Rheem RRNL Installation Instructions Manual page 10

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3) Flash Code 4 - Locked Rotor
Condition: The compressor internal overload trips where the average run
time is less than 15 seconds.
Possible causes:
Bad run capacitor
Low line voltage
Excessive liquid refrigerant in compressor
Compressor bearings are seized
Faulty hard start components
Active Thermostat Reaction:
The thermostat implements a hard lockout once this error is sensed.
4) Flash Code 6 - Open Start Circuit
Condition: Current is detected in the run circuit but not in the start circuit.
Possible causes:
Bad run capacitor
Open circuit in compressor start wiring or connections.
Compressor start winding is damaged
Active thermostat reaction:
The thermostat implements a hard lockout after 3 hours.
5) Flash Code 7 - Open Run Circuit
Condition: Open circuit in compressor run wiring or connections.
Compressor run winding is damaged.
Active Thermostat Reaction:
The thermostat implements a hard lockout after 3 hours.
Resetting the White-Rodgers Thermostat After a Hard Lockout
The White-Rodgers thermostat will automatically reset after a hard lockout once the
Comfort Alert trouble code has been cleared.