Installation & Operation Manual (2019)

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Unit Control Panel
The display has four (4) digits. The left two digits indicate the error code (1-24) and the “On/Off” icons above these digits
indicate the current state of the error code. The right two digits show the history count (up to 99) of the associated error.
The display contains a maintenance icon (wrench) that will illuminate when the unit requires maintenance.
Diagnostic Error Codes
Code Description Action
1 Front panel button stuck for more than 20 seconds Continue to monitor for “open” switch.
2 Input voltage out of specication Unit stops and opens all relays until voltage is back within specication.
3 Indoor temperature sensor open or shorted The unit defaults the sensor to 75F in COOLING and 68F in HEATING and continues
operation.
4 Indoor coil temperature sensor is open or shorted The unit defaults the sensor to 40F and continues operation.
5 Outdoor coil temperature sensor is open or shorted The unit defaults the sensor to 20F and continues operation. The unit will default to
electric heat in HEATING if available.
6 Outdoor coil > (greater than) 175F The unit will shut down for 5 minutes then resume operation. If the failure occurs
three times the severity is increased and unit operation is locked out.
7 Indoor coil < (less than) 30F for 2 consecutive
minutes
The compressor will turn off and the high fan speed will run. When the coil tempera-
ture rises above 45F the unit will resume normal operation.
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.
10 Room freeze protection Only applicable when electric heat is available. Will run high speed fan and electric
heat until the room temperature reaches 46F. The unit will display “FRZ” during
operation. Logged only.
11 Thermostat or connection issue The unit will not operate
12 Not Applicable Not Applicable
13 High pressure limit switch is open
***Applies to 24000 BTU/hr units only
Compressor is turned off and high speed fan is run until the switch closes. 3 occur-
rences within an hour will lock out unit operation.
14 Not Applicable Not Applicable
15 Heat pump error If the indoor coil temperature is less than the ambient temperature for 3 minutes the
unit will use electric heat to satisfy heating demand.
16 Temperature beyond operating limits Occurs if the ambient temperature falls below 0F or above 130F. The unit is turned off
until the temperature returns within operating range then continues normal opera-
tion.
17 Minimum conguration not met The compressor must be enabled and have at least 2 fan speeds
18 Not Applicable Not Applicable
19 Not Applicable Not Applicable
20 Not Applicable Not Applicable
21 Not Applicable Not Applicable
22 Outdoor coil temperature < 30F for 2 consecutive
minutes
Unit will use electric heat to satisfy heating demands until the coil temperature rises
above 45F. Applicable for heat pump models only.
23 Frost protection Unit will run active defrost for a minimum of 6 minutes when the heat pump run-time
is greater than 60 minutes and the outdoor coil temperature is 26F or less.
24 Not Applicable Not Applicable