Trane TVR Pro CO Series Service Manual page 72

2.9 xF1: DC bus voltage error
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
 1F1 indicates compressor A DC bus voltage error; 2F1 indicates compressor B DC bus voltage error.
 All units stop running.
 Error code is only displayed on the unit with the error.
Trigger / recover condition
 Trigger condition: DC bus voltage < 150V or DC bus voltage >500V continuously for 10 seconds.
 Recover condition: DC bus voltage goes back to normal.
 Reset method: Restart automatically.
Possible causes
 Loosened wiring of the compressor inverter module.
 Incorrect wiring of the reactor and DC bus wire.
 Abnormal power supply.
 Inverter module damaged.
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