Rheem AC Error Codes and Troubleshooting

Display Codes	Diagnostic Description
0- Standby	No command for unit operation
c - First Stage Cooling	Unit has received a command for first stage cooling
c Flashing	Anti-short cycle timer (3 minutes) or Minimum run timer (30 seconds) active
C - Second Stage Cooling	Unit has received a command for second stage cooling
C Flashing	Anti-short cycle timer (3 minutes) or Minimum run timer (30 seconds) active
h - First Stage Heat Pump	Unit has received a command for first stage heat pump
h Flashing	Anti-short cycle timer (3 minutes) or Minimum run timer (30 seconds) action
H - Second Stage Heat Pum	Unit has received a command for second stage heat pump
H Flashing	Anti-short cycle timer (3 minutes) or Minimum run timer (30 seconds) active
d - Defrost Active	The unit is undergoing a defrost cycle
t - Test Mod	Test Mod
P - Protector Trip	A command for compressor operation is present but no current is measured to the compressor
01 - Long Run Time (Compressor)	The compressor has continuously run for more than 18 hours in the cooling mode.
02 - High Pressure	Compressor limit has opened four (4) times within a call for operation

Rheem AC ICC Diagnostic Codes
Descriptions of the ICC diagnostic codes are provided below: NOTE: Codes must be read from correct side to avoid an error in reading codes.

Rheem AC ICC Diagnostic Codes

Electrical Checks Flowchart


Thermostat Call For Cooling, No Cooling

Rheem AC Electrical Checks Flowchart

Troubleshooting

Rheem AC Troubleshooting

Disconnect all power to unit before servicing. Contactor may break only one side. Failure to shut off power can cause electrical shock resulting in personal injury or death.
SYMPTOM: Unit will not run
POSSIBLE CAUSE:

1. Power off or loose electrical connection
2. Thermostat out of calibration – set too high
3. Defective control board
4. Blown fuses/tripped breaker
5. Transformer defective
6. High-pressure control open/Low-pressure control open
7. Miswiring of communications

REMEDY:

1. Check for correct voltage at line voltage connections in condensing unit.
2. Reset.
3. Check control board diagnostic codes.
4. Replace fuses/reset breaker.
5. Check wiring. Replace transformer.
6. Reset. Also see high head pressure remedy. The highpressure control opens at 610 PSIG.
7. Check communication wiring

SYMPTOM: Outdoor fan runs, compressor doesn’t
POSSIBLE CAUSE:

1. Run or start capacitor defective
2. Contactor defective
3. Loose connection
4. Compressor stuck, grounded or open motor winding, open internal overload.
5. Low-voltage condition

REMEDY:

1. Replace.
2. Replace.
3. Check for correct voltage at compressor. Check and tighten all connections.
4. Wait at least 3 hours for overload to reset. If still open, replace the compressor.
5. Add start kit components.