Viessmann Error Code –: Indoor units mode conflict (Mini-Split)
Viessmann error code -- on a mini-split means: Indoor units mode conflict. It is also called Viessmann diagnostic code --.
Homeowner? What Viessmann code -- means for you
Usually minor Your ductless mini-split is reporting: Indoor units mode conflict. This code is usually informational or minor. The safe checks below often clear it; call us if it keeps showing up.
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) 657-2977Book a service call
Licensed technicians serving Vaughan, Toronto and the GTA.
What does Viessmann error code -- mean?
Multi-zone: one indoor unit asks for heating while another asks for cooling or fan. Heating wins; see the mode conflict guide.
Applies to: DLFSHBH high wall indoor units 09-24K (Midea / Carrier / Viessmann) on DLC multi-zone or single-zone outdoor units
Viessmann models that use code --
DLFSHBH09XAKDLFSHBH12XAJDLFSHBH12XAKDLFSHBH18XAKDLFSHBH24XAK
Other Viessmann Mini-Split codes
All Viessmann Mini-Split error codes →
Viessmann code --: homeowner questions
What does Viessmann code -- mean?
Indoor units mode conflict. Multi-zone: one indoor unit asks for heating while another asks for cooling or fan. Heating wins; see the mode conflict guide.
Is it safe to keep using my ductless mini-split with code --?
Usually yes. Code -- is normally minor, but if it keeps coming back have it checked.
Can I reset Viessmann code -- myself?
You can try one reset (power off for 30 seconds, then on). If Viessmann code -- comes back, the cause is still there and a licensed technician should check it.
Who can fix Viessmann code -- 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: Carrier MS-DLFSHB-01 High Wall Ductless Service Manual (04/2021), Table 9 p.17. 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.