Viking Over-the-Range Microwave Hood Code Er01: sensor cooking cannot detect vapor

What Er01 means

On the Viking VMOH330SS over-the-range microwave hood (2019 model), Er01 stands for a sensor error. It appears when sensor cooking cannot detect the vapor coming off the food, so the oven cannot finish the cycle by itself. The display shows Er01 and the cycle ends early. The official remedy is to press STOP/CLEAR and cook by time, so this is mostly a cooking-mode message rather than a part that failed.

Common causes of Er01

Food that gave off too little vapor for the sensor cycle to measure
Covered or sealed containers that trap steam, or a wet or dirty oven interior
A door opened during the sensor phase, which disturbs the reading
A vapor sensor or its connection that no longer reports correctly, if the code returns on every sensor cycle

✓ One safe check you can try

1. Press STOP/CLEAR to clear Er01. 2. Wipe the cavity and the door seal so steam can vent. 3. Leave sensor foods loosely covered and do not open the door during the sensor stage. 4. Finish the food using a set time and power level. 5. Try a sensor program again once with a different food before deciding anything.

! Why to stop there

Opening the microwave to reach the sensor is unsafe because the high-voltage parts hold charge after unplugging
The code often clears with a change in how the food is covered
Repeat appearances on different foods are the point where an inspection helps

Opening a panel yourself does not automatically cancel a manufacturer warranty, but it can cause accidental damage, and some manufacturers set their own service conditions. Check your warranty terms, or ask us, before deciding.

→Same appliance

Other Microwave codes

Display flashesViking Microwave Drawer Display Flashes: Power Was Interrupted Earlier ERRORViking Sensor Microwave Message "ERROR": vapor not detected or entry out of range ERROR WEIGHT TOO SMALL OR TOO LARGEViking Convection Microwave Hood Message "ERROR WEIGHT TOO SMALL OR TOO LARGE": weight outside the allowed range

Er01Er01 questions

Can I keep using the microwave with Er01?

Yes. Press STOP/CLEAR and cook by time. Only the sensor feature is affected, and normal timed cooking, defrosting and reheating all work the same way as before.

Why does Er01 show up on some foods only?

The sensor looks for vapor. Dry foods or tightly sealed containers give it little to measure, so those cycles end early. Foods that steam freely rarely trigger the code at all.

When is a repair worth booking?

If Er01 returns on every sensor program with ordinary moist food, a technician should check the sensor path. We give a written price before starting and stand behind the work for 30 days.