Question about Honeywell Electronic Programmable Heat/Cool Thermostat - CT3300A100 Heater

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Honeywell Thermostat I have a honeywell CT3611 thermostat and a york heat pump (E2CS030A06A) and I'm having problems with the fan and auxillary heat turning on and off to maintain the indoor temperature. My indoor unit has wires connected to C,G,R,W1,W2 and my thermostat has wires connected to C,R,W2,E,W1,Y,O,G but no wires to B,L. I followed the guide for the thermostat wiring however the fan does not work when I place the control on "continuous" and the aux/supplemental heat does not turn on on the indoor unit eeven though the thermostat indicates it's on. I checked my aux/supp coils and they are working fine. I have not chaged anything on the heating system except the thermostat. Someone please help.

Posted by vasilios_pap on


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Bill Long

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Make sure G from indoor unit goes to G on thermostat for fan continous fan, if that doesn't work and you have 24 volts to R and C then the t'stat is bad.
For 2nd stage heat or aux.heat, on the indoor unit you need to make sure the wire W2 from the indoor unit goes to W2 on t'stat.
You don't need any wires from W1on the indoor unit to W1 at the t'stat because with a York heat pump Y1 is the contactor which turns the compressor on and you will get 1st stage heat, and for cooling the t'stat will also bring on O which is the (reversing valve) or cooling changeover relay for the cooling mode.
C = common usually black wire
R = hot usually red wire
Y or Y1 = contactor
W1 = 1st stage heat not needed for heat pump
W2 = Aux. heat indoor heat
G = fan
O = Cooling changeover relay
B = Heating changeover relay
L = System monitor
E = Emergency heat relay

Posted on Sep 17, 2009

  • 1 more comment 
  • Bill Long Sep 22, 2009

    I noticed I didn't explain what you needed to do for Emergency Heat. You need to put a jumper wire from W2 to E on the thermostat for Emergency Heat. B is not used.

  • Bill Long Feb 16, 2010

    R = hot side of transformer

    C = common side of transformer

    Y = compressor contactor

    O = reversing valve it will be energized in the cooling mode

    G = blower / fan

    W2 = indoor unit 2nd. stage

    E = emergency heat (jumper W2 to E)

    W1 = Not used or (jumper Y to W1 but do not hook up wire going to furnace)

    B = Not used

    L = system monitor

  • Bill Long Feb 16, 2010

    R = transformer hot

    C = transformer common

    Y = compressor contactor

    O = reversing valve (energized in cooling mode)

    G = blower / fan

    W2 = Indoor furnace or electric heat

    E = emergency heat ( jumper W2 to E on t'stat)

    L = system monitor

    W1 = not used

    B = not used



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