Danfoss VLT HVAC Drive FC 102
Danfoss VLT HVAC Drive FC 102 code 6: DC link voltage low
The drive intermediate circuit voltage is below the low warning limit, but the unit remains active.
- Code
- 6
- Name
- DC link voltage low
- Controller
- Danfoss VLT HVAC Drive FC 102
- Type
- Low voltage
- What it does
- Warning: the equipment keeps running and flags a problem
- Risk
- GREEN In your wheelhouse
- Source
- The manufacturer's manual (subscribers see which manual and page)
Updated November 4, 2026
How to fix it
Subscribers get:
- What to do next, in plain words
- Which manufacturer manual it comes from, linked
- The step by step check for this problem, one check at a time
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Questions about this code
What does Danfoss VLT HVAC Drive FC 102 code 6 mean?
The drive intermediate circuit voltage is below the low warning limit, but the unit remains active.
Is Danfoss VLT HVAC Drive FC 102 code 6 dangerous?
It is graded green: in a working tech's wheelhouse with standard tools and low risk.
How do I fix Danfoss VLT HVAC Drive FC 102 code 6?
The manual's fix and the step by step check for this code are in WERCS Diagnose, plans from $49 a month. For help right now, WERCS answers 24/7 at (877) 489-3727.
Other Danfoss VLT HVAC Drive FC 102 codes
1 · 10 Volts low2 · Live zero error4 · Mains phase loss5 · DC link voltage high7 · DC overvoltage8 · DC undervoltage9 · Inverter overload10 · Motor overload temperature11 · Motor thermistor over-temp12 · Torque limit
All 73 Danfoss VLT HVAC Drive FC 102 codes · Every fault code