Whirlpool dryer — Error Code F22
The main control detects an open or shorted exhaust temperature thermistor.
What it means
The F22 error code on a Whirlpool dryer indicates a communication or hardware failure involving the exhaust temperature thermistor. The main electronic control board continuously monitors the resistance of this thermistor to regulate drum temperature and prevent overheating. At room temperature (around 77°F), a healthy Whirlpool exhaust thermistor should read approximately 10,000 ohms (10kΩ). If the control board detects an infinite resistance (an open circuit, >50kΩ) or near-zero resistance (a short circuit, <500Ω), it immediately halts the heating cycle and flags the F22 code to prevent thermal runaway. This is a hard fault, meaning the dryer will lock out heating operations until the resistance value returns to the expected operational range.
Likely Causes
- 1 Failed Exhaust ThermistorThe internal element of the thermistor has degraded or snapped, causing an open circuit. This is the most common cause of the F22 code.
- 2 Wiring Harness IssuesA loose connection, pinched wire, or corrosion at the thermistor plug or the main control board connector prevents the resistance signal from reaching the board.
- 3 Main Control Board FaultRarely, a damaged relay or blown trace on the main control board can cause it to misread a perfectly functioning thermistor.
How to clear / reset
To temporarily clear the F22 code, perform a hard power cycle. Unplug the dryer from the wall outlet or flip the dedicated dual-pole circuit breaker to the OFF position for 5 to 10 minutes. Restore power and attempt to run a timed dry cycle without heat. If the code clears, it may have been a transient voltage spike. However, because F22 is a hard component fault, the code will almost certainly return as soon as the control board polls the thermistor for a temperature reading. The only permanent way to clear this code is to replace the faulty thermistor or repair the broken wiring harness.
Common replacement parts
When to call a pro
Call a professional if you lack a digital multimeter to test thermistor resistance, or if replacing the thermistor does not clear the F22 code. Diagnosing a main control board or tracing continuity through the dryer's wiring harness requires electrical expertise and schematic reading. Axis Appliance Repair offers a $90 diagnostic (waived upon authorized repair) and backs all work with a 1-year parts and labor warranty. We carry OEM Whirlpool thermistors and control boards on our trucks to get your dryer running safely in one trip.
FAQs
How much does it cost to fix an F22 code?
A standard thermistor replacement usually costs between $120 and $180, including parts and labor. If the main control board is faulty, the repair can range from $250 to $450.
Can I fix the F22 error myself?
Yes, if you have a multimeter and basic hand tools. You can access the thermistor by removing the lower front or rear panel (depending on your specific model) and testing it for approximately 10k ohms at room temperature.
Will the F22 code clear itself?
No. It requires a hard reset, and if the thermistor has actually failed, the code will return immediately upon starting a new cycle.
How long does it take a pro to fix this?
A standard thermistor replacement takes an experienced technician about 30 to 45 minutes from initial diagnosis to final reassembly and testing.
Is it safe to keep using the dryer with an F22 code?
The dryer's control board will not allow you to run a heated cycle while this code is active. Bypassing the thermistor is an extreme fire hazard and should never be attempted.
Need help with F22?
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