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PC12 DC bus high voltage / 341 MCE error

High severity Carrier DLCM(R/H)B multi-zone outdoorCarrier DLFSHB high wall indoor

What the control is telling you

The main board DC bus voltage went too high (or the 341 MCE drive chip reported an error). Outdoor board shows E5.

Applies to: DLCM(R/H)B multi-zone outdoor units with DLFSHBH high wall indoor units (Midea, Carrier, Viessmann)

Likely causes

  • Supply voltage out of range
  • Bad IPM or outdoor PCB

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

12 models in Carrier DLCM(R/H)B multi-zone outdoor, Carrier DLFSHB high wall indoor

DLCMHBH24CAKDLCMHBH30DAKDLCMHBH36DAKDLCMHBH48EAKDLCMRBH18BAKDLCMRBH36DAKDLCMRBH48EAKDLFSHBH09XAKDLFSHBH12XAJDLFSHBH12XAKDLFSHBH18XAKDLFSHBH24XAK

Other codes on the same units

  • PC06 Discharge temperature protection
  • PC08 Outdoor over-current protection
  • PC10 Low AC supply voltage
  • PC11 AC supply voltage protection (over voltage)
  • PC30 High pressure protection
  • PC31 Low pressure protection
  • PC40 Main chip to compressor drive chip communication error
  • PC41 Current input detection 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 23 Outdoor Unit Error Display p.26; diagnosis p.42, 52-55; Carrier MS-DLFSHB-01 High Wall Ductless Service Manual (04/2021), Table 9 p.17. 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.