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Replaced thermostat on FA4ANF030 with Honeywell model rth3100c does not work

Please help us find the possible cause of replacement thermostat not turning on either air conidtion unit outside, nor the air handler inside.
Air handler: Bryant FA4ANF030 and new thermostat Honeywell RTH3100C

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  • DerekS Dec 14, 2007

    I kind of have the same problem. I have a red, white, yellow, white, and orange. I also have a black a blue and a brown which were not used on the AC unit but they are there tucked away.

    My problem is I don't know who labeled this unit last and did they know what they were doing because none of the wires are labeled Aux. So what do I do?

  • Anonymous Sep 13, 2008

    don't know where to pu jumper on hw 3100 terminals on new unit are

    E, AUX, Y, G, O, L, R, B, C

    i can figure out red yellow and green. what do i put the white wire on and where do i put the jumper?

  • Weasel252 Dec 14, 2008

    My old unit has the W1, W2, and the Y wires. It states to call a contractor. I have, and they do not know the answer. Do I use the W1 or W2 wire for the AUX, and what do I use for the B wire. My old unit does not have one.

    Thanks,
    Chris

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If you have a newer t-stat your heat pump reversing valve is either o or b depending on the type of system you have

Posted on Dec 19, 2007

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I had the same issue and called the manufactor and they new exactly which wires went were. The manual that came with the thermostat was incorrect.

Posted on Jun 26, 2008

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If you have a heat pump do not put your blue wire on b. Put it on x or c. If you don't have an inline fuse you may have blown your transformer.

Posted on Dec 04, 2007

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4-wire typical wiring of a thermostat is: Y (Yellow) G (Green) W (white) and R (red). Inspect the thermostat to see if it has a jumper from R1 to R2. If not, put your red wire on R2. On a 5-wire thermostat you may have a blue wire. This will go to the common terminal (usually C but sometimes B) check the inline fuse in the air handler to see if it has blown. Replace it only after wiring the thermostat correctly.

Posted on Dec 03, 2007

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3 Answers

My Goodman heat pump doesn't blow air through the vents into the house, but the fan comes on when the thermostat is turn on for the air conditioning


Check first that
  • the air conditioning equipment is turned on,
  • the thermostat is calling for cooling, and that
  • the blower unit or air handler is actually blowing air through the ductwork.
Here are the details of what to check in what order if your air condtioner or heat pump doesn't start at all when you set the room thermostat to call for cooling:
  1. Check the Room Thermostat Temperature Setting: Set the thermostat to at least 5 degrees below room temperature. Our elderly mom has no patience with switches and controls. She regularly calls her air conditioning service company with a service request, sometimes late at night, because she has simply failed to set the temperature on the thermostat lower than the room temperature. Don't drive your A/C like our mother.
  2. Check that the Room Thermostat is set to "Cool" not "Off" or "Heat". If the thermostat is not set to "cool" it is simply turning off your A/C. If the thermostat display is blank then it's not receiving power (for modern digital thermostats). Check that electrical power is on at the air handler and to the the low-voltage transformer that supplies power to the thermostat.

    If the thermostat has power, check that when you set the thermostat temperature down at least 5 degrees below room temperature the thermostat calls for cooling. If it doesn't then check for broken or shorted thermostat wires anywhere between the wall thermostat and the control board at the air handler.

    You can easily eliminate possible thermostat problems as a cause of failure of the air conditioner to start by simply eliminating the thermostat from the picture: disconnect the thermostat wires at the blower unit's control board and instead connect the two thermostat terminals directly together with a jumper wire. If the system starts then the problem is in the thermostat itself or in its wiring.

    If the thermostat is working but the compressor condenser unit won't start, you could skip ahead
    to COMPRESSOR / CONDENSER DIAGNOSTICS but I wish you'd double check the remaining steps in this article first because there are some sneaky snafus listed below that might still be the problem.

  3. Check that electricity is on for the equipment. Check all of the electrical switches and controls that can turn electrical power off at the indoor air handler or at the outdoor compressor/condenser unit. There are more of these switches than you might guess. Here's a list of what to check:

    Electrical power switches and service switches outside by the compressor, inside at the air handler, and fuses or circuit breakers in the electrical panel. Don't forget to check that the access covers to the equipment are properly closed and latched. Otherwise a
    BLOWER DOOR SAFETY SWITCH could be keeping the equipment from running.

    There are several other safety switches and controls, both manual and automatic that can leave an air conditioner or heat pump turned "off" such as a blower compartment door interlock safety switch, an electric motor overload or overheat switches, and a condensate tray spillage detector switch.

