Whirlpool Dryer F-22 Error Code — What It Means & How to Fix

You load a wet batch of towels, hit start, and three minutes later your Whirlpool dryer stops dead with F-22 flashing on the display. The drum's barely warm. You restart it — same thing. F-22 again.

This isn't a fluke. Your dryer thinks the exhaust temperature is dangerously high, even though the drum feels cold to the touch.

What F-22 Actually Means

The F-22 error code stands for "Exhaust Thermistor Shorted." Your Whirlpool dryer uses a thermistor (a temperature-sensitive resistor) to monitor the air temperature leaving the drum. When the control board reads a resistance value that's impossibly low — typically below 500 ohms at room temperature — it assumes the thermistor circuit has shorted and triggers F-22 to prevent a potential fire hazard.

Here's the thing: the thermistor itself rarely shorts. What happens more often is the wiring harness connector corrodes, moisture gets into the connection, or lint buildup creates a conductive path. Sometimes the thermistor just fails open or drifts out of spec after years of heat cycling.

The part number you need is 8577274 — it replaces WP8577274, AP6013514, and older numbers like 3976615 and 3390292. This exact thermistor fits dozens of Whirlpool, Maytag, Kenmore, KitchenAid, and Amana dryers including models WED9200SQ0, WED8300SW1, WED85HEFW0, and WED8500DW0.

Most Likely Causes

1. Failed thermistor (sensor reads out of range)
The thermistor's resistance changes with temperature. At 70°F it should read around 50,000 ohms. When it fails, it either reads zero (shorted), infinite (open), or a wildly wrong value. The control board sees this and throws F-22. This is the cause in roughly 70% of cases.

2. Corroded or moisture-damaged wire connector
The thermistor plugs into a two-wire harness connector near the blower housing. Lint dust mixed with humidity creates a conductive sludge that can short the circuit. Sometimes you'll see green corrosion on the terminals. Happens in about 20% of cases, especially in humid climates or laundry rooms.

3. Pinched or damaged wiring harness
If someone reinstalled the dryer drum or blower housing incorrectly, the thermistor wires can get pinched against a sharp metal edge. The insulation wears through and the wires short together or to the frame. Less common — maybe 8% of cases — but it happens during DIY repairs.

4. Failed control board misreading the sensor
Rarely, the control board's thermistor input circuit fails and misinterprets a good sensor reading as a short. This is only about 2% of cases, but if replacing the thermistor and checking connections doesn't fix F-22, the board is suspect.

Step-by-Step Fix

Safety first: Unplug the dryer completely. Even "off" dryers have live voltage at the terminal block.

Step 1: Access the thermistor
The exhaust thermistor is mounted on the blower housing at the back of the dryer. On most Whirlpool models, you'll need to remove the lower front panel (two screws at bottom corners, lift up and pull forward), then the front drum panel (screws along the top edge under the lint screen). This gives you access to lift the drum out and reach the rear blower area.

Step 2: Test the existing thermistor
Before ordering parts, disconnect the two-wire connector from the thermistor and use a multimeter set to ohms. Touch the probes to the thermistor terminals (not the harness). At room temperature (70°F) you should read approximately 50,000 ohms (50kΩ). If you read zero, infinite, or anything under 10,000 ohms, the thermistor is bad.

Step 3: Inspect the connector and wiring
Look closely at both sides of the connector. Any green corrosion? Melted plastic? Moisture? Check the wires for 6 inches back from the connector — look for abraded insulation or pinch marks. If the connector is corroded but the thermistor tests good, clean the terminals with electrical contact cleaner and a small wire brush.

Step 4: Install the new thermistor
The 8577274 thermistor mounts with a single quarter-inch hex-head screw or a push-in clip (varies by model). Remove the old one, press the new thermistor into the same bracket, and reconnect the wire harness. Make sure the connector clicks firmly — a loose connection can cause intermittent F-22 errors.

Step 5: Test before reassembly
Plug the dryer back in temporarily (leave panels off for now). Start a timed dry cycle and let it run for 5 minutes. If F-22 doesn't reappear and the drum heats normally, you're good. If F-22 comes back immediately, recheck your connections or test the control board's thermistor circuit.

Step 6: Reassemble and run a full cycle
Reinstall the drum, front panel, and lower panel in reverse order. Run a full normal cycle with a load of damp towels to confirm the dryer heats properly and completes without errors.

When the Fix Doesn't Work

If you've replaced the thermistor, verified all connections are clean and tight, and F-22 still appears, the problem is likely the main control board. The board's thermistor input circuit may have failed. You'll need part number W10111615 or equivalent for most Whirlpool models (check your model's wiring diagram). Control board replacement is more expensive — around $150-$250 for the part — but the install procedure is similar.

Alternatively, if F-22 appears intermittently only when the dryer vibrates or you bump it, you've got a bad solder joint on the control board or a wire with a broken internal conductor. These are harder to diagnose without a wiring schematic and some electrical troubleshooting experience.

Frequently Asked Questions

Can I bypass the thermistor to test if it's bad?

Technically yes — if you disconnect the thermistor and jumper the two harness wires together with a 50kΩ resistor, the dryer should run normally if the thermistor was the problem. But don't leave it bypassed. The thermistor is a critical safety device that prevents overheating fires. Use this only as a 30-second diagnostic test, then install the proper replacement part.

Why does F-22 appear only on high heat settings?

If F-22 only triggers on high heat, you may have a clogged exhaust vent causing real overheating, which pushes the thermistor reading into the fault range. Check that your vent duct isn't kinked, crushed, or packed with lint. A restricted exhaust can make a borderline-failing thermistor throw the error code under heavy heat load.

Is the 8577274 thermistor the same as the cycling thermostat?

No. The thermistor (8577274) is the exhaust temperature sensor that triggers F-22. The cycling thermostat is a separate bimetal switch that controls the heating element on/off cycling. They're both on the blower housing but serve different functions. F-22 specifically indicates the thermistor circuit, not the thermostat.