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Ermostat manual T641A

I have a Honeywell T641A and would like to to see wiring Diagham for when it is on heat and then cooling Heatpump system with Ax Elec heat

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Ok sir can you tell me your main problem?

Posted on Oct 16, 2007

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Posted on Jan 02, 2017

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Replacing chronotherm with new rth7600


R= power in G= fan Y= cooling W=heat O= heatpump reversing valve C= common used for clock on chronotherm Usually its pretty streight forward wire for wire. Unless you have a heatpump. The thermostat has to be heatpump compatable. And I ll usually use the 8000 for this. The w and y jumper may not be necesary on the new thermostat as the new one should do it internally once programed as a heatpump thremostat. At least thats how the 5000 and 8000 sreies work. So imagine the 7000 would be the same. You may also have to program the reversing valve operation not all manufactuers do it the same . Some valves have to be powered for heat while others have to be powered for cooling. Good luck

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Honeywell Thermostat RTH6350 makes heat run in AC mode after AC runs


Well, if it wasn't doing that before then you more than likely know its in your wiring. Cools down then heats back up sounds like the auto change over is on, and the heat setting is higher than the cool setting?

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Had electrician install RTH2310B Honeywell thermostats but am getting no heat


check to make sure that it's wired correctly. R(red)power, G(green)common, Y(yellow)cooling, W(white)heating, O(orange), E(emergency)heat. Make sure that you have the correct thermostat because there is a heatpump thermostat and there is an air condition thermostat and they are wired differently.

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1 Answer

I Have a honeywell RTH2410 Thermostat I wired it without the blue wire which used to go to X on my old thermostat. Now it comes on with aux heat all the time and I have a Heat Pump. How can I fix this?


What was the old thermostat labels and the wire colors that went to them?
The typical heatpump wiring Terminals are:
R = Red = Hot side of Transformer
C-B-X = Common side of transformer Depending on brand of heatpump
Y = Yellow = Cooling Contactor
G = Green = Furnace Blower
O = Orange Reversing Valve Energize to Cool
B = Blue Reversing Energise to Heat Depending on brand of heatpump.
W2 = White = Auxiliary Heat
You need to be sure where each wire comes from when you connect them to the new thermostat.
The best way to do that is to go to the furnace and see where they are connected. R-Y-G are probably correct, you need to see where the Blue wire comes from and determine what the X terminal was on the old thermostat.

Dec 29, 2009 | Honeywell Electronic Programmable...

1 Answer

Old wiring looks like this yellow =y1 green =G white=w2 orange =O blue=C red=R installing a Honeywell RTH7600 where does the orange wire go we have a heatpump.L


If you have a heat pump, the thermostat that will operate it most generally will have an "O' terminal for the orange wire, this is the circuit that energizes the reversing valve on the heat pump, be sure that the stat says heat pump on the box. hope this helps

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2 Answers

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your trane heat pump energizes the reversing valve with O - orange y - is to turn on the unit make sure you have your orange wire hooked up and the tstat programming set to heatpump otherwise your reversing valve might be bad

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Looks like your system is a heatpump system and that t-stat will not run a heatpump , you need a t-stat for 2heat and 1 cool systems

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You need to go into the installer setting to change it from heatpump to single stage gas heat.Go to www.honeywell.com if youve lost them.

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1 Answer

Went from Analog thermosat to a Honeywell 5000 series Digital Thermostat. Worked fine all winter. Now, when I put it on Cool it pushes out Heat. This is a Trane Heatpump.


Look to see if you have it wired correctly with the o terminal be used and then check to see if you have a jumper wire between the Y and W terminal on the Base of the tstat where you hooked all the wires up.

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