ALARM 69
Power card temperature
Danfoss · VLT HVAC Basic FC 101
What does ALARM 69 mean?
The temperature on the frequency converter's power card is outside its acceptable operating range (either too high or too low). Extreme temperatures can lead to premature component failure or immediate drive shutdown to prevent damage.
Additional Steps
Steps 1–2 are listed in Priority Fix.
- 3
Verify the proper operation of the cooling fan(s) on the drive, ensuring they are not obstructed or faulty.
- 4
Inspect the power card for any visible signs of overheating, such as discoloration or burnt components.
Source: Danfoss VLT HVAC Basic FC 101
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