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Midea · Mini-split

P1 Over or under voltage protection

High severity Midea DLCM(R/H)B multi-zone outdoor

What the control is telling you

Same fault as PC10 / PC11. Shown on the 48K high heat model.

Applies to: DLCMHBH48EAK (48K high heat) only

Test and repair steps

  1. Safety kill power at the disconnect and wait for the inverter capacitors to discharge before touching boards or wiring.
  2. Measure supply voltage L1-L2 at the outdoor unit: about 187-253 VAC is acceptable.
  3. Measure DC across P and N on the IPM board: 277-356 V for 18-27K, 277-410 V for 36-48K.
  4. On 2-3 zone units also check DC across the bridge rectifier + and -: 190-250 V is normal.
  5. If the supply is good, replace parts in this order and retest: bridge rectifier (4-5 zone units), IPM board, outdoor main board.

Models that show this code

7 models in Midea DLCM(R/H)B multi-zone outdoor

DLCMHBH24CAKDLCMHBH30DAKDLCMHBH36DAKDLCMHBH48EAKDLCMRBH18BAKDLCMRBH36DAKDLCMRBH48EAK

Other codes on the same units

  • LC06 IPM high temperature / PFC frequency limit
  • P0 Inverter module (IPM) fault
  • P2 Compressor top overheat (OLP)
  • P3 Low outdoor temperature cut-off in heating
  • P4 Compressor drive fault
  • P7 IPM temperature sensor fault
  • PC00 Inverter module (IPM) protection
  • PC0A Condenser high temperature protection

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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.52-55. Summarized in our own words; check the original manual for your model.

Homeowner looking at this code? See what it means for you and when to call a technician.

For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.