Carrier 48HC 04-28 Controls, Start-Up, Operation And Troubleshooting page 47

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