OM 1077-1 • MAVERICK I 30 www.DaikinApplied.com
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Alarm Designation
Origin
Description
Status/Troubleshooting Information
Main Limit Open
IFC
IFC Energizes inducer and main blower
• Burner Over Fired
• Low Air Flow • Dirty Filter
• Poor Duct Design
• Blocked Duct, Supply and/or Return
• Incorrect Blower Speed Selection
Clogged Filter Warning – CFS
DDC Controller
DDC Controller Displays warning.
• Dirty Filter
AC HI Pressure Switch 1 Trip-HP1
DDC Controller
The DDC Controller recognizes an open high
pressure switch after two seconds from its
occurrence. Since the high pressure switch is wired
in series with the compressor relay, the compressor
shuts down immediately until the pressure switch
is closed again AND the anti-short cycle delay is
expired. Three occurrences of a high pressure
switch within the same call will lock the circuit out.
The lockout is reset by removing the call.
• Outdoor coil is dirty (heating mode)
• Outdoor fan is not running (cooling
mode)
• Dirty indoor coil or filter (heating
mode)
• Indoor blower is not running (heating
mode)
• Liquid line restriction
• Excessive refrigerant charge
AC HI Pressure Switch 2 Trip-HP2
DDC Controller
Manual Reset Limit Switch Open
(Flame Rollout Switch)
IFC
IFC Runs blower for off delay, inducer for post-
purge time and locks out for one hour
• Excessive Burner Pressure
• Improper Venting
• Incorrect Burner Orifices
• Sooted Heat Exchanger
• Bad Inducer Gasket
• Bad Heat Exchanger
Locked Rotor Circuit 2
CA2
Comfort Alert Code 4.
Circuit 2 shutdown.
• Low line voltage
• Excessive Refrigerant in compressor
• Seized bearings in compressor
Open Circuit 2
CA2
Comfort Alert Code 5.
Circuit 2 shutdown and
retry after Anti-Short Cycle Delay (ASCD). Note:
This alarm is sent by the Comfort Alert Module only
after the fault has been sensed for a minimum of
4 hours.
• Condensing unit power disconnect
is open
• Compressor circuit breaker or fuses
are open
• Compressor contactor has failed open
• High pressure switch is open and
requires manual reset
• Broken supply wires or connector is
not making contact
• Unusually long compressor protector
reset time due to extreme ambient
temperature
• Compressor windings are damaged
Missing Phase Circuit 2
CA2
Comfort Alert Code 6.
Circuit 2 shutdown.
• Compressor fuse is open on one
phase
• Broken wire or connector on one
phase
• Compressor motor winding is
damaged
• Utility supply has dropped one phase
Reverse Phase Circuit 2
CA2
Comfort Alert Code 7.
Circuit 2 shutdown.
• Compressor running backward due to
supply phase reversal
Welded Contactor Circuit 2
CA2
Comfort Alert Code 8.
Run outdoor and indoor
fans continuously for circuit 2 and change mode
of operation to Unoccupied Auto. This procedure
prevents the Space Temperature from reaching
extreme values.
• Compressor contactor has failed
closed
• Thermostat demand signal not
connected to module
Low Voltage Circuit 2
CA2
Comfort Alert Code 9.
• Control circuit transformer is
overloaded
• Low line voltage to compressor
Duct High Limit Fault
Future implementation
Invalid Thermostat selection
Indicates that a combination of thermostat inputs
is invalid.
Pressure Switch 1 Closed
IFC
Leave inducer de-energized until pressure switch
open
• Bad Pressure Switch
