Solutions for the Indoor Unit Not Turning OnUpdated a day ago

Introduction

This article provides solutions to resolve problems where the indoor unit is not turning on.

Try the Manual (Emergency) button on the indoor unit in order to rule out problems with the remote controller.
Verify that the wire order is equal between the indoor and outdoor units. The color order must match. Check for splices or damage on the control cable. To rule out variables, remove any accessorial items, such as UV lights or condensate pumps, until the problem is solved.
Solution for 230V Systems: Use a multimeter to check the AC voltage across terminals L1-L2 on the outdoor system. Touch one probe to L1, the other probe goes on L2. Do not measure each leg to ground. Verify whether the reading is between 208-253 VAC.
- If the reading is between 208-253 VAC, measure whether the reading is the same across 2-3 on both the outdoor and indoor units. All readings must match. The system must receive a full 230V reading in order to function.
- If the reading is 0 VAC, then the system is not receiving proper power from the power source. Some common reasons are:
  - A fused disconnect is being used, but fuses are blown and not inserted properly.
  - The disconnect box bus-bar is in the Off position.
  - A double-pole breaker is not being used. Single or tandem breakers will not operate.

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