Question about Honeywell Programmable Thermostat Heater

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RTH230B Thermostat I've been told that after I installed the thermostat that it did something to the transformer. Where is that located and how to fix it?

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The transformer may be installed remotely to the furnace or may be a part of the honeywell burner relay. if you connected the thing between the transformer secondary common and hot it will surely blow the transformer.

Posted on Feb 03, 2008

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Hello. Our RTH230B thermostat has a mind of it's


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I am changing from a Seco control thermostat model # tb1540e-g to


Rc/Rh should be from the transformer if a single transformer system. If its'a dual transformer system, then there should be a red wire to each from it's respective unit (furnace=Rh, condensor=Rc.).
W should be heat.
Y Should be cooling.
G should be fan.
I am not certain what E is, unless the stat can be used on a heat pump with backup electric heat, in which case it's for the electric heat.

The reason I say should be, is because if you are looking at wire colors, and not terminal designations, there is no guarantee the control wiring was connected following normal convention.

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Mar 07, 2008 | Honeywell Programmable Thermostat Heater

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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.
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Feb 03, 2008 | Honeywell Programmable Thermostat Heater

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