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Changing thermostat andcontrol box

Old control box model 3308448.004 new 3109226.005 keystone said this swap would work with existing wire when hooked up have a EE show up on thermostat also 2 wires on new control box for load shed old box did not have

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Posted on Jan 02, 2017

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  • 1 Answer

SOURCE: thermostat wiring for second ac unit

I replaced one unite with another and the wires are differance colors the old unites wires are red,purple,yellow,bleck and white the new one have orange,brown,cream,darkpurple,and white

Posted on Aug 02, 2008

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motor1258
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SOURCE: duo therm air conditionning/furnace thermostat in RV

Checked all breakers & fuses in panel ?

Posted on Aug 14, 2008

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SOURCE: comfort control center not working properly

You need to check the cable that connects the Comfort Control to the upper unit. This cable has four wires and should have continuity through all wires. If there is a break in one of the wires or a short, it will cause the CCC to fail and report an error. If all this is fine, then you have a bad control unit in the main unit. Try unplugging the rear unit from the control board and then resetting the Tstat, if this works, then there is a communication problem between the front AC control board and the rear AC control board or the rear control board is bad. Check the cable between the front and rear AC for OK. If it is alright, then you have a bad control unit in the front unit.

Another quick check is to remove the inner shroud from the front unit pull down the control box. Remove the access cover and view the dip switch panel located inside. It should be labeled Zone 1 Zone 2 etc...try turning off Zone 2 and furnace and resetting the tstat. If this works then turn zone 2 on and reset the tstat. If this is ok, then turn the furnace on and reset again. If this works, then all should be ok. If one of these fails, then you can pinpoint the problem there and move forward.

Hope this helps,

Jeff

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Posted on Jul 05, 2009

motor1258
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SOURCE: I have a DuoTherm BriskAIr 13.5K BTU. The Dometic

If you look at control box at roof unit, they usually use a separate set of wires for furnace. See what colors they are attached to at harness to thermostat. Some just follow other harness, and come out at thermostat. (bypass control box) Once you've determined which 2 they are, join them together & see if furnace starts, as it should. If it does, thermostat is faulty. If not, pull outside cover off & check voltages at furnace. I'm guessing by furnace model that your unit is approx 30 ft , but if it's a park model, you may have 24 volt system on furnace or 12 volt. Another way of confirming is to go to back of furnace where air intake grille is inside your unit, and locate 2 blue wires going to furnace & remove whatever wires are attached to them & connect them together. Furnace should start up.

Posted on Jul 08, 2009

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motor1258
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SOURCE: problem w/ dometic penguin a/c. upgrade kit?

You know what, I have never ran into that yet in 15 years, so I think your best bet would be to go to, (dometicusa.com) and send then a quick inquiry to confirm, what would be required, they are usually pretty helpful believe it or not.

Posted on Aug 07, 2009

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Your post didn't mention the Tstat model, if it is new or existing, what if anything might have changed near the tstat (new appliance, ceiling fan in the area) and so on. If it's new and wired correctly and the old one worked fine in the exact same mounting location, then it could be as simple as a defective tstat. If it's existing it could still be defective. On simple systems the tstat control lead for cooling turns on the condensing unit outside and the air handler inside, while the heat control lead on a non-heat pump unit turns on the air handler and heat strip. Newer systems split up the inside and outside units and control them separately to be more efficient. I don't know if you're having an issue with the heat or cool mode. If it's not the tstat then you will likely need to have a trained professional evaluate your system for system issues. Home depot carries Honeywell which Trane uses in their residential systems. Smart tstats are appearing now and while they have their advantages, putting one in an old system would be like putting a new Porsche engine in an old car with the original legacy transmission, so to speak.

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