KitchenAid Dishwasher F3 E1 Error: Wash Thermistor Out of Range
What Does KitchenAid Dishwasher Error Code F3 E1 Mean? The F3 E1 error code on a KitchenAid dishwasher indicates the wash water thermistor — the temperature sensor in the sump — is returning a value outside its valid operating range. Rather than indicating that the water is actually too hot or too cold, F3 E1 […]
Quick Assessment
Answer to continue safely
Is it safe to keep using?
No. Without a valid temperature reading, the dishwasher cannot run the heated wash, sanitize, or heated dry functions safely. Dishes will not be cleaned or sanitized to standard. Avoid using the dishwasher until the thermistor is repaired or replaced.
Can I reset the code?
Yes. A breaker reset clears F3 E1. If the fault was caused by a transient glitch, the code does not return. A failed thermistor returns F3 E1 once the board gets its first invalid reading in the next cycle, typically within the first ten minutes.
When to stop immediately?
Stop if you notice: F3 E1 returns within ten minutes of starting any cycle, Resetting the harness connector did not resolve the fault.
Symptoms You May Notice
Cycle halts during the main wash stage before dishes are cleaned
The dishwasher fills and the wash pump starts, but the cycle stops within the first ten minutes when the thermistor value is confirmed out of range.
F3 E1 appears on the display mid-cycle with no prior warning
On KDTM, KDTE, and KDPE display models, F3 E1 appears suddenly during operation and the cycle cannot continue.
Dishes exit the cycle completely wet without any drying
Because the control cannot confirm water temperature, it disables heated dry and sanitize as a safety measure, leaving dishes soaking wet.
Possible Causes
NTC thermistor failure (open or shorted)
The NTC thermistor sensor has failed electrically — either open circuit (too high resistance) or short circuit (too low resistance) — producing a reading the board rejects as out of range.
Requires ProfessionalLoose or corroded thermistor wire connector
The two-wire harness connecting the thermistor to the control board has a loose, corroded, or water-damaged connector that causes intermittent or zero signal.
DIY PossibleControl board thermistor input circuit failure
The control board analog input that converts thermistor resistance to a temperature value has failed, reporting garbage values regardless of actual sensor resistance.
Requires ProfessionalSafe Checks You Can Do
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1
Perform a full breaker reset
Switch off the dishwasher circuit breaker for five minutes, then restore power and run a Normal cycle. A transient voltage glitch can cause the thermistor input to latch out-of-range until the board is fully restarted.
If the cycle completes without F3 E1 after the reset, the fault was a one-time electronics glitch. Monitor the next two or three cycles to confirm the fault does not return.
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2
Inspect the thermistor harness near the sump
Remove the lower rack and filter basket. Look toward the rear of the sump for the thermistor connector — a small two-wire plug near the pump housing. Check whether the connector is seated fully; reseat it by pressing firmly until it clicks.
Water exposure over years of use can cause corrosion on the thermistor connector pins. A visibly green or white-crusted connector should be cleaned with an electrical contact cleaner spray before reseating.
When to Call a Professional
Contact a qualified technician if:
- Thermistor resistance at room temperature is not in the 10–40 kΩ range on a multimeter
- Connector pins are visibly corroded and cleaning did not restore signal
- Board thermistor input reads out of range with a known-good replacement sensor installed
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