Carrier Mini-Split: Discharge the inverter capacitors before service
Discharge the inverter capacitors before service on a Carrier mini-split: The big electrolytic capacitors on the outdoor board stay charged after power-off.
Applies to: DLCM(R/H)B multi-zone outdoor units with DLFSHBH high wall indoor units (Midea, Carrier, Viessmann)
How to fix discharge the inverter capacitors before service: step by step
- Turn power off and lock out.
- Put a resistor of about 100 ohm 40 W (or a soldering iron plug) across the + and - capacitor terminals before touching the board.
If the unit shows an error code, look it up: Carrier Mini-Split codes
Models
Carrier DLCM(R/H)B multi-zone outdoor
DLCMHBH24CAKDLCMHBH30DAKDLCMHBH36DAKDLCMHBH48EAKDLCMRBH18BAKDLCMRBH36DAKDLCMRBH48EAK
Carrier DLFSHB high wall indoor
DLFSHBH09XAKDLFSHBH12XAJDLFSHBH12XAKDLFSHBH18XAKDLFSHBH24XAK
Source: Carrier MS-DLFSHB-01 High Wall Ductless Service Manual (04/2021), Troubleshooting Safety p.16. 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.