53 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 603 (Diagnostic Codes)
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