a flow through the cylinder heating coil?

Tony
 
Thanks all for the help. I have taken a picture to show the situation and have opened the vent on the pipe immediately behind the MV. Air did escape before water and then after repeatedly opening and closing it while the boiler was running, hot water eventually escaped.

Did not have time to detemine if this was a full fix to problem, but hopefully it was that easy. I'll post back either way.

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