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I have a split air conditioner that I bought in spain. I live in france. I have installed all successfully except the cable with just two wires. The cable connects to the inside via a clip which can only be inserted one way round. on the outside unit there is two places available for the connection . they are marked R1 and R2 and appear to be for ther thermostat. However the two wires are coloured brown and a greenish blue. The problem I have is which one goes to R1 and R2. Any ideas please? Bob

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Makes no difference in an AC circuit

Posted on Sep 11, 2009

Testimonial: "Thanks very much, it was a great help Bob"

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Hello im trying to trouble shoot two split systems the electrical wires were crossed for the two units I fixed it the compressors wont come on, wall unit says e7? This is on the Amcoraire ac split systems.


E7 indicates an "External Feedback Problem" which sounds like a communication problem. I believe there is a sensor cable that runs from the outdoor unit to the indoor unit also. Check that all cables are properly run to the appropriate unit and check all connections for tightness. Here is the link to a manual that includes installation and wiring instructions.
http://www.acwholesalers.com/EasyEditor/assets/amcor%20duo%20uchw-h12%20owners%20manual.pdf

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I have an 18 K unit with E7 error on heat mode


I just installed a YMGI brand mini-split AC and had exactly the same problem. AC worked fine, but when I tried using heat mode I would get an E7 error.

After talking to their tech support I discovered the problem. There was a separate cable that needed to be connected that I'd forgotten to hook up. This cable runs from the internal unit to the outdoor unit and connects a defrost sensor.

In my case I had totally missed that cable when I installed the unit. After running another line and connecting it the unit is now functioning normally.

If this is a new install, then make sure all your cables have been run. If it was previously working, then check to see if one of the cables had become disconnected. If it's not the cable, then it's probably the sensor.

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English Instruction Manual for a Toyo TA-09CHS Split Air Con Unit


I bought two TOYO split air conditioner in 2009. They are awesome, the best quality split air conditioner in Japan. I have two manual in English and I can mail you one. Please let me know how to mail it to you.

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You need four wires(two #10 and two #12) to the outdoor unit, leaving you house, and three wires(#10) coming from the breaker to tye indoor unit inside your house.

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You need five wires(two #10 and three #12) to the outdoor unit, leaving your house, and thee wires(#10) coming from the breaker to your indoor unit inside your house.

This ypical arrangment(all of them use three wires fro the breaker), yet there are other units which may require 6-7 wires connected to the the outdoor unit depends on the added features to the unit.

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It sounds to me that the wire going to y2 on the furnance coming from the thermostat was not wired back up this is the wire that supplies control voltage to the contactor on the condensing unit. I would call the installer who changed the furnace out back to remedy this problem.

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1. mind it - its a very simple installation

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