Trane 4TVH0086FE000AA Service Manual page 123

2.21 PL, C7: Inverter module temperature protection
Digital display output
'x' is a placeholder for the compressor system (compressor and related electrical components), with 1 representing
compressor system A and 2 representing compressor system B.
Description
 1PL indicates inverter module A temperature protection.
 2PL indicates inverter module B temperature protection.
 All units stop running.
 Error code is only displayed on the unit with the error.
Trigger / recover condition
 Trigger condition:
For PL protection: Inverter module heat sink temperature (TF1/2) ≥ 80
For C7 protection: PL protection appears three times in 100 minutes.
 Recover condition: Inverter module heat sink temperature (TF1/2) < 65
 Reset method:
For PL protection: Resume automatically.
For C7 protection: Manually restart.
Possible causes
 Blocked, dirty or loose heat sink.
 Temperature sensor not connected properly or has malfunctioned.
 Main PCB damaged.
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