61
N. DIAGNOSTICS
Alarm Codes - Cooling Only
CODE
DESCRIPTION
FAULT LEVEL
0
STANDBY
None
c
COMPRESSOR ON – Low (Flashing if in time delay)
None
C
COMPRESSOR ON – High (Flashing if in time delay)
None
E
Economizer Cooling – No Compressor
None
F
CONTINUOUS FAN
None
4
Comfort Alert Code 4 for Compressor Circuit 1
Shutdown
ALARM Designation:
Locked Rotor Circuit 1
DESCRIPTION:
1. Circuit 1 shutdown and retry after Anti-Short Cycle Delay
(ASCD) Maximum is 3 attempts.
SOLUTION/STATUS/Possible - Troubleshooting Information
1. Low line voltage
2. Excessive Refrigerant in compressor
3. Seized bearings in compressor
5
Comfort Alert Code 5 for Compressor Circuit 1
Shutdown
ALARM Designation:
Open Circuit 1
DESCRIPTION:
1. Circuit 1 shutdown and retry after ASCD.
Note: This alarm is sent by the Comfort Alert Module
only after the fault has been sensed for a minimum of 4
hours.
SOLUTION/STATUS/Possible - Troubleshooting Information
1. Condensing unit power disconnect is open
2. Compressor circuit breaker or fuses are open
3. Compressor contactor has failed open High pressure
switch is open and requires manual reset
4. Broken supply wires or connector is notmaking contact
5. Unusually long compressor protector reset time due to
extreme ambient temperature
6. Compressor windings are damaged
6
Comfort Alert Code 6 for Compressor Circuit 1
Shutdown
ALARM Designation:
Missing Phase Circuit 1
DESCRIPTION:
1. Circuit 1 shutdown
SOLUTION/STATUS/Possible - Troubleshooting Information
1. Compressor fuse is open on one phase
2. Broken wire or connector on one phase
3. Compressor motor winding is damaged
4. Utility supply has dropped one phase
Fault Codes with Descriptions and Solutions:
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