Carrier 38EV024320 User Manual
Page 39
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MISCELLANEOUS MALFUNCTIONS
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1) LED stays on after power up.
Reason; Malfunction of communications between thermostat and outdoor unit main control board.
Check For:
A. Improper wiring of thermostat.
B. Loose/corroded connection at:
• thermostat
• indoor unit interface board
• Interface cable at indoor or outdoor unit
C. Defective controi board or thermostat (see Thermostat Section).
2) Compressor does not operate.
• See Error Code #10.
3) Outdoor fan does not operate.
• Fan motor is standard single phase component. Check for failed motor, capacitor, or control board using
Figure 31.
4) Compressor and outdoor fan do not operate.
• Initiate “Run Test” jumper. If either component operates, follow checkout procedure for the failed component
in this section. If neither operates replace control board. If both operate, and control'board LED goes off, unit
is not receiving capacity demand from thermostat. Make sure proper Heat or Cool switch is in “Auto” at
thermostat, and setpoint is at least 2°F away from setpoint. Pull “Speed-Up” jumper to bypass 5 minute
timeguard. If unit does not start within 5 minutes, Follow same procedure for #1 above, “LED stays on after
power up.”
5) Compressor cycles on-off, outdoor fan stays on.
• Compressor is cycling on safety device. See Error code #10 and Figure #25 to investigate excessively high
or low pressures. Check for proper charge, failed fan, blower or failed/plugged solenoid expansion valve.
6) Thermostat display malfunction.
• See thermostat troubleshooting section and instructions included with thermostat.
7) Rev/efsirig válvé does hot operate.
• See Error Code #11.
8) Indoor coil freezing.
• See Error Code # 14.
9) System running abnormally low suction pressures.
• See Error Code #15.
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