| C1 Locked Out Due to High Pressure |
Three HPS1 trips within two hours |
| C2 Locked Out Due to High Pressure |
Three HPS2 trips within two hours |
| C3 Locked Out Due to High Pressure |
Three HPS3 trips within two hours |
| C4 Locked Out Due to High Pressure |
Three HPS4 trips within two hours |
| C1 Locked Out Due to Low Pressure |
Three LPS1 trips within one hour |
| C2 Locked Out Due to Low Pressure |
Three LPS2 trips within one hour |
| C3 Locked Out Due to Low Pressure |
Three LPS3 trips within one hour |
| C4 Locked Out Due to Low Pressure |
Three LPS4 trips within one hour |
| C1 Locked Out Due to Coil Freeze |
Three FS1 trips within two hours. Evap Coil Temp < Evap Coil Temp Cutout
SP |
| C2 Locked Out Due to Coil Freeze |
Three FS2 trips within two hours. Evap Coil Temp < Evap Coil Temp Cutout
SP |
| C3 Locked Out Due to Coil Freeze |
Three FS3 trips within two hours. Evap Coil Temp < Evap Coil Temp Cutout
SP |
| C4 Locked Out Due to Coil Freeze |
Three FS4 trips within two hours. Evap Coil Temp < Evap Coil Temp Cutout
SP |
| Exhaust Fan VFD Failure |
EX VFD BI trips. Must be set up as Exhaust or Variable Frequency Fan |
| HS1 Locked Out Due to Limit Switch |
Three LS1 trips within one hour |
| HS2 Locked Out Due to Limit Switch |
Three LS2 trips within one hour |
| HS3 Locked Out Due to Limit Switch |
Three LS3 trips within one hour |
| Unit Shutdown Due to Smoke, etc |
SD input loses 24 VAC |
| Supply Fan VFD Failure |
Fan VFD Input trips. Must be set up as NOT Single Speed |
| No Heat-Cool Due to Unreliable Space-T |
Input Unreliable |
| 4-Stage Communication Failure |
4-Stage board goes from Online to Offline |
| Economizer Communication Failure |
Economizer board goes from Online to Offline |
| Outputs Disabled Due to Low Input V |
Blackout Conditions |
| Outputs Limited Due Brownout Input V |
Brownout Conditions |
| Unit Locked Out Due to APS |
Three APS trips within 1.5 hours. If APS is installed or based on Duct Pressure if
Variable Speed Fan enabled |
| Unit Locked Out Due to Supply Fan OL |
Three FAN OVR trips within two hours |
| Unit Locked Out Due to High Duct-P |
Duct Static Pressure is greater than the High Duct Static
Pressure Setpoint |
|
Freeze Protect Disabled - Bad Sensor
|
One of the Evaporator Coil Temperature sensors is unreliable
|
|
C1 Locked Out - Exceeded Op Env Limits
|
Three envelope trips within two hours
|
|
C1 Locked Out Due to Oil Switch
|
Oil Level Sensor does not detect oil
|
|
C1 Locked Out Due to VFD Failure
|
VSCOMP-A input on the FDD controller reads 0V
|
|
C1 Locked Out - High Discharge Pressure
|
Three high Discharge Line Pressure 1 trips within two hours
|
|
C1 Locked Out - Low Suction Pressure
|
Three low Suction Line Pressure 1 trips within two hours
|
|
C2 Locked Out - High Discharge Pressure
|
Three high Discharge Line Pressure 2 trips within two hours
|
|
C2 Locked Out - Low Suction Pressure
|
Three low Suction Line Pressure 2 trips within two hours
|
|
C3 Locked Out - High Discharge Pressure
|
Three high Discharge Line Pressure 2 trips within two hours
|
|
C3 Locked Out - Low Suction Pressure
|
Three low Suction Line Pressure 2 trips within two hours
|
|
C4 Locked Out - High Discharge Pressure
|
Three high Discharge Line Pressure 1 trips within two hours |
|
C4 Locked Out - Low Suction Pressure
|
Three low Suction Line Pressure 1 trips within two hours |
|
Defrost Disabled - Bad Sensor
|
At least one heat pump is installed, and one, or both of the condenser coil
temperatures is unreliable
|
|
C1 Locked Out - High Discharge Line Temp
|
Discharge Line Temperature 1 exceeded 245°F
|
|
A2L Leak Detector Alarm
|
R454B input reads 0V
|
|
A2L Leak Detector Alarm-Lockout
|
Three R454B trips within two hours
|
|
Cooling Locked Out - Condensate Overflow
|
COND-A input reads 0V
|