Viessmann Error Code P3: Low outdoor temperature cut-off in heating (Mini-Split)
Viessmann error code P3 on a mini-split means: Low outdoor temperature cut-off in heating. It is also called Viessmann diagnostic code P3.
Homeowner? What Viessmann code P3 means for you
Usually minor Your ductless mini-split is reporting: Low outdoor temperature cut-off in heating. 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 P3 mean?
Outdoor air below the heating range; the unit restarts when it warms up. Shown on the 48K high heat model.
Applies to: DLCMHBH48EAK (48K high heat) only
Viessmann models that use code P3
DLCMHBH24CAKDLCMHBH30DAKDLCMHBH36DAKDLCMHBH48EAKDLCMRBH18BAKDLCMRBH36DAKDLCMRBH48EAK
Other Viessmann Mini-Split codes
All Viessmann Mini-Split error codes →
Viessmann code P3: homeowner questions
What does Viessmann code P3 mean?
Low outdoor temperature cut-off in heating. Outdoor air below the heating range; the unit restarts when it warms up. Shown on the 48K high heat model.
Is it safe to keep using my ductless mini-split with code P3?
Usually yes. Code P3 is normally minor, but if it keeps coming back have it checked.
Can I reset Viessmann code P3 myself?
You can try one reset (power off for 30 seconds, then on). If Viessmann code P3 comes back, the cause is still there and a licensed technician should check it.
Who can fix Viessmann code P3 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.27. 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.