Lennox CBX40UHV Series Unit Information page 32

Table 14. Control Single Character Display Alert Codes (Communicating and Non−Communicating)
Alert
Status of Air Handler
Codes
E 105 Equipment is unable to communicate. Indicates numerous message errors. In most cases errors are related to electrical noise.
E 114 No 60 Hertz Power.
E 115 24−Volt Power Low (Range is 18 to 30 volts).
E 120 Usually caused by delay in outdoor unit responding to indoor unit.
E 124 Active Subnet Controller Missing for > 180 seconds. Equipment lost communication with the thermostat.
E 130 Configuration jumper(s) is missing on AHC.
E 131 Non−volatile data corruption.
E 132 Recycle power. If failure re−occurs, replace control. System reset is required to recover.
E 180 Outdoor air temperature sensor (OAS) out of range.
E 201 Indoor blower communication failure including power outage.
Incorrect air handler model size and capacity selected. Check for proper Configuring under Configuring Unit Size Codes in this
E 202
service manual
E 203 No air handler model size and capacity selected. Check for proper configuration.
E 292 Indoor blower motor unable to start (seized bearing, stuck wheel, etc).
E 295 Indoor blower motor over temperature (motor trip on internal protector).
E 310 Discharge air temperature sensor (DATS) out of range. Code is activated during Field Test Mode.
E 312 Restricted airflow Indoor blower motor is running at a reduced CFM (cutback mode **).
E 313 Indoor and outdoor unit capacity mismatch (warning only).
Global network connection error. This usually indicates there is a short or overladed resistance is to low) condition between
E 331
communicating indoor and thermostat units.
E 345 Second−stage cooling link not cut. AHC Y1−Y2 link not cut for non−communicating heat pump
E 346 Heat pump link not cut. AHC R−O link not cut for non− communicating heat pump. Only on AHC Rev 2.4 or earlier.
E 347 Relay Y1 failure. AHC relay activated, but not respond back to AHC.
E 348 Relay Y2 failure. AHC relay activated, but not respond back to AHC.
Heat call with no configured or mis−configured electric heat. Check for proper Configuring under Configuring Electric Heat Sections
E 350
in this service manual.
E 351 Heat section / Stage 1 failed
E 352 Heat section / Stage 2 failed (Same as E 351)
E 353 Heat section / Stage 3 failed (Same as E 351)
E 354 Heat section / Stage 4 failed (Same as E 351)
E 355 Heat section / Stage 5 failed (Same as E 351)
E 401 Compressor ran more than 18 hours in air conditioning mode.
E 402 Compressor system pressure trip.
E 403 Compressor short−cycling − running less than four minutes.
E 404 Compressor rotor locked.
E 405 Compressor open circuit.
E 406 Compressor open start circuit.
E 407 Compressor open run circuit.
E 408 Compressor contactor is welded.
E 409 Secondary low voltage. 24VAC is below 18VAC.
®
E 420 When in icomfort mode with non−communicating HP, defrost cycle running greater than 20 minutes in duration.
** Cutback Mode – The variable speed motor has pre−set speed and torque limiters to protect the motor from damage caused by operating out
of its designed parameters (0 through 0.80 in. w.g. total external static pressure).
pilot relay contacts did not close, or the relay coil in electric heat did not energize.
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CBX40UHV