McQuay Model PDAN Fault code

Fault and Protection Codes for Applied PDAN Control Board

Fault code = CE
Description = Communication Error
Cause for the fault = 1. Cable not plugged in properly on either LUI or relay board.
2. Defective cable.

Fault code = Sh
Description = Missing Shunt
Cause for the fault = The user configurable shunt for System Select, Control Select Off Fan Cycle, and/or Hydronic Valve is
missing or not placed properly.

Fault code = E1
Description = Problem with IAS
Cause for the fault = Indoor Air Sensor missing or short

Fault code = E2
Description = Problem with ICS
Cause for the fault = Indoor Coil Sensor missing or short.

Fault code = E3
Description = Problem with OCS
Cause for the fault = Outdoor Coil Sensor missing or short.

Fault code = E4
Description = Problem with OAS
Cause for the fault = Outdoor Air Sensor missing or short.

Fault code = E5
Description = Problem with HFLO Sensor
Cause for the fault = HFLO Sensor missing or short on control board or heating medium >250ºF. Check for installation /
connection of HFLO sensor. Should be on coil return line.

Protection code = CF
Description = Coil Freeze Protection
Cause for the fault = Indoor coil temperature has been below 32ºF for 5 minutes.
Protection feature and the displayed code are dismissed when indoor coil temperature rises above 49ºF.

Protection code = Rf
Description = Room Freeze Protection
Cause for the fault = Indoor air temperature has dropped below 41ºF. Protection feature and the displayed code are
dismissed when indoor room temperature rises at and above 50ºF.

Protection code = hI
Description = High Room Temperature
Cause for the fault = Indoor air temperature is 5 degrees above maximum setpoint limit. Protection feature and the displayed
code are dismissed when indoor coil temperature rises above 50ºF.

Protection code = Lo
Description = Low Room Temperature
Cause for the fault = Indoor air temperature is 5 degrees below minimum setpoint limit.

Protection code = LA
Description = Low Ambient Lockout
Cause for the fault = Outdoor air temperature is below 25ºF.


Solid State Digital Controls – Local User Interface Display Codes

Fault code = LC
Description = Control Lockout –
Cause for the fault = Displays for 5 seconds when any button is pushed when in the "lockout mode".

Fault code = nL
Description = Control Lockout – Normal Control
Cause for the fault = Displays for 5 seconds to confirm normal mode of operation when control lockout turned off.

Fault code = CL
Description = Damper Closed
Cause for the fault = Control setup indicator damper is in "closed" mode.

Fault code = AU
Description = Auto Damper
Cause for the fault = Control setup indicator damper is in "automatic" mode.

Fault code = Au
Description = Auto HP/E
Cause for the fault = Control setup indicator heat pump electric is in automatic changeover mode (HP/E).

Fault code = bY
Description = HP/E Bypass
Cause for the fault = Control setup indicator, electric heat is bypassed when OCS > 40˚.

Fault code = CF
Description = Coil Freeze Protection
Cause for the fault = Indoor coil is ≤ 32˚ for at least 5 minutes. Compressor and outdoor fan stop and indoor fan continues
to run for active defrost.

Fault code = rF
Description = Room Freeze Protection
Cause for the fault = Room temperature < 41˚. Damper closes (Premium board) and unit goes into heat mode.

Fault code = Lo
Description = Coil freeze protection
Cause for the fault = Room temperature is 5˚ below set point.

Fault code = Lo
Description = Coil freeze protection
Cause for the fault = Room temperature is 5˚ below set point.

Fault code = Hi
Description = Temperature Limiting
Cause for the fault = Room temperature is 5˚ above set point.

Fault code = LA
Description = Low Ambient Lockout
Cause for the fault = Unit is in cooling mode and outdoor air < 25˚. Compressor will cut out.

Fault code = E1
Description = Indoor Air Sensor
Cause for the fault = Indoor Air Thermister Failure.

Fault code = E2
Description = Indoor Coil Sensor
Cause for the fault = Indoor Coil Thermister Failure.

Fault code = E3
Description = Outdoor Coil Sensor
Cause for the fault = Outdoor Coil Thermister Failure.

Fault code = E4
Description = Outdoor Air Sensor
Cause for the fault = Outdoor Air Thermister Failure.

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