Error code · Microwave & Advantium

Monogram Advantium 240 Code Upper Thermal Sensor OPEN: upper sensor circuit broken

Medium · inspection needed

Code: Upper Thermal Sensor OPEN
Appliance: Microwave & Advantium
Brand: Monogram
Warranty: 30-day workmanship

What Upper Thermal Sensor OPEN means

On Monogram Advantium 240 ZSC2200-series speedcook ovens (ZSC2200, ZSC2201 and ZSC2202), Upper Thermal Sensor OPEN is what our technician reads in the service test when the circuit of the upper thermal sensor is broken. The service test is entered with the SPEED COOK pad and the knob held for 3 seconds. The owner sees only the scrolling message SERVICE MAY BE NEEDED, and the oven may stop cooking. The reading is confirmed for the 240-volt Advantium only.

Common causes of Upper Thermal Sensor OPEN

Upper thermal sensor wire or connector
Sensor itself reading open
Harness between the sensor and control
Control board input

✓ One safe check you can try

1. Stop the cooking and let the oven cool with the door closed. 2. Check that nothing blocks the vents around the oven. 3. Wipe the cavity clean after it cools. 4. Run a short cook to see whether the message comes back. 5. Call us if SERVICE MAY BE NEEDED scrolls again.

! Why to stop there

The owner message does not name the upper sensor, so only the service test shows it
We check the sensor circuit and connectors before replacing anything
We confirm the oven heats correctly once the circuit reads normal

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.

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Other Microwave & Advantium codes

DEMO ModeMonogram Advantium 240 Mode DEMO: Showroom Setting Active Lower Thermal Sensor OPENMonogram Advantium 240 Code Lower Thermal Sensor OPEN: bottom sensor disconnected Lower Thermal Sensor SHORTEDMonogram Advantium 240 Code Lower Thermal Sensor SHORTED: bottom sensor shorting out Humidity Sensor OPENMonogram Advantium 240 Code Humidity Sensor OPEN: moisture sensor circuit broken Abnormal High TempMonogram Advantium 240 Code Abnormal High Temp: cavity hotter than the setting F1Monogram Advantium 120 Code F1: cavity thermistor reads open F2Monogram Advantium 120 Code F2: thermistor in the cavity is shorted F3Monogram Advantium 120 Code F3: key panel circuit shorted

Upper Thermal Sensor OPENUpper Thermal Sensor OPEN questions

How do you know it is the upper sensor?

Our technician puts the oven into its service test, and the control lists which sensor it found open. On the display you only get the scrolling message.

Will the oven still cook?

It may refuse to continue, since the control cannot read the cavity temperature without that sensor. Do not run it repeatedly to find out. We will check the sensor circuit before the oven runs again.

Is an open reading the same as a shorted one?

They are different conditions of the same sensor circuit. Open means a broken path, shorted means the path has collapsed. We test both the same way with the oven cool.

Book a visit

Still seeing Upper Thermal Sensor OPEN?

A technician diagnoses it on site and gives you the price in writing before any work starts.

(713) 955-0955