KitchenAid Refrigerator HRS Error: High Resistance Sensor
What Does KitchenAid Refrigerator Error Code HrS Mean? HrS on a KitchenAid refrigerator stands for High Resistance Sensor. The control board continuously monitors the resistance of each temperature thermistor in the system. When a thermistor returns a resistance value higher than the maximum expected for the ambient temperature, HrS is set. Because a high resistance […]
Quick Assessment
Answer to continue safely
Is it safe to keep using?
Maybe. A refrigerator with HrS is over-cooling rather than under-cooling, so food safety risk is lower than with most fault codes. However, frozen produce or burst beverage containers are practical concerns. Monitor with an independent thermometer.
Can I reset the code?
Yes. If connector reseating resolves the high-resistance reading, a breaker reset clears HrS permanently. A drifted or broken thermistor will cause HrS to return regardless of resets.
When to stop immediately?
Stop if you notice: Fresh food section consistently measures below 32°F by reference thermometer, HrS returns within hours of connector reseating.
Symptoms You May Notice
Refrigerator runs excessively cold — items in fresh food section partially freeze
A thermistor reading too high tells the control board the compartment is warmer than it actually is, causing the compressor and damper to over-cool the section until produce, beverages, and dairy begin to freeze.
Display shows a temperature noticeably different from an independent thermometer reading
Placing a calibrated thermometer in the compartment reveals the actual temperature is several degrees colder than what the display reports, confirming the sensor is biased high.
Defrost cycles initiate more frequently than normal
Because the adaptive defrost algorithm uses thermistor data to estimate frost build-up, a high-reading sensor causes the board to initiate defrost cycles more often than necessary, shortening heater lifespan.
Possible Causes
Partially disconnected thermistor connector
One pin in the thermistor connector has backed out slightly, increasing contact resistance and shifting the apparent sensor resistance upward without causing a complete open circuit.
DIY PossibleThermistor lead wire with high-resistance intermittent break
A hairline conductor break in the thermistor wire creates a series resistance that adds to the sensor resistance, producing a reading that looks like a thermistor that is too cold.
DIY PossibleThermistor probe aged out of calibration
After years of thermal cycling, the NTC thermistor material can shift its resistance curve upward, causing a systematic high-resistance reading at all temperatures.
DIY PossibleSafe Checks You Can Do
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1
Reseat all thermistor connectors
Turn off the refrigerator at the breaker. Locate the thermistor harness connectors — typically accessible behind the fresh food interior light housing or at the control board behind the lower grille. Disconnect each connector, inspect the pins, and firmly reseat it until it clicks.
HrS caused by a partially backed-out connector is one of the few KitchenAid fault codes that can be fully resolved by a homeowner with no parts purchase. Always start here.
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2
Compare display temperature to a reference thermometer
After reseating connectors and restoring power, place an appliance thermometer in each compartment for 30 minutes and compare readings to the display. If the display now matches the reference thermometer within 3°F, the connector was the cause.
Allow the refrigerator 90 minutes to stabilize after a breaker reset before comparing temperatures — initial readings after a reset may not reflect steady-state operation.
When to Call a Professional
Contact a qualified technician if:
- Thermistor resistance at known temperature exceeds specification by more than 10%
- Wire continuity test shows resistance above 1 ohm on either thermistor lead
- HrS persists after thermistor replacement — indicates board ADC or reference voltage fault
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