Central Heating Timer switch

[frank]

Any heating/electrical engineers on the forum. I have a Sunvic Select 107XL timeswitch for my central heating, I think perhaps it has died on me. It's only about 2 years old, I don't know the normal lifespan for one of these timeswitches.
It will just not switch on boiler, I think there is power going into the timeswitch as the clock and display is still being shown, then again perhaps it is the backup battery is keeping the display on. The programmer can be set, I have tried switch it off at plug, tried the reset button and still no joy.
What I have noticed is the display used to be illuminated at night, it no longer lights up. Trying to switch on via Allday, Auto or On settings will not cause the boiler to fire up. This problem hass occurred before but corrected itself.

Is it dead now?

Anyone know if it is easy enough to swap over with a new one, I am wondering if it is just take a note of the wiring and straightforward replacement obviously with the main switch turned off first. £36 quid out of B&Q so it wont break the bank

 

[Mike Jackson]

Not possible to tell without doing some electrical testing.

 

[Flamez]

they all share a common backplate so swapping is easy. In the meantime switch your boiler on constant and control it with the room thermostat.

 

[AllyB999]

Problem is if the fault is with the electrics and not the timer switch, could be £36 wasted

 

[Yv]

ok, forgive me, I know nothing about this kind of thing, but if its powered by a pug into the mains, as your first posts seems to imply, have you checked it hasn't just blown a fuse in the plug? The b/u battery couple be keeping display going. :shrug:
Ours is a timer/thermostat in one and is fully battery operated and needed new batteries at the beginning of winter and that had similar symptoms, it looked like it was working but was not sending a signal to boiler.

Like Ally has said, the main prob with installing another wirthout relevent tests is that its a waste if its not the timer itself.

 

[frank]

Ir's wired directly into the mains , yes via a fused plug not the socket type but a on/off switch, fuse inthere is fine .If there was a problem with the mains I think the trip switch would be in the off position after a fault occured, even when a light bulb dies it's so sensitive that I have to reset the trip switch to get lights back on again.

Strange thing though it has just fired the boiler up again at the time it's meant to come on so it appears to be a intermittent fault. maybe a sign that it's on its way out.