It was all filled and working over most of a fortnight in Scotland - during which the car nearly died and I had to have emergency dental treatment for an abcess. In some ways the hot water was the least of it :)
However it just suddenly went to a trickle, system full, pump running...
Switch off the system and take out the drain plug.Note how much water comes out.Start system with drain plug out you should have a "Gushing"flow,if not it sounds as if the non return valve to the heater has jammed.
The valve is located just before the heater and will need replacing.
the non return valve has failed and needs replacing asap. when this happens no cold water is getting into the hot tank so do not switch on. to test remove the drain plug outside, if water is gushing out when the pump is activated then it the NRV is ok. if it only trickles out then it is blocked or stuck in position. try gently pushing a 10 inch water colour brush into the drain hole handle first with the pump running, you will know if you freed off as water will gush out when free. cured mine. failing this contact gary about replacing it.
------------- the only silly question is the one you do not ask.
Not yet mate - too soggy on storage site to get at it... I live in Somerset... thankfully a bit higher than the Levels. I'll get at it once I can get it over to home, probably a few weeks. Thanks though, I'll let you know how I get on!
Sigh... got another valve and removed old one which broke off in heater body. Had to make saw cuts in it then lever bits out and clean threads with limescale remover and a toothbrush.
Fitted new one now kitchen tap still a trickle, bathroom tap good flow but water not heating up and heater fault light coming on after turn bathroom tap off.
Old one was just an empty tube, new one has ball in end so old one must have lost ball? Gone inside heater and blocked something?
Any more suggestions Michael or anyone else... I am desperate to fix as may be selling it to upgrade - got sight of a bargain.
Torsteve, are you sure you replaced the right hose connector? If yours is a carver cascade bolier, the NRV is situated at the bottom with a cold water hose connection. The top hose connection is straight through and connected to the hot water hose.
Yeah - that's the one I changed! I have given up and booked a repair much as it grieves me not to solve it myself but I need to be able to use it soon.
As far as I read it you did not test for flow out of the drain, but now it should gush out when the pumps on?
If so, then next is to put the drain bung back in and after removing the plastic flue cover outside, remove the nut from the quick drain valve, (QDV), top left above the drain bung.
If plenty of water is getting into the heater then water should gush from this open end at the top of the heater, if it does then the blockage is in the pipework to the taps and as it's both taps, before the pipework splits off to either tap.
If not though and it only trickles out if at all, then the narrow drilling from drain bung hole up into the heater is blocked.
If this is the case, a simple way to remove what will be bits of limescale that have congealed into a lump, is the roughly connect a hosepipe using electrical tape to built up the hose diameter. Now hold it reasonably tight in the bung hole but not fully sealed so allow the swirling water from the hose to nibble away at the blockage and clear it.
Important here to leave the QDV open so air can get out so not restricting water getting in nor over pressurising the tank
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Topic: No flow from Hot tap
