The E45 error on your Frigidaire washing machine means the main control board has lost communication with the motor control unit. This is usually caused by a loose wiring connection or a fault in one of the two boards, and it often clears after a power reset.

Error code E45
Meaning Communication failure between the main control board and the motor control unit (MCU)
Severity Medium — the washer usually won’t start or complete a cycle until fixed
Time to fix 15–45 minutes
Tools needed Screwdriver, multimeter (optional, for testing wiring)

What the E45 error means

Frigidaire washing machines use two separate boards to run the machine: a main control board that reads your settings and a motor control unit that drives the drum motor. The E45 code appears when these two boards stop talking to each other, which stops the wash cycle in its tracks.

This is similar in concept to communication faults seen on other appliances, such as the Frigidaire EF Error Code on refrigerators, where two components fail to exchange signals correctly.

Common causes

  • Loose or corroded wiring harness connector between the main board and motor control unit
  • A temporary software glitch after a power surge or brownout
  • Failed or damaged motor control board
  • Failed main control board
  • Poor grounding causing electrical interference between boards
  • A pinched or damaged wire from vibration during spin cycles

How to fix the E45 error

  1. Power cycle the washer: Unplug the machine for 2–3 minutes, then plug it back in. This clears many temporary communication glitches.
  2. Check the wiring harness: Unplug the washer, remove the rear or top panel, and inspect the wiring connector between the main control board and the motor control unit for looseness, corrosion, or damage.
  3. Reseat all connections: Firmly disconnect and reconnect the harness plugs at both boards to ensure a solid connection.
  4. Inspect for damaged wires: Look along the wiring path for pinched, frayed, or melted sections, especially near moving parts, and replace damaged wiring if found.
  5. Test the motor control unit: If wiring looks fine, the MCU may be faulty. A qualified technician can test it with a multimeter and replace it if needed.
  6. Replace the main control board: If the error persists after checking wiring and the MCU, the main control board itself may need replacing.

FAQ

Can I fix the E45 error myself?
A power cycle and a visual check of the wiring connections are safe DIY steps. Testing or replacing control boards is best left to a technician unless you’re comfortable working with appliance electronics.

Will the E45 error clear on its own?
Sometimes, if it was caused by a brief power surge. If it returns after resetting the machine, there’s likely a wiring or board issue that needs attention.

Is it safe to keep using the washer with this error?
No. The washer typically won’t run a cycle correctly with an E45 error, so it’s best to address the fault before running more loads.