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Table 114 — Alert and Alarm Codes (cont)
LEGEND
For 48/50A2,A3,A4,A5 units:
• Compressor internal overload protector is open. Internal
overload protectors are used in the Copeland compressors in
all units except size 60 ton units with voltages of 208/230-v,
380-v, and 575-v.
• Compressor external overload protector (Kriwan module)
has activated. The Copeland compressors in size 60 ton
units with voltages of 208/230-v, 380-v, and 575-v use
external overload protector modules that are mounted in the
compressor wiring junction box. Temperature sensors
embedded in the compressor motor windings are the inputs
to the module. The module is powered with 120 vac from
the units main control box. The module output is a normally
closed contact that is wired in series with the compressor
contactor coil. In a compressor motor overload condition,
the contact opens de-energizing the compressor contactor.
• Circuit breaker trip. The compressors are protected from
short circuit by a breaker in the control box. On the 020-050
size units there is one breaker per two compressors and on
the 060 size units there is one breaker per compressor.
• Wiring Error. A wiring error might not allow the compres-
sor to start.
To check out alerts 051, 052, 055 and 056:
1. Turn on the compressor in question using Service Test
mode. If the compressor does not start, then most likely
the problem is one of the following: HPS open, open
internal protection, circuit breaker trip, incorrect safety
wiring, or incorrect compressor wiring.
2. If the compressor does start verify it is rotating in the
correct direction.
ALARM
OR
ALERT
NUMBER
DESCRIPTION ACTION TAKEN BY CONTROL
RESET
METHOD
PROBABLE CAUSE
T300 Space Temperature Below Limit
Stop cooling, but continue
to heat
Automatic Outdoor dampers stuck, no load
T301 Space Temperature Above Limit
Stop heating, but continue
to cool
Automatic High load, dampers open
T302 Supply Temperature Below Limit Continue to run unit Automatic
Dampers open, check configuration
setpoint
T303 Supply Temperature Above Limit Continue to run unit Automatic
Dampers open, check configuration
setpoint
T304 Return Temperature Below Limit Continue to run unit Automatic
Dampers open, check configuration
setpoint
T305 Return Temperature Above Limit Continue to run unit Automatic
Dampers open, check configuration
setpoint
T308 Return Air Relative Humidity Below Limit Alert Automatic Configuration error, or sensor error
T309 Return Air Relative Humidity Above Limit Continue to run unit Automatic
Dampers open, check configuration
setpoint
T310 Supply Duct Static Pressure Below Limit Continue to run unit Automatic VFD problem, broken fan belt
T311 Supply Duct Static Pressure Above Limit Continue to run unit Automatic VFD problem, broken fan belt
T312 Building Static Pressure Below Limit Continue to run unit Automatic Exhaust issues, check setpoint
T313 Building Static Pressure Above Limit Continue to run unit Automatic Exhaust issues, check setpoint
T314 IAQ Above Limit Continue to run unit Automatic Damper or IAQ control issues
A404 Fire Shut Down Emergency Mode (fire-smoke) Unit Shutdown Automatic
Smoke detector switch or external
switch
A405 Evacuation Emergency Mode Run power exhaust Automatic Special fire mode control
A406 Pressurization Emergency Mode Run supply fan Automatic Special fire mode control
A407 Smoke Purge Emergency Mode Run supply and exhaust fans Automatic Special fire mode control
T408 Dirty Air Filter Continue to run unit Automatic Dirty filter, switch setting
A409 Supply Fan Status Failure Stop unit Automatic Fan drive failure
T409 Supply Fan Status Failure Continue to run unit Automatic Fan drive failure, or sensor failure
T414 Loss of Communication with the Belimo Actuator Close economizer Automatic
Calibrate economizer, economizer
failure, wiring
T414 Belimo Actuator Direction Error Close economizer Automatic Motor direction switch wrong, wiring
T414 Belimo Actuator Failure Attempt to close economizer Automatic Motor failure
T414 Belimo Actuator Jammed Close economizer Automatic Obstruction in damper
T414 Belimo Actuator Range Error Close economizer Automatic Calibrate economizer
T420
R-W1 Jumper Must Be Installed to Run Heat in Service
Te st
No heat Automatic Add red wire jumpers
T421 Thermostat Y2 Input ON without Y1 ON Assume Y2 is Y1 Automatic Thermostat wiring error
T422 Thermostat W2 Input ON without W1 ON Assume W2 is W1 Automatic Thermostat wiring error
T423 Thermostat Y and W Inputs ON Alert Automatic Thermostat issues
T424 Thermostat G Input OFF on a Call for Cooling Turn fan on Automatic Thermostat or wiring issues
T500 Current Sensor Board Failure - A1 Stop compressor A1 Automatic Faulty board or wiring
T501 Current Sensor Board Failure - A2 Stop compressor A2 Automatic Faulty board or wiring
T502 Current Sensor Board Failure - B1 Stop compressor B1 Automatic Faulty board or wiring
T503 Current Sensor Board Failure - B2 Stop compressor B2 Automatic Faulty board or wiring
A700
Supply Air Temperature Sensor Failure Stop staged gas heat Automatic Faulty sensor or wiring error
T701 Staged Gas Thermistor 1 Failure Stop staged gas heat Automatic Faulty sensor or wiring error
T702 Staged Gas Thermistor 2 Failure Stop staged gas heat Automatic Faulty sensor or wiring error
T703 Staged Gas Thermistor 3 Failure Stop staged gas heat Automatic Faulty sensor or wiring error
A704 Staged Gas Leaving Air Temp Sum Total Failure Stop staged gas heat Automatic Faulty sensor or wiring error
T705 Limit Switch Thermistor Failure Stop staged gas heat Automatic Faulty switch or wiring
Axxx — Alarm Pxxx — Pre-Alert
CEM — Controls Expansion module Txxx — Alert
IAQ — Indoor Air Quality TXV — Thermostatic Expansion Valve
OAT — Outdoor Air Temperature VFD — Variable Frequency Drive
IMPORTANT: Prolonged operation in the wrong direction
can damage the compressor. Correct rotation can be veri-
fied by a gage set and looking for a differential pressure
rise on start-up.