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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Posted on Jan 02, 2017

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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.

Try this: Remove the blue wire and jump the RC to RH with the red wire and you will be fine. Blue wire should not be needed with the new thermostat.

This should also be stated in the instruction manual.
Hope this helps.

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