The F4 error on your Maytag Washer means the control board has detected a problem with the water temperature sensor or a heating-related fault during the wash cycle. This usually stops the cycle to protect the machine, and it can often be fixed by checking wiring connections and the sensor itself.

Error code F4
Meaning Water temperature sensor (thermistor) fault or heating circuit malfunction
Severity Medium — the washer may still run but cycles can be interrupted or skipped
Time to fix 15–40 minutes
Tools needed Multimeter, Phillips screwdriver, flashlight

What the F4 error means

The F4 code appears when the washer’s control board can’t get a proper reading from the temperature sensor, or detects that water isn’t heating or cooling as expected during a cycle. This sensor tells the machine whether the water is hot, warm, or cold enough for the selected wash setting. When the signal is missing, inconsistent, or out of range, the control board flags F4 and may pause or cancel the cycle.

This is different from codes like the Maytag Washer F1 Error Code, which points to a control board issue rather than a sensor fault, so it’s worth confirming you’re dealing with F4 specifically before starting repairs.

Common causes

  • Faulty or failing water temperature sensor (thermistor)
  • Loose, corroded, or disconnected wiring harness at the sensor
  • Sensor coated in mineral buildup or sediment affecting readings
  • Water inlet valve not delivering water at the correct temperature
  • Control board malfunction misreading a normal sensor signal
  • Wiring damage from wear, rodents, or installation issues

How to fix the F4 error

  1. Power cycle the washer — Unplug the machine for 60 seconds, then plug it back in. This clears minor control board glitches that can trigger a false F4 reading.
  2. Check the water supply — Make sure both hot and cold water taps are fully open and supplying water at normal pressure and temperature. A weak hot water line can trigger this code.
  3. Inspect the sensor wiring — Unplug the washer, remove the rear or control panel (check your model’s access point), and look for loose connectors or damaged wires near the temperature sensor.
  4. Test the temperature sensor — Using a multimeter, check the sensor’s resistance against the manufacturer’s spec at a known water temperature. Replace it if readings are outside range or show no continuity.
  5. Clean or replace the sensor — If the sensor is coated in scale or debris, clean it gently. If it still fails testing, replace it with an OEM part matched to your model number.
  6. Call a technician if the error persists — If wiring and sensor checks pass but F4 keeps returning, the control board itself may need replacing, which is best handled by a qualified appliance repair professional.

FAQ

Can I still use my washer if it shows F4?
You may be able to run a cycle, but water temperature won’t be regulated correctly, which can affect wash performance and fabric care. It’s best to fix the issue before continuing regular use.

Is the F4 error the same on all Maytag washer models?
No. Some models use F4 for temperature sensor faults while others may pair it with a sub-code. Check your owner’s manual for your exact model to confirm the meaning.

How is F4 different from F2 or F3 errors?
F4 relates to temperature sensing, while other codes like the Maytag Washer F2 Error Code and Maytag Washer F3 Error Code point to separate faults such as motor or sensor communication issues, so troubleshooting steps differ.