I have one of the small square ones from Screwfix fitted at my daughter's
Had a anguished call to say that the heating was stuck on and had reached 28
Fiddled around and eventually swopped the batteries. It now works.
Was it due to the fiddling with all the settings - or do the contacts 'fail'
in the closed position if the batteries weaken?
The relays in these are latching (magnetically assisted I think) and so if
the batt fails when on demand then it won't have the oooomph to reset the
The Horstmann looks like a pattern match for a Tower one I have as a
temp solution and I don't hold that one in high regard.
Yeah. I bought one of those, but never fitted it in the end. It sticks out
of the wall too much, looks a bit cheap and I couldn't work out how to
manual override the thing. (I'd lost the instructions).
If you're still interested, you override by pressing one of the arrow keys
until the displayed demand temp blinks once, then use arrow keys to set
desired override temp. Resets on next program step - easy huh ;-)
Btw, thanks for the Sunvic recommendation, could be a suitable stop gap
At the risk of sounding like you know who (and whatever he's just been
I still recommend the Centaur Stat 7 - less than 30 quid.
4 temperatures per day.
2 sorts of day assignable to any days of the week.
Easy + - buttons to override.
Lock button for going away for w/e hols etc.
Much easier to program than any other I have tried with similar
Screwfix part 12517 (iIRC).
Even these controls are too complex for about half the customers.
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at www.diyfaq.org.uk
They don't have a conventional relay but some form of 'motorized' switch -
this is needed to save battery consumption. Hence the loud - and annoying
- noise when it operates rather than the relaxing click of a relay. So I'd
guess it might fail in either mode when the batteries die.
*I'd kill for a Nobel Peace Prize *
Dave Plowman email@example.com London SW 12
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