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I did the lever test. There is no difference between the resistance of the lever when the system is off, and when it is turned on calling for CH and HW. This would therefore point to a faulty motor ? A couple of points here though. 1. The motor is not open circuit, is it still...

Just CH. I.e. Just the CH button switched on on the programmer (+ room stat all the way up). HW button on programmer turned off. Boiler does not fire up. If I switch HW on, (with or without the CH button) on the programmer, the boiler does fire up. I will carry out the test you...

Thanks for your reply. This procedure looks as if it will just change the motor/housing unit is that correct ? 1. What if the problem is in the electronics which is left fastened to the valve (i.e. part of the same plastic unit which contains the levers). How can I change this without...

Thanks for the info chaps. If I move the top level right over the boiler fires up and the CH pipe from the valve gets hot. Can I assume the valve is not stuck, and this is a motor or actuator problem ? I cannot turn the spindle (to slim to grip by hand), but if I move the levers it...

Results from CH test white and grey tied to permanent live. I am not sure how I can tell if the valve has moved. What I can say is that the override lever(s) sticking out of the actuator did not move, the boiler did not light. However there was an oscillating noise which I assumed was...

Thank you for your speedy and clear reply. I will carry out the tests and post back with results and picture of motorised valve.

The system is about 9 years old, fitted in a domestic residence, and has worked fine up until a few days ago. I believe it is a Y Plan system. It has a tank in the airing cupboard and a T shaped valve fed from a pump. One side of the valve goes to the tank, the other to the 14 radiators. Boiler...