On 13/03/2014 16:44, bert wrote:
Tends to stick on leaving boiler and pump both running even though timer
and thermostat are both off. Honeywell 272848 Is it likely t be
recoverable or is it a replacement job?
Tends to work if I thump it.

Is the valve itself stuck open[1] or is it just that the auxiliary
contacts are stuck closed.

If the former, remove the actuator[2] and rotate the spindle of the
'wet' part of the valve back and forth to free it. If that doesn't work,
it's new valve time.

If the latter, you can replace the micro-switch, but it's a bit fiddly.
Otherwise, replace the actuator.

[1] If the valve is stuck open, the manual lever will move freely with
no resistance. If the gears whirr when you move the lever, the valve
isn't stuck

[2] Assuming it's not a very old one which gives you a flood when you do
that
--
Cheers,
Roger
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