    Some hard-to-find electrical switches on an air conditioner or heat pump could be keeping your air conditioner from starting, such as
    a FLOAT SWITCH on Condensate Tray that could
    be
    causing CONDENSATE PAN SWITCH LOCKOUT - condensate spilling into an overflow pan that uses a sensor switch can be enough to shut down your air conditioner.
    or
    a blower MOTOR OVERLOAD RESET SWITCH could be keeping a fan motor from starting.

    A bad or failed starter capacitor could also be leaving your system shut down, failing to start a blower, fan, or compressor motor.
    See CAPACITORS for HARD STARTING MOTORS

    Watch out: See A/C - HEAT PUMP CONTROLS & SWITCHES to be sure you have found and checked everymanual or automatic electrical switch on the system.
  4. Check the electrical supply voltage. Even if electricity is on, if the supply voltage has fallen too far below the operating voltage range of your air conditioner it's likely that the system will not operate, particlarly, you may note that the compressor motor won't start.
    See VOLTS MEASUREMENT METHODS

Aug 22, 2017 | Goodman Heating & Cooling

1 Answer

I have a rth3100 that i installed programed it ac came on the next day went off and wont come on it was cycling on and of. After new one was installed dont have power to it


http://www.ps2netdrivers.net/wiring.diagram/honeywell.rth3100c/

Here you can find all about Honeywell RTH3100C like wiring diagram and other informations. For example: thermostat wiring diagram, installation manual, installation, thermostat, wiring, manual.

Honeywell RTH3100C manual (user guide) is ready to download for free.

Apr 27, 2015 | Computers & Internet

1 Answer

How do I fix my Trane air handler to keep it from turning off about 20 seconds after being commanded to turn on?


Some units require both a start and a run capacitor. It's possible the wrong capacitor was replaced. It's also possible to add a run capacitor to a system to keep the fan running. There is an outside chance the bearings in the fan motor are worn to the point it's time to replace the motor.

Mar 29, 2015 | Heating & Cooling

1 Answer

My air handler fan does not come on, the outside unit turns on fine. Is their a way to reset the fan?


Check for fan operation by turning the fan control at the thermostat to "on". If the fan blows, it works. If not, check a circuit breaker or fuse.

If the fan blows when forcing it on with the thermostat but not in automatic, check the fan control circuit in the air handler. Danger: high voltage, beware! There should be a system wiring diagram inside the air handler somewhere.

Mar 30, 2014 | Rheem 4 Ton Air Handler - RHLLHM4821JA

1 Answer

RTH3100C thermostat for an older Lennox heat pump


well the wire on x will go to e thr r is the red wire goes to r the wire on f willgo to g the y will go to y now the rest you'll have to verfy at air handler o will go to reversing valve common wire will go to c the electric heat will go to aux

Feb 06, 2014 | Honeywell RTH3100C - Digital Heat Pump...

1 Answer

Changing From Trane to Honeywell


Color ---> New stat terminal

Blue--------C
Green------G
Yellow-----Y
Orange----O
Red---------R
White------E and Aux.
Tan---------unused, tape and secure it

If there is Rh and Rc or R and Rh, these terminals should be jumpered together.

I used to install Weathertrons eons ago. Whatever you do DO NOT connect the blue wire to the B terminal, you will short out your low voltage transformer immediately when you switch to heat

Jun 13, 2013 | Honeywell RTH3100C - Digital Heat Pump...

2 Answers

My A/C freezing its coils, while the fans keep running. The AC unit (outside) keep running and never stop caused the coils freezing. It doesn't matter when I turn off or set it to Cool position, the...


Sounds like the contactor in the condensing unit is stuck. That is why it will not turn off when the thermostat is satisfied. If the inside air handler is not blowing and the outside condensing unit is running, then this will cause the inside coils to freeze up rather quickly.
The contactor is located in the outside condensing uni in the electrical compartment.
If it is sticking it will need to be replaced.

Sep 07, 2011 | Heating & Cooling

2 Answers

I have a T3BA-036KA the outside unit will not


You need 24 volts going to the coil of the contactor. If you do not have 24 volts, you will need to trace the wiring back to see where you are losing it from. Try placing your voltmeter at C & Y coming from your air handler. If not, go to your air handler and test for 24 volts ac at C & Y coming from your thermostat. If you do not have 24 volts coming from your thermostat, there is either a problem with the thermostat or there is a problem with the wiring between the thermostat and the air handler. If you have 24 volts at the air handler coming from the thermostat but you do not have 24 volts at the outdoor unit coming from the air handler, then you have a problem with the wires between the air handler and the outdoor unit.

I hope you find this information to be very helpful to you moving forward. Please leave a rating. :-)

May 10, 2010 | Intertherm P3RA-036K Air Conditioner

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