Whirlpool Ice Maker Error Code 4 pulses

The 4-pulse error code on a Whirlpool ice maker indicates that the optics relay is defective. The optics system uses an infrared emitter and receiver to monitor ice levels, and the relay is a critical electrical component in that circuit. When it fails, the control board cannot process optics signals and triggers this fault. Both the emitter and receiver boards need to be replaced to resolve it.

The ice maker is unlikely to produce ice correctly while the 4-pulse fault is active, since the optics relay defect disrupts normal operation. Continuing to run the unit in a fault state is not recommended, as it can place additional stress on other components. It is best to address the repair before resuming regular use.

A reset will not permanently clear the 4-pulse error because the underlying cause is a defective optics relay, which is a hardware failure. The fault code may temporarily disappear after a reset, but it will return once the control board detects the relay defect again. The only lasting fix is replacing the emitter and receiver boards.

The repair requires replacing both the optics emitter and receiver boards, which involves accessing internal components of the ice maker. A technician with appliance repair experience can complete this job, but it is not a simple reset or cleaning task. If you are not comfortable working with appliance electronics, professional service is recommended.

Parts costs for optics emitter and receiver board sets typically range from around $30 to $100 depending on the specific model. If you hire a technician, labor charges can add another $75 to $200 to the total repair cost. Getting a quote before committing to the repair is advisable, especially on older units.