How can I fix my indoor air handler when the unit is not turning On?Updated a day ago

Introduction

Understand how to troubleshoot your indoor air handler if the unit is not turning On.

Troubleshooting

• Press the manual emergency button on the indoor unit to attempt to turn On the indoor air handler. If the indoor air handler does not turn On after pressing the manual emergency, the remote is not the problem. 
• Verify the wire order is equal between the indoor and outdoor units. The color order must match. 
• Check for splices or damage to the control cable. In order to rule out other variables, we recommend removing accessory items, such as UV lights or condensate pumps, until you resolve the problem. 
• 230V Systems: Check the AC voltage across terminals L1-L2 on the outdoor system using a multimeter. Touch one probe to L1 and the other probe to L2. Verify if the reading is between 208~253 VAC. 230V systems must receive a full 230V reading in order to function. Adding up 115V legs to ground does not work. Note: Do not measure each leg to ground.
  • If the reading is between 208 and 253 VAC, measure whether the reading is the same across 2-3 on both the outdoor and indoor units. Note: All readings must match.
  • If the reading is 0 VAC, the system is not receiving proper power from the power source. Some common reasons include: 
    • A fused disconnect is being used, but the fuses are blown or 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 work.