I need to replace my old thermostat, which is cracked, and have bought a new one. The problem is that it isn't clear where the power source is supplied from, so I am having problems safely isolating it. Any tips, please?
Thermostat wiring problem
Nov 22, 2005
4 Replies
The big main switch on the consumer unit.
Test your electrical tester against a known live source.
Switch off.
Test your thermostat wiring for dead.
Test your electrical tester again against a known live source.
Owain
(Spot the deliberate flaw in this procedure.)
I presume you're talking about a room thermostat which controls the central heating?
If so, the whole heating system - boiler, pump, zone valves (if any) - should all be fed from a single FCU. If you find that and switch it off, the stat should be safe to work on - but check it with a mains voltmeter (*not* a neon screwdriver!) anyway.
attach voltmeter, pop breakers until it goes off. And if you dont know that, leave it alone.
NT
Thanks guys, its obvious really. Mike
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