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IM 934-5
Fault and Protection Codes for Applied PTAC Control Board
Fault code
Description
Cause for the fault
CE
Communication Error
1. Cable not plugged in properly on either LUI or relay board.
2. Defective cable.
Sh
Missing Shunt
The user configurable shunt for System Select, Control Select Off Fan Cycle, and/or Hydronic Valve is
missing or not placed properly.
E1
Problem with IAS
Indoor Air Sensor missing or short.
E2
Problem with ICS
Indoor Coil Sensor missing or short.
E3
Problem with OCS
Outdoor Coil Sensor missing or short.
E4
Problem with OAS
Outdoor Air Sensor missing or short.
E5
Problem with HFLO Sensor 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
Description
Cause for the fault
code
CF
Coil Freeze Protection
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.
Rf
Room Freeze Protection
Indoor air temperature has dropped below 41ºF. Protection feature and the displayed code are
dismissed when indoor room temperature rises at and above 50ºF.
hI
High Room Temperature
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.
Lo
Low Room Temperature
Indoor air temperature is 5 degrees below minimum setpoint limit.
LA
Low Ambient Lockout
Outdoor air temperature is below 25ºF.
Содержание McQuay IM 934-5
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