Danfoss VLT HVAC Drive FC 102
Danfoss VLT HVAC Drive FC 102 code 29: Heatsink temp
The drive heatsink has exceeded its maximum temperature and will remain locked out until it cools down sufficiently.
- Code
- 29
- Name
- Heatsink temp
- Controller
- Danfoss VLT HVAC Drive FC 102
- Type
- Over temperature
- What it does
- Fault: the equipment trips and stops
- Risk
- YELLOW Booth plays by its own rules
- Reset
- Needs a manual reset
- 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
- What the manual says to do, and the page it is on
- The 6 common causes 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 29 mean?
The drive heatsink has exceeded its maximum temperature and will remain locked out until it cools down sufficiently.
Is Danfoss VLT HVAC Drive FC 102 code 29 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 29?
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
25 · Brake resistor short-circuit26 · Brake resistor power limit27 · Brake chopper fault28 · Brake check failed30 · Motor phase U missing31 · Motor phase V missing32 · Motor phase W missing33 · Inrush fault34 · Fieldbus communication fault36 · Mains failure
All 73 Danfoss VLT HVAC Drive FC 102 codes · Every fault code