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Right then, I have just check continuity on all the feeds from the room stat and the programmer wall plate. All is well apart from the live from the programmer wall plate has no continuity upto the junction box.. (wondering if that has shorted somewhere)? As for the wiring in the junction...

mid position valve is moving freely. I have replaced the old actuator, leaving the system setup exactly as it was before when the heating was working. It is still blowing as soon as you switch the spur on. I removed the programmer and it did not blow. I know everything is connected from...

Just checked the wiring which is all in accordance with the diagram from the installation manual for the boiler. However, just to spice things up now the fuse blows whenever I switch the spur on.. Got an NIC EIC inspector coming over tomorrow to have a look at it.. Not happy ! :evil:

Just trying to find the diagram to check it.. Something is definitely to cock !!

we did bridge it before (by-passing the 3-way valve), and the boiler and pump all ran fine.. we couldn't find any earth faults on the actuator, but as that was the only part we had removed, assumed it was responsible for the fault..

Edit; I checked the resistance across the terminals and it it varied as the temp was moved. I am not sure how best to test it with a multimeter.. Pretty sure I tested the cables for breaks from the room stat to the terminal box and all seemed ok.

I have disconnected the pump, and the fuse still blew.. I have chased around with a multimeter and can find no faults.. I suppose there is a possibility that I have bought a duff actuator, but I would imagine this is unlikely (it was new and sealed) ! I must be missing something, but I...

thought I was onto a winner with this, but finally fitted the new actuator today and it is exactly the same as before ? Hot water is working fine, but if you turn the heating on, the fuse blows. Seems really strange as it ran fine when we by-passed the valve, but with a new one fitted...

Good day today.. Fitted the new programmer. Hot water works fine. Switched the Heating on - Fuse blew. Tested the Mid Position valve - cant find any faults with it, however once removed and circuit bridged the heating and pump are working perfectly. So new Actuator required. Finally...

Right then.. New board and programmer. The hot water is no working as it should. However if you turn the heating on, the fuse in the spur blows. I am suspect of the mid position valve. Just need to know how to test it? Any help, greatly appreciated !!

:D Yeah, got a new live on it's way.. :lol:

Hi, There is no live out the back of the programmer.. So I have a new one on it's way.. Hopefully be here today or tomorrow ! I will update the thread when it arrives, but have fingers crossed..

There is continuity between the (HW on) feed on the programmer and the original live feed to the boiler.. How can I test the valves, pumps and stats in the airing cupboard ? I can't find a live in the junction box ?

Hi, After a bit of advise.. On Sunday the Boiler blew. Boiler is an Ideal Classic FF350 Programmer is a Danfoss TP715 Junction unit is a Danfoss WB12 Water had been on, and running fine. Switched the heating on, and 10mins later there was an electrical bang from the kitchen where the...