Carrier 38EV024320 User Manual
Page 29
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ERROR CODE #15 - LOW REFRIGERANT CHARGE (see Note 1).
REASON: LARGE REFRIGERANT TEMPERATURE RISE THROUGH INDOOR COIL (COOL MODE),OR OUTDOOR COIL
(HEAT MODE).
POSSIBLE CAUSES: 1) Low refrigerant charge.
2) Plugged or failed solenoid expansion valve (SEV).
Notes:
1) Error code will not affect system operation, and will only be displayed at control board LED.
2) Superheat Tables provided in outdoor unit installation instructions.
3) In outdoor ambients below 75-80°F in Cool, above 45°F in Heat, system will not go to full speed, and SEV should be
cycling on-off.
4) Refer to Figures 15 and 16 to see location of valve orifices. Valve main orifice may be cleaned by blowing air, etc. into
outlet of valve. If this is unsuccessful, replace valve.
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