Kenmore Dryer F31 Error: L2 Line Voltage Troubleshooting
Quick Answer
An F31 code on a Kenmore dryer indicates a loss of the L2 power leg, preventing the unit from heating. This is usually caused by a tripped circuit breaker, a loose wire at the terminal block, or a faulty power cord.
Here's what's actually happening: your dryer's getting power, but only half of it. Electric dryers need two 120V legs combining to make 240V, and one leg dropped out. So the motor runs fine on its 120V, the drum spins, but the heater circuit is completely dead. Ignore this and you risk a loose connection building heat behind your walls, which is honestly how dryer fires start.
OK so nine times out of ten when I get an F31 call, the dryer itself is totally fine. The problem's either at the breaker box, the outlet, or the terminal block on the back of the machine. I replaced a melted terminal block on one of these just last week, and the homeowner had been smelling something funny for months. This is a super common call in older homes with aging wiring or after any kind of power surge, and the fix ranges from completely free (flip the breaker) to maybe $200 if the control board got damaged.
Most Likely Causes
Based on aggregated repair data, here is the probability breakdown for this error code:
Circuit Breaker or House Wiring50%
Power Cord or Terminal Block35%
Main Control Board Failure15%
Symptoms You May Notice
Drum spins normally and the timer counts down, but clothes come out cold and damp no matter how many cycles you run.
F31 flashing on the display right when the cycle would normally start heating up, sometimes with an audible beep.
Faint burnt smell near the back of the dryer or right at the outlet, especially noticeable right after you try to run a load.
Dryer starts, runs for 30 to 60 seconds, then shuts itself off once the board confirms heat isn't coming on.
Won't start at all, just blinks the error code immediately, usually when the voltage drop is bad enough that the board won't even attempt to run.
Can you reset a Kenmore dryer to clear the F31 code?
Fix the actual cause first, whether that's resetting the breaker, tightening the terminal block, or replacing a damaged cord. Then unplug the dryer completely and leave it unplugged for at least 5 full minutes so the control board discharges. Plug it back in, select a timed dry cycle, and hit start. If F31 comes right back, the voltage issue isn't resolved yet. A clean cycle without the code means you're good.
Tools Required for Diagnosis
Phillips #2 screwdriver5/16" nut driverFlathead screwdriverMultimeter rated 600V CAT II or higherFlashlight or headlampNon-contact voltage tester (optional but helpful)
Diagnostic Checklist
Follow these steps in order. We start with the easiest external fixes before opening up the machine.
ComponentComponent Under Test
Expected Range220–250 VAC
ConditionIf Open (OL) or infinite, replace component.
Frequently Asked Questions
Why does my dryer spin but not heat when F31 is displayed?
Electric dryers are basically running on two separate 120V circuits that add up to 240V together. The motor only needs 120V, which is the L1 leg, so it'll spin just fine even when L2 is completely gone. But the heating element needs the full 240V to fire. When the board sees L2 is missing, it throws F31 and kills the heater. So yeah, everything looks normal on the outside. Drum spins, timer counts down, you pull out a soaking wet load. That's the F31 experience.
Can a bad thermal fuse cause an F31 error?
Nope, those are totally different problems. A blown thermal fuse usually means the dryer runs with no heat or sometimes won't start, but the board doesn't tie that to F31. F31 is specifically the control board saying it checked the incoming voltage and L2 isn't there. Two separate circuits, two separate failure modes. If you already replaced the thermal fuse and still got F31, the fuse wasn't your issue.
Is it safe to keep using the dryer if the F31 code is intermittent?
Honestly, no. Don't do it. An intermittent F31 almost always points to a loose connection that's building heat every time you run a load. I've seen dryers that were 'mostly working fine' pull the outlet box halfway off the wall because the wiring behind it got so degraded. Dryer fires are real and a loose 240V connection is one of the leading causes. Find it now.
How much does it cost to fix an F31 error?
Totally depends on what's wrong. Tripped breaker? Free. New power cord? $20 to $40 depending on 3-prong vs 4-prong. Terminal block? About $15 to $25 for the part plus maybe 30 minutes of your time. New wall outlet with an electrician? Figure $80 to $120. Main control board? That's the painful one. Boards for Kenmore dryers usually run $150 to $300 for the part alone, so you're looking at $300 to $450 all-in for the worst case.
Will the F31 code come back after I reset it?
If you just unplug and replug without fixing the voltage issue, yeah, it'll come right back on the next cycle. The reset clears the error from the display but the board will check voltage again when you start a load and throw F31 again immediately. Fix the root cause first, then do the reset. If it comes back after that, something's still wrong.
Could my house wiring be causing this even if the dryer is fine?
Absolutely. Older homes with undersized wire runs or aluminum wiring can have enough voltage drop under load to trigger F31 even when the dryer itself is perfect. Also, if the dryer circuit is sharing a panel slot or running on a long wire run, the voltage can sag under heavy current draw. Less common than the usual suspects, but if you've replaced everything and still get F31, have an electrician check the circuit before you spend money on a control board.
Models Known to Experience F31 Errors
This repair applies to most Kenmore dryers with this error code. Common model numbers include: