What Does Monogram Freezer Error Code 1 Mean?
Error code 1 on a Monogram freezer indicates a refrigerant/thermistor sensor fault. The temperature sensor (thermistor) that monitors the freezer compartment or the evaporator area is reporting an out-of-range reading. Without accurate temperature data, the control board cannot manage the compressor and defrost cycles properly.
Common Causes
- Failed thermistor – The sensor’s resistance has drifted outside the expected range or it has failed open/short circuit.
- Loose sensor connector – The wiring connector to the thermistor has come loose.
- Sensor encased in ice – Excessive frost buildup has surrounded the thermistor, affecting its reading accuracy.
- Wiring damage – The thin wires leading to the sensor have been pinched or broken.
How to Troubleshoot
- Manual defrost – If heavy frost buildup is present, unplug for 24 hours to let it melt. The sensor reading may normalize once ice clears.
- Hard reset – Restore power after defrosting and check if error code 1 clears.
- Check for recurrence – If error 1 returns within a few hours, the thermistor needs replacement.
When to Call a Professional
Thermistor testing requires a multimeter and access to the freezer compartment wiring. Call 844-752-7887 for certified Monogram freezer repair.