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 < 350V or DC bus voltage > 700V 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.
Procedure
F1 error
Compressor inverter module wiring is
loosened
No
The power supply is abnormal
No
Replace the inverter module
Yes
Reconnect cables based on
Yes
Check the power supply
1
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wiring diagram
equipment