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Thanks for both. The 7,8,9 labels was a stupid error to type. Thanks.

I need to wire up the CH pump back in to the boiler controller board. In the schematic, it's plainly laid out as 7(N) 8(E) 9(L) The bit that is making me doubt myself is the room stat wiring. In the photo there's an earth conductor on #7. Has whoever installed it before we moved in just...

Another update. The programmer gave up. The CH relay no longer activated when the timer called for heat. Took it apart to get part numbers. Only £5 but everywhere that listed it said obsolete as was the slightly scorched square resistor. Bought a new Drayton 522 and it was working perfectly...

That's the point, it was working for 25 years or so but no longer does. No power at the pump or room stat so in the meantime, until I find the fault, it will be plugged in to mains socket on a timer.

Right. Small update. Pump was unwired from the boiler and a 3pin plug put on and plugged in. Pump instantly and silently started to whirr. Heat was back in the downstairs rads. The plumbers that came had no idea on the boiler even with the wiring diagram on the case so they rang the...

Not sure I have a spare 230v lamp. I'll check mum's garage and see what they have.

Thank you. I'll hold off on swapping the room stat for now. This weekend I'll go round and set up the connector block/wiring as you suggested and take some readings if it fails again.

Got a call from mum this morning. The heating is back on downstairs. She thinks the house is haunted because the right hand slots on the 4 slice toaster also started working this morning. At this point I don't even know what to check. Could a pump not work for s week then spring into life or...

Good question. Ne er tried. Better dig out the chocblocks.

I was thinking about that, got some wago blocks somewhere. Was just wary of the plastic spring clips that hold the conductors in place. The pump is at least 20 years old if not more and plastic doesn't fair well in that hot environment. I'll give it a go tomorrow. Thanks.

The earth Is there, it just has that oversized sleeve on it. Annoyed I can't find my needle probes for the MM.

Ok, had to wait in for a delivery yesterday so didn't get a chance to go to mum's. Here's the wiring inside the pump. Couldn't find my thinner probes, no idea where they are.

Thanks for the info. I've left my parents home for today, will be back tomorrow to get more photos. Don't have a non contact sensor but I'll see about finding my thinner multimeter probes to see if they will fit past the sheathing in the pump wiring.

There's wires everywhere in the garage where the boiler and pump is. There's a set of wires that go through the wall in a plastic pipe, under the concrete conservatory floor, under the kitchen floor and up the wall in the breakfast groom into the timer that calls for heat or (used to) hot water...

I did take the lid off the box on the side of the pump but the sheathing on the conductors at so thick that they completely block the probes from my multimeter from getting to the wires etc. Where does the voltage come from to activate the pump? Direct from the timer box or from the old EKCO...

That's what I thought but not knowing what actually activates the pump when the timer clicks on I don't know what to check/replace.

No, pump not running when upstairs rads are hot Definitely no zone valves. Boiler is an Ideal E-Type.

Parents house, heating was fine for a month. Suddenly, all the downstairs rads (five) were stone cold in the morning while the upstairs (six) ones were nice and hot. This happened two mornings in a row. While this happened, the circulation pump was not running and I thought ok I'll replace the...

Yup, you did. Never told me it would be that loud though :) Not looking forward to removing HWC but at least I'll get to see what all the extra pipes are for. There are 3 open ended ones and 3 with isolation valves. Defo on the clean and inhibitor. Parents can't remember last time it was...

small update. had to change the thermostat in the HWC as I had a small earthquake the other morning. the immersion heater did not stop at the preset 60°c and boiled it. ended up with it venting into loft tank. scared the bejeezus out of me. now have a new RDT re-settable thermostat...