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Whirlpool Dishwasher Error Code F3 (Won’t Heat Water)

F3 means the dishwasher isn’t heating water correctly during the cycle, usually the heating element or a safety thermostat.

Risk: Moderate

Meaning

F3 appears when the unit can’t bring water up to the right temperature during the cycle. The heating element or its safety circuit is the main suspect.

The information provided here is a diagnostic aid and does not replace the intervention of a qualified professional.

Possible causes

No cause is certain until it has been checked on the appliance.

Likely Heating element burned out
Possible Safety thermostat tripped
Possible Heavy scale buildup blocking heat transfer

Tools needed

Multimeter
Screwdriver
Descaler

First checks

Test the heating element's continuity with a multimeter.
Check the safety thermostat.
Descale the unit if it hasn't been maintained in a while.

Step-by-step diagnosis

Cut power and empty the tub.
Reach the heating element under the tub, through the front or rear panel depending on the model.
Photograph the wiring before pulling any terminals.
Measure resistance across the element terminals. A few tens of ohms is normal. Infinite means the element is open and finished.
Measure between one terminal and the metal chassis. Any low reading means the element is leaking to earth and must be replaced, whatever else it does.
Check the safety thermostat for continuity when cold. No continuity means it has tripped, and the reason matters more than the thermostat.
If everything measures correctly, descale. A thick scale layer insulates the sensor and skews the temperature reading enough on its own to raise F3.

What not to do

Running repeated hot cycles hoping the fault resolves itself.
Assuming the heating element itself is bad before testing it — a tripped high-limit thermostat is just as common and far cheaper to replace.

When to stop

The element is leaking to earth, or the breaker trips on power-up.
Element and thermostat both measure fine and F3 keeps returning.

An error code varies by brand

The same code can have a different meaning depending on the brand and model. Always check your appliance's manual before acting.

Related guides

When to call a professional

If the simple checks turned up nothing, if the repair involves electricity, gas, or the sealed refrigerant system, or if you have any doubt at all: stop there and hand the appliance over to a qualified technician.