102777-YIM-E-0206
Unitary Products Group 93
TABLE 46: 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
9 Compressor number one locked out on excessive motor trips
10 Compressor number two locked out on excessive motor trips
11 Compressor number three locked out on excessive motor trips
12 Compressor number four locked out on excessive motor trips
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
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