What Does Monogram Dryer Error Code E4 Mean?

Error code E4 on a Monogram dryer indicates an open circuit in the inlet thermistor. Unlike E2 (which is a short circuit), an open-circuit thermistor reads infinite resistance — meaning the electrical path through the sensor is broken. The control board cannot receive any temperature data from the inlet, triggering E4 and halting the cycle.

Common Causes of E4

  • Failed inlet thermistor (open internal element)
  • Broken wire or disconnected connector in the thermistor circuit
  • Corroded or burned terminal pins on the connector
  • Control board wiring harness damage

How to Troubleshoot E4

  1. Power reset: Unplug for 60 seconds and restart. Reconnect power and check if E4 clears.
  2. Check the thermistor connector: With the dryer unplugged, trace the wiring from the inlet thermistor to the control board. Look for a disconnected plug, broken wire, or burned terminal.
  3. Test the thermistor: Disconnect the thermistor and test with a multimeter. No continuity (OL/infinite resistance) at any temperature confirms an open circuit — replace the thermistor.
  4. Inspect the wiring harness: If the thermistor tests correctly in isolation, the fault is in the wiring. Repair or replace the damaged section of the harness.

If you are unsure how to test components safely, call our Monogram dryer repair team at 844-752-7887.

Need Help? If the error code hasn't resolved after basic troubleshooting, call our certified Monogram technicians at 844-752-7887 for professional diagnosis and same-day repair.