44 PB
DIAG
CODE
PROBLEM CONTROL BOARD'S ACTION
1 Front Panel Button Stuck For More
Than 20 Seconds
Continue to monitor for "OPEN" (Unstuck) switch. Do not process
switch input. ENSURE FRONT COVER DOES NOT DEPRESS
BUTTONS
3 Indoor Temperature Sensor is Open
or Shorted
Set temp to 75°F in COOLING or 68°F in HEATING. Unit continues
to operate
4 Indoor Coil Temperature Sensor is
Open or Shorted
Control Board sets temp to a default of 40°F. Override sensor.
Unit continues to operate.
5 Outdoor Coil Temperature Sensor is
Open or Shorted
Sets temp to 20°F. Override sensor. Continue operation. Use
Elec Heat if available for HEATING. If not available use HEAT
PUMP if outdoor temp allows.
6 Outdoor Coil greater than 175° F Turn Compressor off. Wait for the outdoor coil to be less than
150°F for more than 2 consecutive minutes.
7 Indoor Coil less than 30° F for 2
consecutive minutes
Turn compressor and electric heat off. When coil temp reaches
45°F resume operation after lockout time.
8 Unit Cycles greater than 9 Times
per hour
Continue operation. Continue to monitor. Take no action. Log
Only.
9 Unit Cycles less than 3 Times per
Hour
Continue operation. Continue to monitor. Take no action. Log
Only.
12 Discharge Air greater than 185°F Shutdown electric heater. Wait for the discharge air temperature
to be less than 100°F. Resume operation.
13 High Pressure Switch Open Turn compressor off. Wait until pressure switch is no longer
open. Resume operation after lockout time.
14 Discharge Air Temperature Sensor
is Open or Shorted
Override Sensor. Set temp to 75°F. Continue to monitor. Set
error code 14 ON.
16 Temperature Beyond Operating
Limits
Ambient temp is less than 0°F or greater than 130°F. Turn
off compressor, electric heat, and fan. When cleared resume
operation.
22 Outdoor Coil Temperature less than
30°F for 2 consecutive Minutes
Only applicable to units with heat pump and electric heat. Turn
off heat pump operation. Use electric heat to satisfy all heating
demands. Cleared when outdoor coil temp is greater than 45°F.
23 Frost Protection. Only applicable to heat pump only units. Active when Heat Pump
run time exceeds 60 minutes with the outdoor coil temp less
than 26°F. Runs active defrost for up to 6 minutes.
TROUBLESHOOTING
Diagnostic Codes
Figure 716 (Diagnostic Codes)
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