Question about Honeywell Programmable Thermostat Heater

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My heating/cooling sys. is electric. I just installed the RTH2300. My original stat was wired as follows R-r, G-g, W-c, B-o, Y-y(with yellow jumper to W). The new stat is wired as follows B-o,Y-y,R-r,G-g with the W removed. Do I need to re-run the Y jumper? My fan isnt kicking on in AUTO only in ON position. Thanks for your time

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  • wyazgypsy2 May 30, 2011

    I did re-run that are correct, it made no fan difference. I did notice that after re-powering the unit the stat diaplayed 85deg. This was way off..I disconnected the jumper and all is working fine now. Im confused but accept the outcome! Thanks.



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Yes, I would rerun the Y jumper... but that probably will not solve the fan issue...that fan runs off of the G wire...
Do you have the th2300 programmed for heat pump??? If not you need to go into the advanced setup and re program it to run a heat pump...
To double check that the G is wired right... jumper R to G and the fan should start... if not then there is another problem...


Posted on May 30, 2011

  • D. Floyd Kolb
    D. Floyd Kolb May 30, 2011

    Check that all connections are may have had a loose connections somewhere... also I have had to restart t-stats already because they mess up on the first start up...not unusual...




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I just purchased a house with brand new furnace wired to a RTH2300 Honeywell thermostat. It only has two wires running to it. I can't seem to get it to work in "manual mode"-where I set it on...

?? Connect Wires 5.

Labels don't match?

If a wire does not match any terminal on the thermostat,

see next page.

Quick Installation Guide


Alternate Wiring

If a labeled wire does not match any terminal

designation, see diagram below.

Do not use C, C1 or X wire. Do not use B wire if you already

have O wire. Wrap bare end of wire with electrical tape.

This thermostat cannot be used if your old thermostat had

any two of the following wires: R, RC, RH, 4 and V.

Place a jumper (piece of wire) between Y and W if you have

a heat pump without auxiliary/back-up heat.

?? Connect Wires (cont'd)

Programmable Thermostat RTH2300


Set jumper JP1, on the back of the thermostat, if you

have connected a wire to the G terminal.

Incorrect jumper setting: An incorrect setting is

noticeable in a gas or oil heating system. When heating

starts, you will initially feel cold air coming out of the vents

as the fan is running before the furnace has enough time

to heat up the air.

?? Set Heating Fan Control 6.

HG Leave the jumper in this factory-set

position if you have a gas or oil furnace.

HE Place the jumper to this position if you

have an electric furnace.


Quick Installation Guide


Set jumper JP2, on the back of the thermostat, if you

have a heat pump.

Incorrect jumper setting: The heat pump operation

will be reversed, i.e., it will cool in Heat mode and will

heat in Cool mode.

?? Set Heat Pump Reversing Valve 7.

O Leave the jumper in this factory-set

position if you have connected O wire to

the O/B terminal.

B Place the jumper to this position if you

have connected B wire to the O/B terminal.


Programmable Thermostat RTH2300


1) Install 2 AAA

batteries on the

back of the


2) Align the two

brackets on the

top of the

thermostat with

the corresponding

slots on the top of

the wallplate.

3) Push the


against the


4) Tighten the screw

at the bottom of

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5) Turn power back

on at the heating/

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A/C, Heating, & Refrigeration Contractor.

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