Electrolux Dryer Error Code 0x31

Error code 0x31 means the conductimetric humidity sensor is producing a frequency signal that is too high for the control board to accept as valid. This sensor is responsible for detecting moisture levels in the drum so the dryer knows when clothes are dry. The code points to either a wiring problem between the sensor and the control board or a defective main control board. Start by checking that all humidity sensor wiring terminals are securely connected.

Running the dryer while the humidity sensor circuit is faulted is not recommended. Without an accurate moisture reading, the dryer cannot properly regulate the drying cycle, which can lead to over-drying, excessive heat buildup, or extended run times. It is best to resolve the fault before continuing normal use.

If the fix is simply reseating a loose wiring terminal, there may be no parts cost at all, though a service call to diagnose the issue typically runs in the range of $75 to $150. Replacing a wiring harness or humidity sensor generally adds $30 to $100 in parts. A main control board, which is the most expensive possible cause, can range from $150 to $350 or more depending on the specific model, plus labor if a technician performs the repair.

A homeowner or DIYer comfortable working with appliance wiring can attempt the basic diagnostic steps, which include inspecting and reseating the humidity sensor wiring terminals and cleaning the sensor bars in the drum. If the issue turns out to be a damaged wiring harness or a failed main control board, those repairs are more involved and may warrant calling a qualified technician. Always disconnect power to the dryer before inspecting any internal wiring.

A power reset may temporarily clear the code, but it will return if the underlying wiring or component fault has not been corrected. Resetting is useful for confirming whether the fault is intermittent, but it is not a fix. The wiring connections and sensor should be inspected and repaired before relying on the dryer again.