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[I_want_an_Omega]

Ok, further to my previous post of a week or so back, I've now got the heating working properly. 

Diagnosis was that the both motorised valves had broken microswitches. I had some really good tech support from Drayton which helped pin this down - with continuity checks etc. Due to the age of the valves (1999) they are a single unit - whereas the updated version has the valve body and separate/removable actuator/microswitch gubbins. Having a new boiler which controls the pump directly sort of masked the fault - which saw the pump running for long periods & just pumping around the bypass.

New valves sourced and fitted today, plus a full service on the boiler.

The final little twist was why exactly the earth breaker was tripping about once a day. Drayton suggested checking the tightness of all the connections in the junction box located in the airing cupboard. They were right, with there being several which were not at all tight. All sorted now and working as intended.

So, nice & toasty for Christmas.

[Kevin Wood]

You can actually replace the microswitches in them with a little dismantling, and they are the same part as the ones in the Omega central locking motor.

[I_want_an_Omega]

You can actually replace the microswitches in them with a little dismantling, and they are the same part as the ones in the Omega central locking motor.

Thanks - will have a look at the old ones when i've got a minute or 10 spare. Good news is that if the problem happens in another n years that the head unit is replaceble - although knowing my luck that will be obsolete by then 

[Shackeng]

You can actually replace the microswitches in them with a little dismantling, and they are the same part as the ones in the Omega central locking motor.

Handy to know, if one fails just rob the Omega.

[I_want_an_Omega]

You can actually replace the microswitches in them with a little dismantling, and they are the same part as the ones in the Omega central locking motor.

Handy to know, if one fails just rob the Omega.

Don't have one to rob

[Andy H]

Beware of any wiring schematics that pass the current to drive the pump through the microswitches. The inductive load destroys the contacts in the microswitches.

[Kevin Wood]

Beware of any wiring schematics that pass the current to drive the pump through the microswitches. The inductive load destroys the contacts in the microswitches.

Indeed. that's exactly what the post-mortem told me. Keep meaning to put a snubber across each one.