Whirlpool WRX735SDHZ Refrigerator Problems & Error Codes — Overview
The Whirlpool WRX735SDHZ is a side-by-side refrigerator that shares the common Whirlpool control platform and E/F error-code family. Field failures cluster around sensor circuits, evaporator fan problems, defrost-system faults, and ice-maker issues. The control board uses diagnostic mode entry by pressing SW1 and SW2 simultaneously for 3 seconds until a chime sounds and “01” displays, giving access to cooling tests (steps 1 through 7 and 32 through 39) and other service routines.
Most trouble calls trace to failed thermistors (open or shorted), ice buildup blocking the evaporator fan, defrost-heater time-outs, door-switch or door-seal issues causing false alarms, and occasionally control-board communication faults. Technicians start by power-cycling the unit for one minute to clear transient codes, enter service diagnostics to verify fan and sensor operation, then check resistance at the suspect thermistor and inspect harness connectors for corrosion or broken pins. Forced-defrost tests confirm heater operation when frost is heavy on the rear freezer panel.
Most Common Problems on This Model
- E1 or F1 error code and warm refrigerator compartment Refrigerator temperature sensor (thermistor) has failed open or shorted, or wiring to the sensor is damaged; replace the refrigerator thermistor or repair the harness connector.
- E2 or F2 error code and warm freezer or no airflow Freezer thermistor fault or evaporator fan blocked by ice; check freezer sensor resistance, inspect for frost buildup, and force a defrost cycle or replace the freezer thermistor.
- F3 error codes (F3 E1, F3 E2, F3 E4, F3 E8, F3 E9) and frost on back panel Defrost sensor open, defrost heater failed, or defrost-timer/control-board fault; test the defrost sensor and heater continuity, clear ice manually if needed, and replace the failed component.
- Ice maker shows E3 code or stops making ice Heater time-out on the ice-maker mold (code E3 on ice-maker diagnostics page) or fill-valve issue; check the mold heater for continuity and replace the ice-maker assembly if the heater is open.
- E0 or F0 error and alarm beeping after power outage Power-loss memory or door-open condition flagged by the control; close doors fully, verify door switches click, and power-cycle the refrigerator to clear the transient fault.
- No cooling in both compartments but lights work Compressor not running due to failed start relay, overload, or compressor itself, or condenser fan motor stopped; test relay and overload with an ohmmeter, listen for compressor hum, and replace the failed part.
- Control panel unresponsive or displays garbage characters User-interface board or main control board communication fault, or loose ribbon cable; reseat the UI ribbon cable, power-cycle, and replace the UI or main board if the fault persists.
- Evaporator fan loud or not spinning Evaporator fan motor bearings seized or ice blocking the fan blades; manually spin the fan, force a defrost to melt ice, and replace the evaporator fan motor if it will not turn freely.
Parts That Commonly Fail
| Part | Notes |
|---|---|
| Refrigerator thermistor (temperature sensor) | Amazon | Fails open or shorted; triggers E1/F1 codes and warm compartment. |
| Freezer thermistor | Amazon | Triggers E2/F2 codes; often confused with evaporator-fan issues. |
| Defrost sensor (defrost thermistor) | Amazon | Opens under repeated heat stress; causes F3-family codes and frost buildup. |
| Evaporator fan motor | Amazon | Bearings fail or fan blades crack; blocks airflow and raises compartment temperature. |
Refrigerator Error Codes for This Model
These codes apply to this model line:
- Whirlpool Refrigerator Df error code
- Whirlpool Refrigerator E0 error code
- Whirlpool Refrigerator E1 error code
- Whirlpool Refrigerator E2 error code
- Whirlpool Refrigerator E3 error code
- Whirlpool Refrigerator E4 error code
- Whirlpool Refrigerator E5 error code
- Whirlpool Refrigerator E6 error code
- Whirlpool Refrigerator E9 error code
- Whirlpool Refrigerator Po error code
- Whirlpool Refrigerator Sy Ce error code
- Whirlpool Refrigerator Sy Ef error code
When to Call a Pro
Call a professional for any refrigerant work, compressor replacement, or sealed-system repairs. If you are uncomfortable using a multimeter to test sensors and motors, or if you cannot safely access the evaporator coil behind the rear freezer panel, a technician with the Whirlpool service manual and the correct thermistor part numbers will diagnose faster. Control-board replacement is straightforward for an experienced DIYer, but misdiagnosis wastes money on expensive electronics when the real fault is a ten-dollar sensor or a blocked fan. Always disconnect power at the breaker before removing panels or testing components.