Whirlpool 4.3 CU FT Service Manual page 21

FAULT/ERROR CODES – HEAT PUMP DRYER (Continued)
Icon Display
For Service Technician Use Only
Text Display Explanation and Recommended Procedure
Heat Exchanger (HX) NTC (Thermistor) Value Too High or Too Low
F06
• Perform reset procedure (turn on the dryer, then press and hold POWER
until "3-2-1" and then "rES" appears in the display). Try to run a cycle; if the
issue persists, turn off and unplug the dryer, check ACU connections and
harness, and perform Test #4C, Compressor Thermistor section, page 18.
Note: Make sure there is no laundry inside the dryer, and that the ambient
temperature of the laundry area is between 41°F (5°C) and 95°F (35°C).
Motor Movement Defect/Broken Drum Belt
F07
• Perform reset procedure (turn on the dryer, then press and hold POWER
until "3-2-1" and then "rES" appears in the display). Try to run a cycle; if the
issue persists, turn off and unplug the dryer, check ACU connections and
harness, and perform Test #3, page 14. Note: Make sure there is no laundry
inside the dryer.
MCU Communication Error (No Communication Between ACU and MCU)
F10
• MCU issue. Follow same procedure as for F07.
MCU Motor Failure
F11
• Follow same procedure as for F07.
MCU Not Reset
F12
• Follow same procedure as for F07.
Undervoltage Condition
F14
• Perform reset procedure (turn on the dryer, then press and hold POWER
until "3-2-1" and then "rES" appears in the display). Try to run a cycle; if the
issue persists, turn off and unplug the dryer, check ACU connections and
harness, and perform Tests #1, #2, & #3, pages 12–14. Note: Make sure there
is no laundry inside the dryer.
MCU Failure (Rectifier Diode Shorted/Open)
F15
• Follow same procedure as for F07.
MCU Over Temperature
F18
• Follow same procedure as for F07, except wait several minutes for the dryer
to cool after it is turned off and unplugged.
MCU Over Voltage
F19
• Follow same procedure as for F14.
Motor Over Current
F20
• Follow same procedure as for F14.
UI Communication Error (No Communication Between ACU and UI)
F21
• UI issue. Perform Test #12, page 22.
ACU Communication Error (No Communication Between ACU and UI)
F22
• ACU issue. Perform Test #12, page 22.
Compressor Defect
F23
• Perform reset procedure (turn on the dryer, then press and hold POWER
until "3-2-1" and then "rES" appears in the display). Try to run a cycle; if the
issue persists, turn off and unplug the dryer, check ACU connections and
harness, and perform Test #4b, page 15.
Fan Defect
F24
• Perform reset procedure (turn on the dryer, then press and hold POWER
until "3-2-1" and then "rES" appears in the display). Try to run a cycle; if the
issue persists, turn off and unplug the dryer, check ACU connections and
harness, and perform Test #10, page 21.
DIAGNOSTICS & TROUBLESHOOTING
Whirlpool Compact Heat Pump Dryer
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