Viessmann Error Code F5: Outdoor fan speed out of control (Mini-Split)

Updated October 16, 2026 · by Aurora Star Tech Inc.

Viessmann error code F5 on a mini-split means: Outdoor fan speed out of control. It is also called Viessmann diagnostic code F5.

High severityMini-SplitViessmann Vitocal 200-S DLCM(R/H)B multi-zone outdoor

Homeowner? What Viessmann code F5 means for you

Call a technician Your ductless mini-split is reporting: Outdoor fan speed out of control. The ductless mini-split has locked out or cannot run properly. One reset is fine; if the code comes back, it needs a licensed technician to find the cause.

Safe things you can check yourself

Check the remote: fresh batteries and the right mode (Cool, Heat or Auto).
Check the breaker and the outdoor disconnect; both should be ON.
Open the front cover of the indoor unit and rinse the washable filters if they are dusty; let them dry before putting them back.
Keep the outdoor unit clear of snow, ice and leaves.
Try one reset: turn the power off for 30 seconds, then back on. If the code comes back, stop resetting and call a technician.

Call (647) 657-2977 Book a service call

Licensed technicians serving Vaughan, Toronto and the GTA.

What does Viessmann error code F5 mean?

Same fault as EC07. Shown on the 48K high heat model.

Applies to: DLCMHBH48EAK (48K high heat) only

Safety: Gas, electrical and refrigerant work must be done by a licensed technician. Turn off power and gas before servicing, never bypass a safety control, and always follow the manufacturer's manual for your exact model.

Viessmann models that use code F5

DLCMHBH24CAK DLCMHBH30DAK DLCMHBH36DAK DLCMHBH48EAK DLCMRBH18BAK DLCMRBH36DAK DLCMRBH48EAK

Other Viessmann Mini-Split codes

Code	Meaning
EL01	Indoor / outdoor communication error
F0	Current overload protection
F1	Outdoor ambient sensor (T4) fault
F2	Condenser coil sensor (T3) fault
F3	Discharge sensor (T5) fault
F4	Outdoor EEPROM error
Fb	Vapor injection inlet sensor fault
FC	Forced cooling
Fd	Vapor injection outlet sensor fault
FH 0d	Fault - see outdoor unit
FH 0P	AP mode on / no Wi-Fi kit
FL14	Indoor and outdoor units not compatible

All Viessmann Mini-Split error codes →

Viessmann code F5: homeowner questions

What does Viessmann code F5 mean?

Outdoor fan speed out of control. Same fault as EC07. Shown on the 48K high heat model.

Is it safe to keep using my ductless mini-split with code F5?

It depends on the cause. The ductless mini-split has locked out or cannot run properly. One reset is fine; if the code comes back, it needs a licensed technician to find the cause.

Can I reset Viessmann code F5 myself?

You can try one reset (power off for 30 seconds, then on). If Viessmann code F5 comes back, the cause is still there and a licensed technician should check it.

Who can fix Viessmann code F5 near me?

Aurora Star Tech Inc. repairs Viessmann ductless mini-splits in Vaughan, Toronto and across the GTA. Call (647) 657-2977 or book a service call online.

Homeowner help: AC Running But Not Cooling: What to Check · Heat Pump Not Heating or Blowing Cold Air

Troubleshooting guides

Indoor unit leaking water All brands · Mini-Split
Poor capacity / high head All brands · Mini-Split
Water leaking All brands · Mini-Split
Discharge the inverter capacitors before service Viessmann · Mini-Split
Display shows a strange code or does not answer the remote - DLFSHB indoor Viessmann · Mini-Split
Multi-zone: one room heats, another will not cool - DLC multi-zone Viessmann · Mini-Split
Read live data with the outdoor check button (SW1) Viessmann · Mini-Split
Run the automatic wiring / piping correction Viessmann · Mini-Split

Source: DLCMRBH/DLCMHBH Multi-Zone Outdoor Service Manual (sold as Midea, Carrier and Viessmann Vitocal 200-S; Viessmann doc 6225551-03, 12/2024), Table 24 Outdoor Unit Error Display (48 High Heat only) p.27; diagnosis p.58-59. Written in our own words as a summary; always check the original manual.

General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.