Error code · Professional Range

Monogram ZGP Range Code F4: Shorted oven sensor

Medium · inspection needed

Code: F4
Appliance: Professional Range
Brand: Monogram
Warranty: 30-day workmanship

What F4 means

F4 on a Monogram ZGP professional gas range, such as the ZGP486ND or ZGP366N, means the oven control sees a shorted oven temperature sensor. The control reads the sensor's resistance, and a value under 950 ohms is treated as a short. A healthy sensor reads roughly 1080 ohms at room temperature and shifts by about 2 ohms for each degree of temperature change. The control stores F4, and the oven may not heat or may stop in the middle of a cycle.

Common causes of F4

Oven sensor shorted internally
Sensor lead pinched or touching metal
Connector contact problem at the control
Control misreading the sensor input

✓ One safe check you can try

1. Let the range cool completely with the controls off. 2. Start a short bake at a moderate setting to see if F4 returns. 3. If F4 shows again, stop using that oven and call us with the code. 4. Keep the door closed while the range is cooling down.

! Why to stop there

A short can sit in the sensor, its lead or the connector, and we cannot see which from the code alone
We measure the sensor at room temperature and compare it with the expected range
The control is considered only after the sensor and wiring are cleared

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 Professional Range codes

ProdMonogram ZGP Range Code Prod: Factory test mode CXMonogram ZGP Range Code CX: Communication error C1Monogram ZGP Range Code C1: Main relay board link C2Monogram ZGP Range Code C2: Upper temperature encoder C3Monogram ZGP Range Code C3: Upper mode encoder C4Monogram ZGP Range Code C4: Auxiliary relay board link C5Monogram ZGP Range Code C5: Lower temperature encoder C6Monogram ZGP Range Code C6: Lower mode encoder

F4F4 questions

What does F4 mean on a ZGP?

The oven temperature sensor looks shorted to the control. That means it reads far lower in resistance, under 950 ohms, than a healthy sensor does at room temperature.

Why does room temperature matter?

The sensor's resistance changes with heat, so a fair measurement is taken when the oven is cold. We then compare what we read with the value a good sensor should show.

Is a replacement sensor always the answer?

No. A pinched lead, a lead touching metal or a poor connector can cause the very same reading, so we inspect all of those before we order anything for your range.

Book a visit

Still seeing F4?

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

(713) 955-0955