Specifications

81
Table 41 — Alert and Alarm Codes (cont)
ALARM
OR
ALERT
NUMBER
DESCRIPTION ACTION TAKEN BY CONTROL
RESET
METHOD
PROBABLE CAUSE
A171
Loss of communications with the staged Gas control
board
Stop gas heat Automatic Control Board failure, check lights
T172
Loss of communications with the Control Expansion
Board
Stop options on CEM Automatic Control Board failure, check lights
A173 Loss of communications with the ECB1 Board Stop economizer & power exh Automatic Control Board failure, check lights
A174 Loss of communications with the ECB2 board Stop unit Automatic Control Board failure, check lights
T177 4-20 MA Demand Limit Failure Stop demand limiting Automatic Input failure, wiring error
A200 Linkage Timeout Error - Loss of Communication Stop unit Manual Wiring errors, board failures
T210 Building Pressure Transducer Failure Close economizer, stop exhaust Automatic Sensor failure, wiring error
T211 Static Pressure Transducer Failure Stop unit Automatic Sensor failure, wiring error
T220 Indoor Air Quality Sensor Failure Stop IAQ control Automatic Sensor failure, wiring error
T221 Outdoor Air Quality Sensor Failure Use a default value for IAQ Automatic Sensor failure, wiring error
T229 Economizer Minimum Position Override Sensor Failure
Use software configured mini-
mum
Automatic Input failure, wiring error
T245 Outside Air CFM Sensor Failure not used at this time not used
T246 Supply Air CFM Sensor Failure not used at this time not used
T247 Return Air CFM Sensor Failure not used at this time not used
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 Hunting Alert Close economizer Automatic Motor moving too often
T414 Belimo Actuator Jammed Attempt to close economizer Automatic Damper or motor drive issues
T414 Belimo Actuator Range Error Close economizer Automatic Calibrate economizer
T414 Belimo Actuator Torque Error Close economizer Automatic Damper or drive issues
T420
R-W1 Jumper Must Be Installed to Run Heat in Service
Te s t
No heat Automatic Add red wire jumpers
T421 Thermostat Y2 Input Activated without Y1 Activated Assume Y2 is Y1 Automatic Thermostat wiring error
T422 Thermostat W2 Input Activated without W1 Activated Assume W2 is W1 Automatic Thermostat wiring error
T423 Thermostat Y and W Inputs Activated Simultaneously Alert Automatic Thermostat issues
T424 Thermostat G Input Not Seen 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 Supply Air Temperature Thermistor 1 Failure Stop staged gas heat Automatic Faulty sensor or wiring error
T702 Supply Air Temperature Thermistor 2 Failure Stop staged gas heat Automatic Faulty sensor or wiring error
T703 Supply Air Temperature 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