Discuss No Hot Water - Gravity Fed System in the Plumbing Jobs | The Job-board area at PlumbersForums.net
You can still have an airlock. Pipes will fill up with water but still leave air trapped somewhere on a level pipe or high spot. Might be best to try a careful blast of mains water through them if all else fails.
We recently worked on a plastic sealed system that must have been poorly installed as there were air locks everywhere, even when it was fed by mains pressure.
In the end we had to connect the power flushing machine, cleared the air locks in seconds.
It was hard for me to get what your saying. So are you saying you changed the motorised valve for the hot water/ so the coil one yet your not getting hot water out the cylinder but you've got hot water to the valve
Has the cylinder got water in it by that I mean have you checked the ball valve for sticking
I had to part drain down the system in order to change the hot water zone valve body only (not actuator head). On refilling the system, I could not get the hot water circuit back again due to either an airlock or blockage. Despite several attempts to rectify it, the hot circuit is still not working !
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