Question about Honeywell Programmable Thermostat Heater

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I've just replaced our old dial thermostat with the RTH230B,but the heat isn't kicking on. It's a 2 wire system, and I installed exactly as the instructions said. Any ideas?

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Hopefully the instructions told you to hook the two wire to the Rh and the W terminals. Double check that. Also sometimes the way the terminals are labeled it is easy to get then mixed up. If you are on those two terminals and the t-stat is programmed properly then it should be starting your furnace when you set the temperature higher then the set point.
If not it could be that you got a bum t-stat right out of the box, Yeah, it does happen on occasion.

Posted on Nov 17, 2009

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Normally, you should have 5 color wires: W-White, Y-Yellow, G-Green, R-Red and C-Blue.

The Blue wire is a common from the transformer on older systems, which is probably hooked to RC terminal.

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This should also be stated in the instruction manual.
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