Trane TVR Pro CO Series Service Manual page 103

2.20 xP3: Compressor current 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
 1P3 indicates current protection on compressor A; 2P3 indicates current protection on compressor B.
 All units stop running.
 Error code is only displayed on the unit with the error.
Trigger / recover condition
 Trigger condition: Current of compressor AA55PHDG-A1Y2 ≥ 41A or DC65PHDG-A1Y2 ≥ 49A.
 Recover condition: Current of compressor AA55PHDG-A1Y2 < 41A or DC65PHDG-A1Y2 < 49A.
 Reset method: Resume automatically.
Possible causes
 Outdoor unit stop valves are closed.
 Indoor load too large.
 Power supply abnormal.
 Sudden interruption of power to IDUs.
 Excess refrigerant.
 System contains air or nitrogen.
Procedure
ODU stop valves are closed
The indoor load is too large
The power supply is abnormal
Sudden interruption of power to IDUs
xP3
No
1
No
No
No
 Poor condenser heat exchange.
 High pressure side blockage.
 Inverter module damaged.
 Compressor damaged.
 Main PCB damaged.
Yes
Open the stop valves
Make sure the combination ratio is less
Yes
Yes
Check the power supply equipment
Yes
Inspect the system and fix the error
Flowchart continued on next page ...
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