Danfoss VLT HVAC Drive FC 102
Danfoss VLT HVAC Drive FC 102 code 40: Overload of digital output terminal 27
The drive faults because the load connected to digital output terminal 27 is overloaded or short-circuited.
- Code
- 40
- Name
- Overload of digital output terminal 27
- 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 40 mean?
The drive faults because the load connected to digital output terminal 27 is overloaded or short-circuited.
Is Danfoss VLT HVAC Drive FC 102 code 40 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 40?
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
34 · Fieldbus communication fault36 · Mains failure38 · Internal fault39 · Heatsink sensor41 · Overload of digital output terminal 2942 · Overload of digital output on X30/6 or o45 · Ground fault 246 · Power card supply47 · 24 V supply low48 · 1.8 V supply low
All 73 Danfoss VLT HVAC Drive FC 102 codes · Every fault code