Service and Parts Manual (2016, 2017, 2018, 2014, 2015, 2013, 2012)

55 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.
2 Input Voltage Out of Specification (187 -
253)
Unit stops, open all relays until voltage is back within specs then resume
operation.
3 Indoor Temperature Sensor is Open or
Shorted
Unit defaults to 75°F in COOLING or 68°F in HEATING and will continue to
operate if setting is below 75°F in cool mode or if above 68°F in heat mode.
4 Indoor Coil Temperature Sensor is Open
or Shorted
The unit’s control board defaults to 40°F. It will override the sensor and the
unit will continue to operate.
5 Outdoor Coil Temperature Sensor is Open
or Shorted
The unit defaults to 20°F, overriding the sensor. The unit will continue to
operate.
Using Elec Heat if available for HEATING. If not available, it will use HEAT
PUMP if the outdoor temperature allows.
6 Outdoor Coil > (grater than) 175 F The unit will shut down for 5 minutes. resume operation for 3 minutes. If test
fails 3 times, the unit operation is locked out. See troubleshooting figure 714.
To reset, turn power off and on.
7 Indoor Coil < (less than) 30 F for 2
consecutive minutes
The compressor will turn off and the High Fan speed will run. When coil
temp reachs
45°F the unit will resume operation after lockout time.
8 Unit Cycles > (greater than) 9 Times per
hour
The unit will continue to operate and be monitored.
9 Unit Cycles < (less than) 3 Times per Hour The unit will continue to operate and be monitored.
11 WallStat Problem or Connection Issue The unit will not operate.
13 VPAK 24K Unit Only
High Pressure Limit Switch is Open
If unit is cooling or heat pump is on, shut down compressor. Run high fan
until switch closes, then resume operation. The third occurance in 1 hour
locks unit out.
Applicable to 24K unit only. To reset, turn power off and on.
15 Heat Pump Error If indoor coil temperature is less than ambient temperature for 3 minutes,
the unit will use electric heat to satisfy the heating demand. Causes could be
bad reversing valve, heat load too high.
16 Temperature beyond operating limits Occurs if the indoor ambient temperature range falls below 0°F or greater
than 130°F. The error code will remain on until the temperature reaches the
operating range and then the unit will return to normal operation.
17 Equipment Doesn’t Meet Minimum
Configuration
The compressor must be enabled and have at least 2 fan speeds.
22 (Not an error code)
Outdoor Coil Temperature < 30 F for 2
consecutive minutes
Unit will use electric heat to satisfy heating demands until the temperature
equals or exceeds 45°F. Applicable for Heat Pump models only.
TROUBLESHOOTING
Error Codes and Alarm Status