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Please bear with me on this. From the earlier values posted I had concluded the H/W value was indeed the problem. I was just looking for some confirmation before I change out the unit as it is in a fairly inaccessible location. I just thought there may be some standalone test, say for...

Just an update; I have put the meter across the various leads and these were the results; Brown - Blue. picking up resistance. Orange - Grey. picking up resistance. Nothing for any other combinations.

I have had a fresh look at this today. One of the valves (the suspect one) is tucked away in the airing cupboard and not easily accessible. However, while it appears identical to the Honeywell V4073 on closer examination I now discover it is in fact a Landis & Staefa; Part code ZAV-222, BG Code...

Does your actuator cover have a small bump on the top at one end? They are both V4043H, the faulty one is the newer of the two and it has, what could be best described as, a dimple on the top edge of the cover. Its construction is different to the older one in that it appears to have three...

So hopefully I can get a replacement power head for the C/H valve, thus avoiding a system drain down. I will probably replace the Timer Controller at the same time as the noise is becoming too much. From what I have seen the Danfoss Randall 4033 looks pretty similar (same back plate), with...

Once again many thanks for your help. Well the terminal box is like a birds nest. This is what I have established I hope it make sense; Warning: The Orange wires may be LIVE - Yes they were live. Measure voltage between Brown and Blue for both valves - should be 240Vac. 0Vac...

Thank you for your prompt response. Do you mean with the HW and CH both set to OFF? -- Yes. Both OFF. Do you have (and know how to use) a multimeter? ---I have got a rather old one not exactly proficient in its use though.

My existing Randall 3033 Timer Controller unit appear to be in a state of decline. It’s become very noisy but more important is the fact the boiler has started to fire up when the power to the controller is switched on. My system comprises; Baxi Solo 2 RS50. Randal 3033 Timer Controller. 2 x...