Following from loadsafranks problem, I may have similar. Hot water cylinder replaced some weeks ago. Along with valve in flow to cylinder coil (inlet at bottom of tank), held for the moment in open position (I don't want to wire it in until this problem is solved). I CANNOT seem to get water (from the boiler) to flow through the coil - consequently it won't heat water and I'm stuck with the immersion heater (desperately uneconomical!). The cirsulating pump has been replaced to see if the old one (25 years on the run) was knackered, but no difference. A bathroom radiator tapped of the indirect circuit, however, continues to heat fine: its return pipe to the boiler enters the vent pipe (to expansion tank and down to the boiler)) about 40cm below the return from coil. Replacement valve checked out - seems okay: no restriction to flow. Coil "blown through" (when empty!) - again, no apparent restriction. SO it must be a stubborn air lock? Presumably I need pressure to force the air out of the coil into the vent pipe? Could it really be that stubborn? Is it anything to do with horizontal flow and return pipes to coil, and right angle joints to main flow and return (vent) pipes? Please help me get cheaper hot water for Christmas!
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