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https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl DIY Forum >> Plumbing Questions >> Honeywell central heating switch valve https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl?num=1306229185 Message started by londonman on May 24^th, 2011, 10:26am

Title: Honeywell central heating switch valve
Post by londonman on May 24^th, 2011, 10:26am

I have two of these fitted (c 18 years ago).

One seems to have a problem - the one feeding the domestic hw cylinder. The manual slide lever is loose....which normally means that the valve motor has been energised and the valve opened (which it hasn't as the ch system is switched off).

When I switched the ch on and asked for hw, although a quick mains test showed volts going up to the valve, no sound of the motor running up nor any volts coming back from the valve 'open' position (used to fire up the boiler/pump).

Is this indicative of a faulty motor or faulty valve?

Title: Re: Honeywell central heating switch valve
Post by thescruff on May 24^th, 2011, 11:24am

20 years I would consider changing the lot.

If the silver case has a dimple on the top, you can change just the actuator, or test the motor if you want to mess about and waste an hour.

Title: Re: Honeywell central heating switch valve
Post by londonman on May 27^th, 2011, 7:31am

Thanks for the help, Scruff. Will look into how easy/difficult it's going to be. Bit of inconsiderate boxing in by yours truly to consider.