Whirlpool Dryer Error Code f:31

The F:31 error code on a Whirlpool dryer indicates a low voltage condition on the L2 leg of the 240-volt supply circuit. Electric dryers in North America operate on a split-phase 240-volt supply, meaning two separate 120-volt legs (L1 and L2) must both be present and delivering adequate voltage for the dryer to operate correctly. When the electronic control detects less than 30 volts on the L2 line, it logs the F:31 fault. This code only appears during Diagnostic Test Mode, so it will not surface during normal operation unless you actively run the diagnostic sequence.

The most common trigger for this fault is a partial power loss at the service panel. In a split-phase system, each 120-volt leg is protected by one pole of a double-pole circuit breaker (or, in older homes, by individual fuses). If one pole trips or one fuse blows while the other remains intact, the dryer receives only 120 volts instead of 240 volts. The motor may still run in this condition, but heating will be absent or severely reduced, and the control board will flag L2 undervoltage. Wiring problems at the outlet, a damaged or improperly seated power cord, or loose relay connections on the electronic control board can also produce this reading.

Diagnosing F:31 begins at the service panel, confirming both poles of the breaker are fully seated and functional, followed by verification of proper power cord installation and secure connection at the wall outlet. After ruling out supply-side issues, the relay connections on the electronic control board should be inspected for corrosion, looseness, or damage, since a failed relay or poor connection can interrupt L2 continuity within the appliance itself.