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thank you very much for your reply. if possible , do you mind giving me some tips or ste-by-step guide on how to re-seal it?

hello, the air vent on one of my radiators has become quite rusty, as shown in the photo below. Appreciate for advices on what sort of things has gone wrong with my heating system? or if there is any diy job that I can do to get rid of the rust? many thanks for your help.

thank you seco and Happy Easter I will then go ahead to order a new actuator.

just to make sure that I get this right. The valve pin does move. but I feel I have to use reasonable force in order to turn the pin. does this mean "move freely"? With actuator put in place, the actuator lever can return to W position by itself from H position.

ok. it can turn lockwise a little and can turn to anti-clockwise a little bit.

the pin only moves in small angle / degree. it does not turn a circle. is this correct?

I have put it back on now since I do not have a new actuator at the moment. I only bought a replacement motor today. I should certainly follow your advice when I get a new actuator. I am glad that I've learnt so much from you. Thank you.

thank you again. now I have lift the actuator up. this means I can replace it with a good one.

I can see the lever go under the plastic case, but I do not see any clips. do you think if I have older version valve? the black lever clip at back of actuator casing looks like this:

yes, at the right side there is a plastic lever, extending into the back of the actuator. The W/M/H lever is at the bottom. Sorry. I am not sure which 'top' I can pull? I have already taken the cover off (undone one screw). do you think if my actuator is older version?

thank you for getting back to me. yes, you did say that it could be pcb faulty. Perhaps I should get a new actuator. How easy to replace actuator?

I still need some help please. today I have managed to buy a new motor and have replaced the existing one. seems to have the same problem that it does not respond to heating call. does this mean that there is something else wrong my actuator? when the power is off, the lever returns to...

thank you very much. you are a star. yep. if I can not find a motor, perhaps will buy a new actuator and use its motor to replace mine. the power lead to motor needs a special rectangular plug.

I have removed motor. but how can I put power to it to test if it is working. where do you think I can get a motor to replace it if mine is knackered.

I have unscrewed two screws. can I just pull the motor out? is the casing part of the motor? The motor fitting seems quite tight.

that's good. thank you for guiding me through it. what should I look for to know the motor is ok or knackered?

I am home alone today. but I have had another go turning stat to max. the readings are below (with black probe to casing), white wire: 247 v 1st wire (orange) : 0 3rd wire (orange) : 90 2nd wire (blue, neutral) : 0 4th wire (orange,live from wall): around 60 how easy to replace...

that's right. no voltage. (the timer is still on) there is no voltage between two orange wires either.