Whirlpool · Dishwasher Serious

F4E3 — Circulation Pump Communication Error

The control board cannot communicate with the variable-speed circulation (wash) pump motor. The dishwasher will not run a wash cycle.

Keep using it?
Limited use only
DIY difficulty
Moderate
Verified against
applianceaid.com ↗

How to fix it

  1. Power off at the breaker.
  2. Pull the toe-kick and locate the harness running to the circulation pump (large round motor on the side of the sump).
  3. Unplug and reseat both ends of the harness. Look for melted or discolored connectors.
  4. If the harness is good, run the service diagnostic — pump should run smoothly. If it does not, replace the circulation pump/motor assembly.
  5. If pump tests good but F4E3 persists, replace the control board.

Why it happens

Typical signs: F4E3 on display · No wash spray action · Cycle stops shortly after starting · Pump may hum briefly then stop

  • Loose or damaged wire harness between control and pump Connector at the pump or board has backed out, or harness is pinched.
  • Failed circulation pump motor The brushless DC pump motor's electronics have failed.
  • Failed control board Less common — only after ruling out harness and pump.

Parts you may need

If diagnosis points to a failed part, these are the common replacements. As an Amazon Associate we earn from qualifying purchases.

  • Whirlpool dishwasher circulation pump motor Common replacement
    Amazon →

More Whirlpool dishwasher codes

E1 E1 — Fill / Water Supply Problem (legacy code) E4 E4 — Overfill / Water in Drip Tray F1E1 F1E1 — Control Module Fault F1E2 F1E2 — Incompatible or Failed Control Board F2 F2 — Water leak detected F3E1 F3E1 — Thermistor/OWI Sensor Open

All Whirlpool codes → All dishwasher codes →

Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician. Verified against manufacturer documentation: applianceaid.com.