Danfoss VLT HVAC Drive FC 102
Danfoss VLT HVAC Drive FC 102 code 39: Heatsink sensor
The drive will fault because it is receiving no feedback signal from the heatsink temperature sensor on the power card.
- Code
- 39
- Name
- Heatsink sensor
- Controller
- Danfoss VLT HVAC Drive FC 102
- Type
- Sensor fault
- What it does
- Fault: the equipment trips and stops
- Risk
- YELLOW Booth plays by its own rules
- 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 1 common cause listed for this code
- The step by step check for this problem, one check at a time
- Booking a live video call with Ben, a master booth technician ($250/hr, paid per call)
Questions about this code
What does Danfoss VLT HVAC Drive FC 102 code 39 mean?
The drive will fault because it is receiving no feedback signal from the heatsink temperature sensor on the power card.
Is Danfoss VLT HVAC Drive FC 102 code 39 dangerous?
It is graded yellow: not hard, but a booth does it differently than the gear most techs know, so follow the checks in order.
How do I fix Danfoss VLT HVAC Drive FC 102 code 39?
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
33 · Inrush fault34 · Fieldbus communication fault36 · Mains failure38 · Internal fault40 · Overload of digital output terminal 2741 · Overload of digital output terminal 2942 · Overload of digital output on X30/6 or o45 · Ground fault 246 · Power card supply47 · 24 V supply low
All 73 Danfoss VLT HVAC Drive FC 102 codes · Every fault code