Danfoss VLT HVAC Drive FC 102
Danfoss VLT HVAC Drive FC 102 code 42: Overload of digital output on X30/6 or overload of digital output on X30/7
The drive faults because the load connected to digital output X30/6 or X30/7 is overloaded or short-circuited.
- Code
- 42
- Name
- Overload of digital output on X30/6 or overload of digital output on X30/7
- Controller
- Danfoss VLT HVAC Drive FC 102
- Type
- Overcurrent
- 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
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- What to do next, in plain words
- What the manual says to do, and the page it is on
- 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 42 mean?
The drive faults because the load connected to digital output X30/6 or X30/7 is overloaded or short-circuited.
Is Danfoss VLT HVAC Drive FC 102 code 42 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 42?
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
38 · Internal fault39 · Heatsink sensor40 · Overload of digital output terminal 2741 · Overload of digital output terminal 2945 · Ground fault 246 · Power card supply47 · 24 V supply low48 · 1.8 V supply low49 · Speed limit50 · AMA calibration failed
All 73 Danfoss VLT HVAC Drive FC 102 codes · Every fault code