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

ALARM
OR
DESCRIPTION
ALERT
NUMBER
Thermostat W2 Input Activated
T412
without W1 Activated
Thermostat Y and W Inputs
T413
Activated Simultaneously
Economizer Damper Actuator Out of
Calibration
Economizer Damper Actuator
Torque Above Load Limit
Economizer Damper Actuator
Hunting Excessively
Economizer Damper Stuck or
Jammed
Economizer Damper Actuator
T414
Mechanical Failure
Economizer Damper Actuator
Direction Switch Wrong
Excess Outdoor Air
Economizer Economizing When It
Should Not
Economizer not Economizing When
it Should
Damper Not Modulating
T415 IAQ Input Out of Range
T416 OAQ Input Out of Range
OAU Motor Failure
OAU Dirty Filter
T418
OAU Low CFM
OAU General Alarm
A420 Supply VFD Fault
LEGEND
ECB — Economizer Control Board
IGC — Integrated Gas Controller
IAQ — Indoor Air Quality
MBB — Main Base Board
OAQ — Outdoor Air Quality
OAT — Outdoor-Air Thermistor
OAU — Outdoor Air Unit
VFD — Variable Frequency Drive
Table 14 — ComfortLink Alarm Codes (cont)
ACTION TAKEN BY
CONTROL
Run unit as if W2 and W1 are
On
Run unit in mode activated
first
Alert Generated
Alert Generated
Alert Generated
Alert Generated
Alert Generated
Alert Generated
Alert Generated
Alert Generated
Alert Generated
Alert Generated
No IAQ Operations
No OAQ Operations
Alert generated
Alert generated
Alert generated
Alert generated
Unit shutdown
48
RESET
PROBABLE CAUSE
METHOD
Automatic Bad Thermostat or Thermostat Wiring
Automatic Bad Thermostat or Thermostat Wiring
Calibrate economizer (E.CAL). If problem still exist then
Automatic
determine what is limiting economizer rotation.
Automatic Actuator load too high. Check damper load.
Automatic Damper position changing too quickly.
No economizer motion. Check damper blades, gears,
Automatic
and actuator.
Automatic Check actuator and replace if necessary.
Automatic Actuator direction control switch (CCW, CW) wrong.
Automatic
Automatic
Automatic
Automatic
Bad sensor, bad wiring, or sensor configured
Automatic
incorrectly.
Automatic Bad sensor, bad wiring, or sensor configured
incorrectly.
Automatic Check OAU motors for failure
Automatic Check/change OAU filters
Automatic Check OAU air flow
Automatic Check OAU
Automatic VFD fault occurred, review VFD faults.