What does Samsung Microwave C-22 Error Code - Causes & Fix mean?

C-22 means a temperature sensor fault (open or short circuit). Most often fixed by replacing the thermistor or checking its wiring.

How do I fix Samsung Microwave C-22 Error Code - Causes & Fix?

Follow the step-by-step diagnosis below. The most likely fix is identified by checking power, sensor resistance, and control-board signals in order — using a multimeter and the part numbers documented in the parts reference table.

Can I keep running the equipment with 22 active?

Generally no. Faults on Appliance units are emitted when a sensor, safety, or control circuit is outside its operating envelope. Running through an active fault risks compressor, heater, or control-board damage. Diagnose and clear the fault first.

What part is most commonly replaced for Samsung Microwave C-22 Error Code - Causes & Fix?

The most frequently replaced parts for Samsung Microwave C-22 Error Code - Causes & Fix are listed in the Parts Reference section of this guide with OEM part numbers and typical price ranges. Check the table for direct replacements.

Is Samsung Microwave C-22 Error Code - Causes & Fix a DIY repair or do I need a technician?

Sensor swaps, fan motor replacements, and condenser cleaning are typical DIY-level repairs. Anything involving refrigerant, gas, or high-voltage (>240V) work requires a licensed technician for both safety and code-compliance reasons.

Samsung Microwave C-22 Error Code - Causes & Fix

Samsung Microwave C-22 Error Code — What It Means

The C-22 error code on a Samsung microwave indicates a problem with the temperature sensor circuit. Samsung groups C-20, C-21, and C-22 under temperature sensor faults, and the sensor is either open (broken circuit) or shorted (unintended connection). The microwave uses this sensor to monitor cavity temperature, and when the control board cannot read valid data from the sensor, it halts operation and displays C-22.

This code does not point to a specific failed part on its own. It tells you the control board has detected an abnormal signal from the temperature sensor path, which could be the sensor itself, the wiring harness, the connector, or the control board input circuit.

Jump to Fix

Common Causes

Failed temperature sensor (thermistor) The thermistor mounted inside the cavity has burned out or drifted out of spec, causing an open or shorted reading at the control board.
Loose or corroded sensor connector The plug between the sensor harness and the control board has worked loose, collected moisture, or developed corroded pins that break the circuit.
Damaged sensor wiring harness The wire between the sensor and the board has been pinched, melted by heat exposure, or severed, creating an open or short condition.
Moisture or steam intrusion Heavy steam from cooking or a spill has condensed inside the control cavity or sensor area, temporarily shorting the sensor circuit.
Faulty main control board (PCB) The temperature sensor input circuit on the control board has failed, even though the sensor and harness test normal.

Step-by-Step Fix

Unplug the microwave at the wall or switch off the dedicated breaker, then wait 60 seconds to allow the control board to reset and any residual moisture to begin drying.
Restore power and run a short test cycle to see if the C-22 code reappears, since transient steam or a brief glitch can sometimes trigger a false sensor fault.
Disconnect power again and remove the outer cabinet panels (typically screws along the top and sides) to access the cavity interior and control board area.
Locate the temperature sensor, usually a small thermistor with two wire leads clipped or screwed to the cavity wall near the magnetron or waveguide cover.
Inspect the sensor connector and harness for loose pins, corrosion, burn marks, or damaged insulation, then unplug the connector and check for continuity across the sensor leads using a multimeter (consult your model’s service manual for the expected resistance range, as Samsung public support does not publish these values).
Replace the temperature sensor if the resistance reading is open (infinite) or near zero (shorted), or if the part shows visible heat damage or corrosion.
Test the microwave after reassembly. If the C-22 code persists and the sensor circuit tests good, the main control board is the next likely fault and should be replaced by a qualified technician.

Parts Often Needed

Part	Notes
Samsung microwave temperature sensor (thermistor)	Amazon \| Match by your exact Samsung model number, usually found inside the door frame or on the back panel.
Sensor wiring harness	Amazon \| Order only if the existing harness shows cut, melted, or corroded wires that cannot be repaired by cleaning the connector.
Main control board (PCB)	Amazon \| Required when the sensor and harness test normal but the C-22 code continues, order by model number and board part number.

When to Call a Pro

Call a professional if you are uncomfortable working inside the microwave cabinet (high-voltage capacitor shock hazard even when unplugged), if you cannot access or identify the temperature sensor, if the sensor tests normal but the code persists (pointing to a control board fault), or if your microwave is still under warranty. Samsung recommends contacting their service network whenever a temperature sensor code does not clear after a power reset, and many jurisdictions require licensed appliance technicians to perform control board replacement due to electrical and microwave radiation safety rules.