Hi hopefully someone can help me out a bit here. I've had a search and done a bit of reading up on the subject, but need to ask a few specifics so here we go.
I think I have a problem with the motorised valve on my central heating which is causing the downstairs radiators to stay cold when the hot water is on.
Before I dive in and get a replacement, I would like a bit of advice / confirmation.
My motorised valve is a 3 port Honeywell with the number F4-9511, and it currently (mis)behaves as follows:
The only time I see the lever on the motorised valve move is when (with CH and HW off on the boiler controller) I push it over fully to the open position, then turn the HW on. The lever moves straight away to around the middle position. After this has happened, it stays there, regardless of whether CH, HW or both are on.
If I turn CH on with it in this middle position, the downstairs radiator is cold.
If with both CH and HW on, I then move the lever to the open position, it stays there, and the rad heats up.
I can also get the rad to warm up by turning off the HW. The lever still doesn't move from wherever I position it, but it doesn't seem to matter where it is, the rad still warms up if CH is on and HW off.
The lever never moves towards the open end, unless I put it there.
Hopefully someone's still with me...
As the boiler control only allows me to set the timer for both HW and CH together, I obviously would like the rad to be warm, whilst also heating the water, which is how it always used to work.
Does this sound like a faulty motor unit (which is what I leaning to), or something else? Are there any other diagnostic tests I can do? Pretty sure the pump is working, as I can hear it, and as I say, it is possible to get heat into the rad - just not with the hot water on.
And one more thing, if it is the motor unit, could someone point me in the direction of a suitable replacement, as I can't seem to find one with a matching part number.
If any more info is needed, I'll try and provide it. Thanks in advance!
I think I have a problem with the motorised valve on my central heating which is causing the downstairs radiators to stay cold when the hot water is on.
Before I dive in and get a replacement, I would like a bit of advice / confirmation.
My motorised valve is a 3 port Honeywell with the number F4-9511, and it currently (mis)behaves as follows:
The only time I see the lever on the motorised valve move is when (with CH and HW off on the boiler controller) I push it over fully to the open position, then turn the HW on. The lever moves straight away to around the middle position. After this has happened, it stays there, regardless of whether CH, HW or both are on.
If I turn CH on with it in this middle position, the downstairs radiator is cold.
If with both CH and HW on, I then move the lever to the open position, it stays there, and the rad heats up.
I can also get the rad to warm up by turning off the HW. The lever still doesn't move from wherever I position it, but it doesn't seem to matter where it is, the rad still warms up if CH is on and HW off.
The lever never moves towards the open end, unless I put it there.
Hopefully someone's still with me...
As the boiler control only allows me to set the timer for both HW and CH together, I obviously would like the rad to be warm, whilst also heating the water, which is how it always used to work.
Does this sound like a faulty motor unit (which is what I leaning to), or something else? Are there any other diagnostic tests I can do? Pretty sure the pump is working, as I can hear it, and as I say, it is possible to get heat into the rad - just not with the hot water on.
And one more thing, if it is the motor unit, could someone point me in the direction of a suitable replacement, as I can't seem to find one with a matching part number.
If any more info is needed, I'll try and provide it. Thanks in advance!