Lincoln Impinger Pizza Oven SHORTED PROBE: Constant Reading
SHORTED PROBE means the control sees a constant temperature value instead of the normal cycling chamber temperature. Check the gas valve and the gas hose connections, since the message can appear when no gas reaches the oven.
High: the oven cannot hold temperature and may have no gas.
- Code
- SHORTED PROBE
- Maker
- Lincoln
- Equipment
- Pizza ovens
- Applies to
- Impinger II Advantage Digital 1100 and Impinger I 1400 Digital Advantage
What does Lincoln SHORTED PROBE mean?
In normal operation the chamber temperature rises and falls as the burner cycles on and off, so the control sees a moving signal. If the value stays constant, the control concludes the probe is shorted and displays SHORTED PROBE. The operating manual adds a caution: it can appear when no gas reaches the oven. If no temperature fluctuation is seen within 5 minutes, the message appears. That means the temperature is not changing because the burner is not lighting, not because the probe is bad. The manual's action is to check the gas valve and the gas hose connections. The listed causes are the lack of fluctuation for 5 minutes and no gas supply to the oven. On a gas oven, the first check is therefore whether gas is on, before a probe is replaced. A true probe short is also possible, so a technician measures the probe.
Affected models and control systems
Impinger II Model Series 1100 Digital Advantage conveyor ovens from Lincoln (1116, 1130, 1132, 1133 and similar). The gas supply cause applies to the gas models.
Code numbers and their meaning can change between control generations. We match the full model and control before acting on a code.
What you may notice
- SHORTED PROBE on the display
- Oven not heating or chamber temperature stuck
- Burner not lighting
Possible causes
Listed in Lincoln's documentation
- No temperature fluctuation for 5 minutes
- No gas supply to the oven
Other likely causes — what usually sits behind SHORTED PROBE on this control. A technician confirms which one it is before any part is replaced.
- A gas shutoff valve closed after cleaning or a service call
- A flexible gas hose kinked or loose after the oven was moved
Safe checks before calling for service
- Check that the gas valve to the oven is open.
- Look at the gas hose to see that it is connected and not kinked.
- Do not use matches or lighters; if you smell gas, leave and call your gas provider.
- Turn the oven off and on once, and tell the technician whether the burner lit.
How a technician diagnoses SHORTED PROBE
- Read the display and ask whether the burner lights.
- Verify gas supply pressure at the oven.
- Check the gas valve operation and hose connections.
- Measure the thermocouple at the control for a real short.
- Replace the thermocouple or control only if the gas side checks out.
- Gas valves, hoses and burners need leak-tested repairs.
- Controls and igniters carry line voltage.
- A real shorted probe must be told apart from a gas problem with a meter and pressure gauge.
How SHORTED PROBE differs from similar codes
OPEN PROBE reports no signal at all; SHORTED PROBE reports a constant value, often because the burner is not cycling.
Technical reference
- Maker documentation
- Lincoln owner support
- Edition
- 1100opsman REV 4/3/07, Part Number 2810075
- Models / control
- Impinger II Advantage Digital 1100 and Impinger I 1400 Digital Advantage
- Section
- Operating Instructions, Diagnostic Messages, p. 21
- Checked
- October 2026
We use the maker's document to read the code and do not reproduce it. Always confirm the complete model and control before applying these steps.
Related Lincoln pizza oven error codes
Is SHORTED PROBE always a bad probe?
No. It can appear when no gas reaches the oven.
How long before the message appears?
If no temperature fluctuation is seen within 5 minutes.
What should I check first?
The gas valve and gas hose connections.
Need help with Lincoln SHORTED PROBE?
A technician confirms the cause on site and gives you the price in writing before any work starts.