Error Code F dH

Defrosting failure — defrost sensor does not reach 40°F (5°C) within 80 minutes after defrosting starts

Also displayed as: F dH

What This Means

Disconnection of thermal fuse (FUSE-M) or defrosting heater; Defect of heater relay on PCB; Drain tube blockage

How to Fix

1. 1

   Step 1: Inspect door gasket for damage or gaps. If gasket is damaged, replace it.

2. 2

   Step 2: Measure defrost heater resistance in Test Mode 1 at CON9 pins 5 to 13. Expected: 42 to 50 Ω. If heater resistance is not in range, check FUSE-M. FUSE-M should read near 0 Ω; if open (infinite), replace FUSE-M.

3. 3

   Step 3: Measure defrost sensor resistance at CON8 pins 26 to 25. Compare to refrigerator/defrost sensor table. If sensor reads exactly 22 kΩ or open, the defrost sensor or defrost controller assembly is faulty — replace product/defrost assembly.

4. 4

   Step 4: Enter Test Mode 3 (push test button 3 times — display shows 33 33). Measure voltage at CON9 pins 5 to 13. Expected: 112V to 116V. If voltage is not present, check relay on Main PCB or replace Main PCB.

5. 5

   Step 5: Enter Test Mode 1 (push test button 1 time). Measure voltage at CON9 pins 5 to 13. If voltage is not 0V in Mode 1, replace Main PCB.

6. 6

   Step 6: If all voltages and resistances are correct, explain normal operation to customer or check for drain tube obstruction.