Dishwasher High Severity
F8E4 Appliance Error Code

Maytag Dishwasher F8E4 Error: Heater relay stuck

What Does Maytag Dishwasher Error Code F8E4 Mean? F8E4 on Maytag JetClean and MDB dishwashers signals the heater relay on the main control board has failed in the closed position — the relay has welded contacts. The heater stays energized when the control commands it off, causing water temperature to rise uncontrolled. This is a […]

Quick Assessment

Answer to continue safely

Is it safe to keep using?

No. Uncontrolled heating is a fire and burn hazard. Do not restore power until the control board is replaced.

Can I reset the code?

No. A welded relay is a hardware fault. A reset clears the display but the runaway heat returns as soon as the cycle heats.

When to stop immediately?

Stop if you notice: F8E4 appears, Any hot-plastic or burning smell.

Symptoms You May Notice

Water becomes excessively hot during cycle

Tub temperature rises well above the target 140°F.

Steam or hot smell during cycle

Excessive heat produces steam or a warm-plastic smell.

F8E4 shown mid-cycle with cycle halted

Thermistor detects runaway heat and control shuts down the cycle.

Steam escaping around door seal

Visible steam vents from the door edges, and opening the door reveals extremely hot water and steam.

Possible Causes

1

Welded heater relay contacts

Relay on the control board has arced and fused in the closed position.

Requires Professional
2

Failed control board firmware

Rare — control is commanding the heater on when it should not.

Requires Professional
3

Short in heater circuit wiring

Wiring to the heater has shorted to a hot supply line.

Requires Professional

Safe Checks You Can Do

These checks are safe for homeowners. No disassembly required. Do not remove panels or access internal components.
  1. 1

    Cut power immediately

    Turn off the dishwasher circuit at the breaker. Do not just press Cancel — the stuck relay may not respond to control input.

    Breaker is the only reliable disconnect for a welded relay.

  2. 2

    Let the tub cool before opening

    Leave power off for 1 hour. Open the door only after the tub has cooled.

    Steam from a overheated dishwasher can burn — be cautious.

When to Call a Professional

Contact a qualified technician if:

  • Heater relay measures 0 ohms when de-energized
  • Water reaches 180°F+ in a normal cycle
  • Any burn marks on the control board

Need Professional Help?

Find qualified technicians in your area for proper diagnostics and repair.

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