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7.6.32 WARNING/ALARM 35, Option Fault
Cause
An option alarm is received. The alarm is option-specific. The most likely cause is a power-up or a communication fault.
7.6.33 WARNING/ALARM 36, Mains Failure
Cause
This warning/alarm is only active if the supply voltage to the drive is lost and parameter 14-10 Mains Failure is not set to [0] No Func-
tion.
Troubleshooting
Check the fuses to the drive and mains supply to the unit.
7.6.34 ALARM 38, Internal Fault
When an internal fault occurs, a code number defined in
Internal Fault Codes is shown.
Troubleshooting
Cycle power.
Check that the option is properly installed.
Check for loose or missing wiring.
It may be necessary to contact the Danfoss supplier or service department. Note the code number for further troubleshooting direc-
tions.
The serial port cannot be initialized. Contact the Danfoss supplier or service department.
The power EEPROM data is defective or too old. Replace the power card.
Internal fault. Contact the Danfoss supplier or service department.
Parameter value outside of minimum/maximum limits.
Internal fault. Contact Danfoss supplier or service department.
The option software in slot A is too old.
The option software in slot B is too old.
The option software in slot A is not supported/allowed.
The option software in slot B is not supported/allowed.
The option software in slot C is not supported/allowed.
Internal fault. Contact the Danfoss supplier or service department.
Replace the control card.
Parameter value is outside its limits.
Option in slot A: Hardware incompatible with the control board hardware.
Option in slot B: Hardware incompatible with the control board hardware.
Internal fault. Contact the Danfoss supplier or service department.
AQ267037536117en-000101 / 130R008374 | Danfoss A/S © 2023.09
Diagnostics and Troubleshooting
VLT HVAC Drive FC 102
Operating Guide
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