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ok good idea - will try this; all fault finding guides mention testing via the wiring centre terminals though - and i was curious about what to remove exactly to prevent the chance of backread signlas from other controls, etc. i will try your way now tho... thanks for your advice.

as long as the pipes do not go higher than the water level then the pump should be ok ... as seco services said, maybe a check valve in the pump is sticking.... a lot of shower pumps and showers themselves do have check valves built in...

could be an airlock - but OP if you say water comes out of rad when you bleed it then this seems v strange. did you vent the pump? doing as John says is your best bet and will probably shift any air blockage in the pipework, which can then be vented from the individual rads. Turn off only the...

well the plumber was here about 40 mins, then went out to get a new pump, then fitted it in about 25 mins. so in total took about just under 2 hours and cost was £220. not too bad i guess and he did a really good job - never had a prob since either with it (touch wood)! he said it was a...

OK so i leave the wire in the stat from the programmer (hw on terminal) and remove the other 1 (the C terminal in my case).. and c and 1 should be live (240V betwene them, otherwise the stat is not making) - i have never known to test this way before - always tested the wiring centre...

I had this happen to me a few years ago - a plumber tested and changed the pump and apparantly the pump had a bit of water into some section of it, which continuously caused the fuses to blow!!

Thanks for your help. I understand the wires and how they shouls read (now)! .. but when you say pull the wires out for testing (obviously with the power off and 3 amp fuse removed) - but do you mean take a reading of the wires with the wire ends loose and removed from the wiring centre...

Is a C PLAN allowed to be installed now under the Building Regs? As I believe the hot water AND htg need to be FULLY PUMPED. Also, my main post- i believe the cylinder thermostat is not working - and not making the circuit - i have tested the terminals voltga eusing a multimeter safely, and...