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diezeltruck

Quote:

Originally Posted by Roger

The message
from The Wanderer contains these words:

It has been suggested that I have a faulty motorised valve which is
stuck in the 'on' position.

That alone won't give rise to the symptoms you describe. If the system has
been wired properly, then the controller overides any other auxiliary
switches (like the thermostat, the aux switches on the valves) in the
circuit.

I don't think that follows. Surely the microswitch on the valve is fed
from the permanent live and the controller provides a switched live for
the thermostat. (That is certainly the way my controller should be
wired).

If the system worked properly once and the wiring has not been disturbed
a miss-wiring fault should not be present.

To the OP if the valve is difficult to move then that is the likely
culprit but it is the wet part that is at fault so you will have to
change the whole unit. The actuator can be tested easily enough by
seeing if the symptoms persist while the actuator is mechanically
disconnected to the valve which should, if faulty, remain open when the
actuator is disconnected. If the actuator is not faulty the thermostat
should then control the firing of the boiler.

--
Roger Chapman

Thanks Roger! You're confirmation of what i'd thought was right and the Wanderers advice was incorrect

How could it be a wiring problem if the sysem has been working for the last 8 years without any probs and no wiring altered?

Having removed the actuator attached to the valve and manually turned the valve using my fingers hopefully freeing it and replacing the actuator appears to have solved the issue.

I've been on hols for 3 weeks and the CH has been off causing the valve to seize up.

Turning the valve does appear to be a little stiff and jerky but hopefully now the system is up and running it should stay that way.

Thanks for your sound advice

Diezel