BD
Whirlpool Refrigerator
Severity: ModerateWhat Does This Error Mean?
The BD error on a Whirlpool refrigerator indicates a bad defrost cycle — the automatic defrost system did not complete within the expected time frame. This usually means the defrost heater, defrost thermostat, or defrost timer has a problem. Over time, ice will build up on the evaporator coils and the fridge will stop cooling properly.
Affected Models
- WRS325SDHZ
- WRF535SWHZ
- WRS571CIHZ
- WRB322DMBM
- Most Whirlpool side-by-side and French door models
Common Causes
- Defrost heater has burned out and cannot melt frost off the evaporator coils
- Defrost thermostat (limit thermostat) has failed open and is blocking power to the heater
- Defrost timer or control board is not initiating the defrost cycle at the correct intervals
- Heavy frost buildup from a door left open or a failing door seal
- Evaporator fan is not running, causing uneven temperature that stresses the defrost cycle
How to Fix It
-
Remove all frozen food and place it in a cooler with ice.
You will need to fully defrost the freezer to address the BD error.
-
Unplug the refrigerator and leave the freezer door open for 24–48 hours.
Place towels and a pan to catch melting water. A manual defrost clears the immediate ice buildup and allows you to assess the situation.
-
Once fully defrosted, dry the inside of the freezer and check the door seal.
Run your finger around the entire door gasket. A split or warped seal lets warm air in, which refreezes and contributes to BD errors.
-
Plug the refrigerator back in and monitor over the next 3–5 days.
If frost builds up again quickly and the BD error returns, the defrost heater or thermostat has failed.
-
If the error returns within a week, call a technician to test and replace the defrost components.
Both the heater and thermostat are inexpensive parts — replacing both at once during a single service visit is cost-effective.
When to Call a Professional
Accessing the defrost heater and thermostat requires removing the freezer shelves and back panel. These components need to be tested with a multimeter to confirm which one has failed. Expect repair costs of $120–$250 for parts and labor.
Frequently Asked Questions
How often should a Whirlpool refrigerator defrost itself?
Most Whirlpool refrigerators run an automatic defrost cycle every 8–12 hours. Each cycle runs the defrost heater briefly to melt frost off the evaporator coils. If this cycle stops working, frost builds up within a few days and the BD error appears.
Will a BD error make my food go bad?
Not immediately — but if ignored, the growing frost buildup will eventually block airflow through the evaporator coils. Once that happens, the fridge stops cooling and food temperatures will rise. Address the error within a week to avoid food loss.
Can I fix the defrost system myself?
Testing and replacing a defrost heater or thermostat is a DIY repair if you are comfortable using a multimeter and removing freezer panels. The parts are inexpensive and widely available. If you are not comfortable with appliance repair, call a technician.