47
T111
Circuit B Loss of Charge
Lockout Circuit B Manual Low refrigerant or faulty suction pressure transducer
Service Test — Circuit B Loss of
Charge
T126
Circuit A High Discharge Pressure
Shutdown Circuit A Automatic
An overcharged system, high outdoor ambient
temperature coupled with dirty outdoor coil, plugged
filter drier, or a faulty high-pressure switch.
Service Test — Circuit A High
Discharge Pressure
T127
Circuit B High Discharge Pressure
Shutdown Circuit B Automatic
An overcharged system, high outdoor ambient
temperature coupled with dirty outdoor coil, plugged
filter drier, or a faulty high-pressure switch.
Service Test — Circuit B High
Discharge Pressure
T133
Circuit A Low Refrigerant Pressure
Add Strike for Circuit A Automatic
Low refrigerant charge, dirty filters, evaporator fan
turning backwards, loose or broken fan belt, plugged
filter drier, faulty transducer, excessively cold return air,
or stuck open economizer when the ambient
temperature is low.
Service Test — Circuit A Low
Refrigerant Pressure
T134
Circuit B Low Refrigerant Pressure
Add Strike for Circuit B Automatic
Low refrigerant charge, dirty filters, evaporator fan
turning backwards, loose or broken fan belt, plugged
filter drier, faulty transducer, excessively cold return air,
or stuck open economizer when the ambient
temperature is low.
Service Test — Circuit B Low
Refrigerant Pressure
T143
Circuit A Failure To Pressurize
Add Strike for Circuit A Automatic Wiring causing reverse rotation or faulty compressor
Service Test — Circuit A Failure to
Pressurize
T144
Circuit B Failure To Pressurize
Add Strike for Circuit B Automatic Wiring causing reverse rotation or faulty compressor
Service Test — Circuit B Failure to
Pressurize
T153 Real Timeclock Hardware Failure
No time and date schedule
operation
Automatic
No time/date configured, software failure, or MBB
failure
A154 Serial EEPROM Hardware Failure Unit Shutdown Automatic Software failure or MBB failure
T155
Serial EEPROM Storage Failure
Error
Unit operation errors Automatic Software failure or MBB failure
A156
Critical Serial EEPROM Storage Fail
Error
Unit Shutdown Automatic Software failure or MBB failure
A157 A/D Hardware Failure Unit Shutdown Automatic Software failure or MBB failure
A163
Circuit A Down Due to Failure
Lockout Circuit A Manual
Circuit has 3 strikes or has been locked out by another
alarm
Service Test — Circuit A Down Due
to Failure
A164
Circuit B Down Due to Failure
Lockout Circuit B Manual
Circuit has 3 strikes or has been locked out by another
alarm
Service Test — Circuit B Down Due
to Failure
T173
Loss of communication with the
Energy Management Module
No action Automatic MBB Software failure, reload software or replace board
T175 Loss of communication with VFD Unit Shutdown Automatic
Communication connection bad or miswired,
misconfigured VFD.
T179
Loss of communication with the
Economizer Control Board
No economizer operation Automatic
Communication wiring problem with ECB or faulty MBB
or ECB
T180
Loss of communication with the
Economizer Actuator
No economizer operation Automatic Communication wiring problem with actuator.
T181
Loss of communication with Outside
Air Unit
Reset OAU data Automatic Wiring Problem or OAU communication failure
A200
Linkage Timeout Error — Comm
Failure
No Linkage Operation fall back
to local SPT
Automatic
Received a table write from Linkage before, now not
receiving any linkage commands
A404 Fire Shutdown Unit Shutdown Automatic Smoke detected by smoke detector
T408 Dirty Air Filter Alert Generated Automatic Dirty Filter
T409
Fan Status Switch ON, fan
commanded off
If IDF.F = Yes, then Unit
Shutdown
If IDF.F =
YES, then
Manual,
otherwise
automatic
Bad Fan Status Switch. Configuration incorrect.
Fan Status Switch OFF, fan
commanded on
If IDF.F = Yes, then Unit
Shutdown
If IDF.F =
YES, then
Manual,
otherwise
automatic
Tripped Circuit Breaker. Broken belt. Bad indoor fan
motor. Configuration incorrect. Bad fan status switch.
T410
R-W1 Jumper Not Installed in Space
Temp Mode
Unable to run heat Automatic Missing jumper wire
R-W1 Jumper Must Be Installed to
Run Heat In Service Test
Unable to Test Heat Outputs
Automatic Missing jumper wire
T411
Thermostat Y2 Input Activated
without Y1 Activated
Run unit as if Y2 and Y1 are
On
Automatic Bad Thermostat or Thermostat Wiring
Table 14 — ComfortLink Alarm Codes (cont)
ALARM
OR
ALERT
NUMBER
DESCRIPTION
ACTION TAKEN BY
CONTROL
RESET
METHOD
PROBABLE CAUSE
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