351579-YTS-B-0608
42 Johnson Controls Unitary Products
Table 13: Alarm Default Codes
Code Cause
1 Compressor number one locked out on High Pressure Control
2 Compressor number two locked out on High Pressure Control
3 Compressor number three locked out on High Pressure Control
4 Compressor number four locked out on High Pressure Control
5 Compressor number one locked out on Low Pressure Control
6 Compressor number two locked out on Low Pressure Control
7 Compressor number three locked out on Low Pressure Control
8 Compressor number four locked out on Low Pressure Control
13 First stage heating is locked out due to excessive Limit Switch Trips
14 Second stage heating is locked out due to excessive Limit Switch Trips
15 Third stage heating is locked out due to excessive Limit Switch Trips
16
First stage of heating is locked out because the ignition board failed to turn on the gas valve after 5 minutes of operation or the gas
valve has voltage on it and the control is not calling for this stage of heating
17
Second stage of heating is locked out because the ignition board failed to turn on the gas valve after 5 minutes of operation or the
gas valve has voltage on it and the control is not calling for this stage of heating
18
Third stage of heating is locked out because the ignition board failed to turn on the gas valve after 5 minutes of operation or the gas
valve has voltage on it and the control is not calling for this stage of heating
19 Space Temperature Sensor has failed open or shorted
20 Supply Air Temperature Sensor has failed open or shorted
21 Return Air Temperature Sensor has failed open or shorted
22 Outside Air Temperature Sensor has failed open or shorted
23 Dirty Filter Switch has tripped
24 Unit has locked out on the APS. Air Pressure Switch.
25 The APS is stuck closed.
26 A microelectronics failure has occurred and the control is operating on defaults
27 A microelectronics failure has occurred and the control is down due to a fatal fault.
28 The control is locked out due to Fan Overload Trips
29 Outside Humidity Sensor is out of Range
30 Return Air Humidity Sensor is out of Range
31 IAQ Sensor is out of Range
32 Real Time Clock cannot be read and has a hardware failure
33 Space Temperature Offset is greater than 20K Ohms
34 CV/VAV input is out of range and the unit is locked out
35 Unit is locked out due to low voltage on the 24 VAC supply
36 Smoke Purge
37 Duct Static has Exceeded Limit
38 Supply Air Temperature Cooling
39 Supply Air Temperature Heating
40 Economizer Minimum Position
41 Space Temperature
42 Faulty Duct Static Pressure Sensor / Low Reading
43 Freeze Stat Trip
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