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Robert Shaw 9600 - no heat blowing question

I have the same issue - and I posted this on the original thread someone else posted.

*** I had issues determining what color the "common" wire was. I have ared, white, yellow and green. Between the white and red i get .10-.70volts - between the yellow or green and red I get 28 volts.

Sodoes this mean I need better batteries - the instructions say"energizer" - but if this is the case - does it mean it is not myfurnace?

I can hear the unit buzzing atop the roof. But insideto air blows unless I turn the "fan" position to "on". - Then of courseno heat comes out.

Would be grateful for any reply!

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  • Thomas Woodburn
    Thomas Woodburn Apr 05, 2017

    Turn the power off and remove stat. Wire red and white together and turn power on. This should bring the heat on. If it does then the problem is the tstat. If not its either the wire or the unit

  • jack morton Apr 05, 2017

    You mentioned " on the roof". Is this a travel trailer? I changed a control board on a traveler where I had to change the tstat with it. The tstat had no common and needed no batteries. Just an FYI. As far as what color the common is, we can use any color for any terminal. It just depends on how the unit is wired versus the tstat. As Thomas said, jump R to W and you should have heat. This is only true if W is your heat circuit. If it is wired to NORMAL wiring practices, R is power, W is heat, Y is cool, G is fan, and Blue is common if available. Again, we can use any color we want. If you have 28v to Y and G, that's odd to me because that tells me that your cool and fan circuit are powered up with the tstat off the wall. So be careful jumping anything! I think you need a tech to help figure it out or you may jump a wire and end up opening the transformer costing more money on labor and parts. Hope this helps!



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  • Heating & Co... Master
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Typically red is power green is indoor fan white is for heat and yellow is for cooling. Sounds like you don't have a common. This IS ok just means your tstat requires batteries. BUT, if your tstat turns the fan on then it's not the batteries. Is this a newly installed tstat? Sounds like you might be on "gas" setting rather than "electric" need to check the settings or sometimes on the back of the tstat there's a little switch to flip to electric. Many tstats come from the manufacture set for gas rather than electric. Good Luck!!

If you need further help, reach me via phone at

Posted on Apr 05, 2017


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Thanks for the response, to be more specific, the nine pin connector was damaged, but I was able to connect the wires back to main unit panel. I am ready to hook to the hunter thermostat and do not know which wires to connect to. This is my problem and I do not want to short something out. Hope this helps, I want to get it installed again. Thanks again for caring....Jerry

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SOURCE: I need help with my central heat and air unit, it

Normal 0 MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman";} Thermostat wire color codes explained.
Please note. Not all installers use the proper color codes when they install or replace equipment. It may be necessary go go to the furnace or outdoor unit to verify what wires are for what purpose. Also be sure there are no splices in the wire that could change the wire colors between components.

  • R (red) or Rh (Red heat) 24 volts from equipment.
  • Rc (Red cooling) 24 volts from transformer in cooling equipment.
Note: If only furnace has a transformer and cooling equipment does not jumper Rc and Rh.
  • W (White) sends 24 volts to furnace control to start the heating cycle.
  • W2 (no standardized wire color, usually whatever wire color is available) controls second stage heat.
Note: W2 is most often used for heat pumps to control what is called emegency heat or Auxillary heat, and most often will use the white wire.
  • Y (yellow) often (blue) is used, controls cooling unit (outdoor condensing unit) also is used for heat pump heat.
  • Y2 (no standardized wire color, usually whatever wire color is available) controls second stage cooling.
  • G (Green) controls the fan "on" operation of the furnace/air handler. Also often is used to start the blower for many electric furnaces.
  • C (common) most often brown but can also be black or other color available to installer.
  • O (orange) Energizes heat pump reversing valve for cooling (Trane and most other brands).
  • B (Blue) Energizes heat pump reversing valve for heating (Rheem, Ruud and Weatherking).

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. your blue is probably common and if you hooked it to Y you shorted the transformer or blew the low voltage fuse. Green is fan, yellow is AC, Red is 24volt. Is it a heatpump or just ac? I think its probably a heat pump and your brown is your Reversing valve it needs to be hooked to O on the new stat. If its a heatpump your tstat must be a 2heat 1 cool stat w/ aux heat. Without knowing what terminals the wire were hooked to on the old stat you may have to look at whats hooked up at airhandler( furnace) and on A/C (heatpump) tobe able to determine what goes where on the new one.

Posted on Sep 20, 2009

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Yes you did correct. Tape of f blue wire. On your thermostat you should have el/gas turn top el and fan should work Russ

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SOURCE: RV Dometic Duo Therm roof top AC w/heat pump Model

If the Air comeing out is the same as the temp inside the RV make sure the compressor is running and not just the fans. It could be low on freon. If freon is ok then you would need to ck the wiring to the selector switch for a short. It would be obviouse because there will be melted wires. I am leaning toword low on freon since you have already been inside the wiring/control unit.

Posted on Aug 08, 2010

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