Honeywell 4043

[Andy Cap]

Should opening it manually operate the microswitch ?

I've always assumed it did, but have just bought a replacement head and with the lever fully over, the operating plate is about 2mm shy of the switch, let alone when dropped back into the catch.

So is it just supposed to open the valve?

Andy Cap

[Peter Parry]

I'm pretty sure they only open the valve. I had one with a dead motor and using the manual opening lever did not trip the microswitch.

[Dave Liquorice]

Don't think so, the manual opening is just that to facilitate filling/draining/bleeding without having to have power. You wouldn't want say a pump and/or boiler to come on without the system fully primed...

[Andy Cap]

Thanks both. No, that makes sense. ;-)

Andy C

[fred]

Defo confirmation, the microswitch is only operated when the motor operates the mechanism, not on manual.

[The Natural Philosopher]

That's my vague reollection too.