Hi Softus. When i rise the temperature of Cylinder stat, boiler and pump operate but no HW. When i call 4 CH , i hear a grinding noise as if the MZV were struggling to open, the lever does not budge but i do have CH.Regarding the free movement of spindle, i can not tell since i have not checked it.Softus said:
moto valves
- Thread starter dotto
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Hi Softus. I removed the power head and the spindle moves freely. How can i check if the actuator is working??Softus said:ollski said:Tell me about it!
We (i.e. you) have been at this for 48 hours, and we're only just at the second stage of the basic fault-finding process
Leave the powerhead off (but be careful not to touch anything that might be live - you could replace the cover for example), and then operate your heating controls.
See whether or not the actuator 'slot' turns - if it just makes a grunging noise and doesn't move then I'd replace the powerhead. If it makes no noise at all then you could replace just the motor, but personally I'd replace the powerhead.
See whether or not the actuator 'slot' turns - if it just makes a grunging noise and doesn't move then I'd replace the powerhead. If it makes no noise at all then you could replace just the motor, but personally I'd replace the powerhead.
I'm starting to struggle to believe that this isn't a wind-up, but I'll give the benefit of the doubt (without meaning to be condescending).dotto said:
The lever does of course move within a slot, but the slot I was referring to is the slotted hole that accepts the flat part of the valve spindle. The spindle rotates, whereas the lever doesn't rotate.
If I had a picture I'd post one, but I don't, so I can't.
This is getting silly isn't it.
I can see your simple test going wrong though Softus. If you operate a powerhead when it isn't on the valve, the bits don't sit in the right places so the gear teeth slip and you DO get a grungy noise! And the slot might not move!!
Dotto - just see if the motor turns!
You will probably have trouble getting the actuator on and off the valve even with the screws completely undone. If you operate the lever (against the spring) it'll release, and get into place, more easily.
When replacing the actuator, first get the shaft in the right place for the actuator slot to go on .
I can see your simple test going wrong though Softus. If you operate a powerhead when it isn't on the valve, the bits don't sit in the right places so the gear teeth slip and you DO get a grungy noise! And the slot might not move!!
Dotto - just see if the motor turns!
You will probably have trouble getting the actuator on and off the valve even with the screws completely undone. If you operate the lever (against the spring) it'll release, and get into place, more easily.
When replacing the actuator, first get the shaft in the right place for the actuator slot to go on .
This has never happened to me, but I bow, most sincerely, to your greater experience and wisdom.ChrisR said:
I believe that we know that it turns, because the dotto reported a grungy noise before removing the powerhead.ChrisR said:
Admirable attention to detail ChrisR, as ever.ChrisR said:
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Sorry girls, fasthosts was sabotaged yesterday
... and those with a clue seem to have answered
... and those with a clue seem to have answered
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