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Cheers. Must call to inspect tomorrow. Open both zones and check flow direction. Then shut downstairs and see if flow reverses.

Im listening, can you explain if its a one pipe why all rads dont heat?

Yup I agree it is a one pipe system. And I'm thinking if I screw a 15mm showerhose non return valve into the second and subsequent rads then It has to stop!

And this is what I think may be happening : What do you guys think?

Here is a rough idea of the pipework layout: When downstairs is off the flow which is common to both acts as a one pipe system for downstairs. If a non return valve could be introduced to the flow pipe in the second and subsequent radiators on the system then all should be ok...in theory.

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Thanks guys for your help! Having drawn the system on paper. I can now see exactly what's happening. It's actually turning the circuit on the bottom of the house to a 1 pipe system, and normal flow is in reverse. If I was to fit non return valves or one directional rad valves ( if there...

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Can you explain at least where it is getting its return from? Is it one pipe through the flow or where.

I have to sort this or I don't get paid! I've seen this before on an oil boiler where pump was on the return and motorised valves were on the return. Surely swopping the valves to the flow still wont sort it. So there is no fix other than another flow back to boiler?

Think your right. Imagine this, flow and return leave the bottom of the boiler straight down to the floor. The return is T'd off and below that is the motorised valve for downstairs. Off the branch of the "T" is another motorised valve for upstairs return. Problem is flow is common to both...

Yes its a combi Problem is I now have 2 separate heating zones. When i turn the bottom of the house off to heat upstairs downstairs heats also

Hi Hope you guys can help me please. I recently removed an old system gas boiler for a customer which was open vented and feeding a copper cylinder and heating circuit with no zoning. Its a 3 storey home which had storage heating in the top 2 storeys. Sometime in the past another...

Anybody? Wondering if the gas valve has 2 solonoids, one for DHW and one for CH? Might explain my problem??

Mmm How long did you leave it? Works 9 times out of ten Only other option is to remove the rads one at a time and flush some water from both pipes one at a time, until the air lock is removed You up to that? D

Sounds like an air-lock due to sagging pipework Turn off every radiator/zone in the house apart from One of the offending radiators. On the opposite side to the TRV there is another dummy valve. Remove the plastic cap from this completely and open the valve fully using an adjustable...