Error Code 40E
Cool Select Room defrost heater or safety fuse has failed
Critical
Stop using immediately - risk of damage or safety issue
Also displayed as: 40E
What This Means
Defrost heater open-circuited; Temperature fuse blown; Bimetal thermostat defective; Short circuit in heater
What actually causes this:
Temperature fuse blew from overheating during defrost, or the heater element itself failed.
First Thing to Check
Remove the Cool Select Room evaporator cover and inspect the defrost heater assembly for visible damage or a blown temperature fuse.
Parts Involved
How to Fix
- 1
Disconnect MAIN PCB CN70 wire and measure resistance between CN70 pin 3 and pin 1
- 2
0 Ohm = heater short circuit; check for short
- 3
∞ Ohm = open wire or blown temperature fuse
- 4
Check bimetal thermostat (BT-121-M): Off 140°F/60°C, On 104°F/40°C
Other Error Codes for RF32FMQDBSR
Cool Select Room defrost sensor is failed or loose
Wall voltage too low for freezer compressor to run
Fridge compartment defrost sensor has failed or come loose
Freezer defrost sensor is failed or disconnected
Freezer temperature sensor is open, shorted, or disconnected
Outside air temperature sensor has failed or lost connection
Fridge section ice maker sensor is open, shorted, or out of range
Fridge fan motor stopped or lost feedback signal