Carrier Air Conditioner: Compressor will not run – winding and electrical checks – Carrier split systems

Compressor will not run - winding and electrical checks - Carrier split systems on a Carrier air conditioner: Compressor does not start, hums, or trips on internal protection.

Homeowner with a air conditioner problem? Call (647) 657-2977 or book a service call — licensed technicians across Vaughan and the GTA.

Applies to: Carrier/Bryant split AC and HP

Common causes of compressor will not run - winding and electrical checks - carrier split systems

• Internal overload open (hot compressor)
• Open, shorted or grounded winding
• Bad run/start capacitor or PTC
• Low voltage
• Locked rotor

How to fix compressor will not run - winding and electrical checks - carrier split systems: step by step

1. Let a hot compressor cool so the internal line break can reset.
2. Power off, discharge capacitors, remove C, S, R leads.
3. Find terminals: largest reading is S-R, the remaining terminal is C; C-S is the higher of the other two.
4. An open reading on any pair means an open winding - replace.
5. Check to ground with a megger or high ohms scale; low reading means grounded - replace.
6. Check capacitors; replace any bulged or leaking one. PTC start thermistor 12.5-ohm type should read 12.5-22.5 ohms.
7. If the compressor draws locked-rotor amps with all external causes cleared, replace it and check the system for the root cause.

If the unit shows an error code, look it up: Carrier Air Conditioner codes

Models

Carrier 2-stage 24ANB/25HNB

24ANB12424ANB13624ANB14824ANB16024ANB72424ANB73624ANB74824ANB760

Carrier Infinity 19VS 24VNA9

24VNA924VNA91324VNA92424VNA92524VNA93624VNA93724VNA94824VNA94924VNA960