Rheem RRPL-B Installation Instructions Manual page 9

The Comfort Alert diagnostics module diagnoses system and electrical problems in
the air conditioning system. Abnormal conditions are indicated by flashing
ALERT codes on the yellow LED on the Comfort Alert module. The flash codes are
transmitted to the thermostat when the L terminal on the Comfort Alert Module is
connected to the L terminal on the thermostat. The White-Rodgers 1F95-CA397
thermostat displays a CHECK SYSTEM icon that flashes at the same rate as the yellow
ALERT LED on the Comfort Alert module. Turn this feature ON to achieve
protection, enabling the thermostat to identify certain fault codes when compressor dam-
age is possible and react to those codes by turning the compressor off.
NOTE: The Comfort Alert™ module does not provide safety protection! It does not dis-
connect power from the unit.
Comfort Alert™ Flash Codes
1 – Long Run Time
2 – System Pressure Trip
3 – Short Cycling
4 – Locked Rotor
5 – Open Circuit
6 – Open Start Circuit
7 – Open Run Circuit
8 – Welded Contactor
9 – Low Voltage
See Figures 61 and 62 (Comfort Alert Diagnostic Charts) for more troubleshooting infor-
mation.
Active protection occurs under the following conditions:
1) Flash Code 2 - System Pressure Trip
Condition: Four consecutive compressor protector trips occur where the
average run time until trip is between 1 minute and 15 minutes
Possible causes:
Low suction pressure
• Low pressure switch is open
• Low system charge
Blocked condenser coil
Restricted condenser air flow
Active Thermostat Reaction:
The thermostat will cycle the system ON for 5 minutes and OFF for
five minutes to verify system fault. If this ON/OFF cycling repeats for
30 ten-minute cycles, the thermostat concludes there is a system
problem and implements a hard lockout.
2) Flash Code 3 - Short Cycling
Condition: A pattern of short cycling emerges where the run time for the
previous four cycles is less than three minutes each.
Possible causes:
High head pressure
• High pressure switch is open
• System overcharged
• Non-condensables in system
Faulty thermostat
Intermittent contactor
Active Thermostat Reaction:
The thermostat will cycle the system ON for 5 minutes and OFF for
five minutes to verify the system fault. If this ON/OFF cycling repeats for
30 ten-minute cycles, the thermostat concludes there is a system
problem and implements a hard lockout.
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