Carrier · Mini-split

PH09 Anti-cold-air in heating

Normal status Carrier DLFSHB high wall indoor

What the display is showing

Indoor fan held off or slow in heating until the coil is warm. Normal.

Applies to: DLFSHBH high wall indoor units 09-24K (Midea / Carrier / Viessmann) on DLC multi-zone or single-zone outdoor units

Models that show this code

5 models in Carrier DLFSHB high wall indoor

DLFSHBH09XAKDLFSHBH12XAJDLFSHBH12XAKDLFSHBH18XAKDLFSHBH24XAK

Other codes on the same units

PC44 Zero speed protection
PC45 Compressor drive chip (IR / 341 PWM) failure
PC46 Compressor speed out of control
PC49 Compressor over-current
PH90 Evaporator coil too hot
PH91 Evaporator coil too cold
-- Indoor units mode conflict
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Source: 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.

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.