Hot water issue

drdino · 20 Sep 2020

Hi guys!

I realised I've got a hot water issue (fortunately not while in the shower!). My flat has communal heating for hot water/central heating (supplied by Eon). The system comprises a Honeywell RWB29 controller, a room thermostat, 2 diverter valves and a pump. When the room stat calls for heating, the relevant valve opens and the pump is started. When the controller asks for the water to be heated up though, the valve doesn't open and the pump isn't switched on either.

As such, I think there's no issue with the communal heating side of the system but rather with the flat's, right? Is the pump switched on only if the valve is confirmed to be open or does the controller not care about their individual states? To me it sounds like either a valve or a controller issue but I'm open to other suggestions.

Thanks!

(links removed)

numerous links to "pistonheads" website removed

drdino · 20 Sep 2020

Apologies for the links, fat fingers when pasting.

Just to add, the pump runs momentarily when I push the manual lever on the HW valve quick enough. That points to a duff syncro motor, right?

dilalio · 20 Sep 2020

I think you mean 2port valves, not diverter.
What models are they?
New synchron or new actuator.

drdino · 20 Sep 2020

Indeed, two 2port valves.

Honeywell 4000 3916-001 is the hw one.

oldbutnotdead · 20 Sep 2020

You renting? If so its landlords problem, otherwise as above almost certainly failed motor (though you'd be wise to check the controller is actually sending power to the motor before splashing out). Suitable DMM. will cost you about £10

drdino · 20 Sep 2020

I'm renting but for the sake of 10 quid and with the whole covid situation I might as well replace it if they're ok with it.
Tomorrow I'll check if it's getting a signal from the controller and take it from there.

Thanks for the help gents.

oldbutnotdead · 20 Sep 2020

Not sure how much the decent motors are these days (not needed one for 20 years, don't buy the Chinese cheapies, they're dreadful) and be wary, you are exposing yourself to liability if you start playing with the valve heads.
Agreed replacing those motors is a very simple straightforward job but if (for instance) you get a dud that goes on fire one night there could be consequences for you. Big fat financial and legal consequences.
Def contact your landlord, if they can't offer a speedy resolution (24 hours is reasonable for hot water) then suggest you fix it but they need to indemnify you and pay for the parts.

drdino · 20 Sep 2020

Sounds like a plan, cheers!

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Hot water issue

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