The F9 E2 code means your dryer's outlet thermistor has failed or has a bad connection. To fix it, unplug the dryer, locate the sensor on the blower housing, and test it with a multimeter for 10,000 ohms of resistance. If it's dead, a simple twenty dollar sensor replacement usually solves the problem.
Ignore this code and you're either scorching clothes or triggering a shutdown every single cycle. I ran into three of these just last week. Usually it's the sensor itself or a connector that rattled loose over years of vibration. The part's cheap, fifteen to twenty bucks, and the fix takes under an hour if you know where to look. But seriously, clean your vent first before you buy anything.
OK so here's the deal. That little sensor at the back of your dryer's exhaust duct has either died or lost its connection to the control board. Without it, your dryer's basically flying blind on temperature. Costs almost nothing to fix. But before you order anything, go check your vent first, because a clogged vent kills these sensors way faster than anything else and it might be all you need to do.
Most Likely Causes
Based on aggregated repair data, here is the probability breakdown for this error code:
Defective outlet thermistor75%
Wiring harness or connector issues15%
Main control board failure10%
Symptoms You May Notice
F9 E2 flashes on the display, sometimes mid-cycle and sometimes the second you hit Start, and it won't go away no matter how many times you restart.
The drum keeps spinning but there's zero warm air coming out the vent because the dryer dropped into sensor-safe mode and cut all heat.
Clothes come out damp after a full 60-minute cycle because the dryer killed the heat early as a precaution.
The error shows up right at the end of a long hot cycle, disappears if you wait 30 minutes, but comes right back the next run.
Dryer stops after about 10-15 minutes every single time, code appears, no finishing the cycle.
Can you reset a Whirlpool dryer to clear the F9 E2 code?
After cleaning the vent or replacing the thermistor, unplug the dryer completely for at least 60 seconds so the control board clears the stored fault. Plug back in, press Power, then Start. F9 E2 should be gone. If it comes right back before the drum even gets warm, you've got either a wiring issue or, in rare cases, a defective new thermistor.
With the dryer in standby, press any three buttons (except Power or Start) in a 1-2-3, 1-2-3, 1-2-3 sequence within 8 seconds. This will enter the diagnostic mode and display the most recent error codes.
Diagnostic Checklist
Follow these steps in order. We start with the easiest external fixes before opening up the machine.
ComponentComponent Under Test
Expected Range8000–12000 ohms
ConditionIf Open (OL) or infinite, replace component.
Replacement Parts
If your diagnostic testing proves the component has failed, you will need a replacement. We recommend OEM parts over aftermarket for water-handling components.
Part Name
OEM Number
Estimated Price
Outlet Thermistor (Exhaust Temperature Sensor)WP8577274 · $10–$20
WP8577274
$10 – $20
Frequently Asked Questions
What is the correct resistance for a Whirlpool dryer outlet thermistor?
Right around 10,000 ohms at room temperature, which is about 77 degrees F. Anywhere between 8K and 12K is acceptable. The resistance goes up when it's cold and down when it's hot, so if you're testing in a cold garage in winter you might see 13-15K ohms and that's actually fine. What you're really hunting for is OL (open circuit) or zero ohms, because those two readings mean the thermistor's dead. If you get a number in that 8K to 12K range at normal room temp, the sensor itself is probably not your problem and you should be looking at the connector and harness instead.
Can F9 E2 be caused by a clogged vent even if the thermistor is fine?
Yeah, this is actually the most common scenario I run into. The vent gets clogged, exhaust temps spike way past normal, and the thermistor reads an out-of-range temperature and triggers F9 E2 as a legitimate overheat warning, not because it failed. Always clean the vent first, before you buy anything or take anything apart. I've shown up to jobs where the homeowner already ordered a new thermistor and the vent was the whole problem. Clean the vent, run a test cycle, see if the code comes back. Takes maybe 20 minutes and might save you the cost of a part you don't need.
Is F9 E2 the same fault as E1 on Whirlpool dryers?
Not exactly. F9 E2 points specifically at the outlet thermistor, the one sitting at the exhaust duct. E1 is a more general thermistor fault code that could mean either the inlet or exhaust sensor depending on your specific model. If your older Whirlpool just shows E1 without the F9 prefix, you should check both sensors. The inlet thermistor is usually mounted near the heating element in the back of the drum area. Replacing the wrong sensor is a frustrating mistake, so confirm which one your model is pointing at before you order a part.
How long does a dryer thermistor last?
Under normal conditions these things should last the full life of the dryer, honestly. 10 to 15 years is realistic. Where I see them fail early is on dryers that've been running with restricted airflow for a long time. You've got a kinked duct behind the dryer, or nobody ever cleans the vent, and that thermistor is getting cooked hotter than it was designed for every single cycle. It'll fail at 4 or 5 years instead of 12. Heavy use is the other factor. Running 10+ loads a week puts way more total heat cycles on the sensor than a normal residential dryer ever sees.
Can I bypass the outlet thermistor temporarily to run laundry?
No. Don't do this. Bypassing the thermistor means the control board has zero visibility into exhaust temperature. If the heating element gets stuck on or something else goes wrong, there's nothing left to catch it on the exhaust side. That's an actual fire hazard. The part is ten to twenty dollars and available with next-day shipping. Use a laundromat for one day. It's genuinely not worth the risk.
What part number do I need for the Whirlpool outlet thermistor?
For most WED-series Whirlpools made after 2014, you're looking at WP8577274 or W10316760. Pull your model number off the sticker inside the door opening on the front of the dryer and cross-reference it on the Whirlpool parts site or RepairClinic before you order. These sensors run about ten to twenty dollars. Get an OEM part if you can. I've seen a handful of aftermarket ones fail within a year, which is annoying when the original lasted eight years just fine.