[SOLVED] Big (overnight) water heater ceased functioning - manual says there's a cut-out button

[MoreMoschops]

Thanks very much. No fear of me doing any replacing myself; that's what the landlord is for! I'm always happy to take the simple steps and the simple measurements, though. If it doesn't cut out again and all seems well, might write "cutout" next to the little rectangle with a chinagraph pen for the next guy.

 

[OwainDIYer]

I'm actually renting, so it's not going to cost me, but I've no interest in alienating the landlord whom I have seen precisely once over the last ten years.

Landlord should be providing an annual safety check to comply with Building Regulations for unvented hot water cylinders.

 

[MoreMoschops]

Well that's something to bring up with his agent next week.

 

[Taylortwocities]

As above. If you were to want to test it further…
With the Off-peak supply energised you should see 230v between A and B, that's the terminals at 3 and 6 o'clock on the housing.

You should also see 230v between the two test points (marked 1 and 2) in the centre of the housing. Those points are directly across the element itself and you can use those to eliminate/investigate the cut-out or the thermostat not functioning.

 

[MoreMoschops]

I turned the economy seven switch back on a moment ago and heard something starting up inside the tank, so it didn't just re-pop the cutout instantly.

 

[Echo the husky]

The cutout is a high temperature cutout. I wont trip until the water temperature reaches a certain level, perhaps 85-90C.

 

[MoreMoschops]

Ah... so if it does trip, might I get somewhere by experimenting with that turny switch? Is that some kind of target temperature setter?

 

[Echo the husky]

No, if it trips it's faulty and needs a new thermostat, replacing it takes only a few minutes.

 

[MoreMoschops]

Fair enough. If it trips, it's one for the landlord.

 

[MoreMoschops]

Well that all seemed to work out pretty well. Didn't trip (I think), plenty of hot water. If it trips again in the near future I'll call up the landlord, but otherwise all's good. Many thanks.

 

[Taylortwocities]

Always good to get a result!!