KitchenAid Range Error Code F21

F21 on a KitchenAid range indicates a Water Level Sensor Error in the steam cooking system. The control has detected that one or more water level sensor probes are not functioning correctly. The display LED indicators are designed to show which specific probe is failing. Steam cooking features will typically be disabled while this fault is active.

Cutting power to the range will clear the error from the display temporarily, but the F21 code will return if the underlying problem has not been fixed. A reset is a useful first step to see if the fault is intermittent, but a persistent F21 requires physical inspection and likely component repair or replacement.

If only the connector at JP21 needs to be reseated, the repair may cost nothing beyond a service call fee, which typically ranges from $75 to $150. If a water level sensor probe requires replacement, parts and labor costs generally fall in the $100 to $250 range. A steam board replacement is the most expensive scenario, with total repair costs potentially ranging from $200 to $450 depending on labor rates and part pricing.

Start by unplugging the range or disconnecting the circuit breaker, then locate the steam board and check the sensor connector at JP21 for a loose or corroded connection. Reseating the connector and restoring power will clear the fault if a poor connection was the cause. If the error returns, the water level sensor probe identified by the display LED may need to be replaced.

Standard oven and cooktop functions may remain operational during an F21 fault, but steam-related cooking features should not be used until the sensor issue is resolved. Operating the steam system with a faulty water level sensor could lead to improper water delivery or damage to the steam board. It is best to address the fault before using any steam cooking functions.