Blodgett PROBE Error Code

What does Blodgett PROBE mean?

PROBE (also displayed as PROBE OPEN or PROBE SHORT on some Blodgett controllers) means the temperature sensor circuit has failed. The controller cannot read a valid oven temperature, so it disables heat demand and sounds an alarm to prevent uncontrolled overheating. PROBE OPEN indicates the probe circuit is broken (open circuit); PROBE SHORT indicates the probe or its wiring has shorted. Both conditions require corrective action before the oven can cook safely.

Symptoms

• PROBE, PROBE OPEN, or PROBE SHORT appears on the display with an audible alarm.
• The oven will not heat or halts an active cook cycle.
• Temperature display reads an extreme value (–40 °F or 999 °F) or shows dashes instead of a temperature.
• Alarm resets on power cycle but returns immediately if the probe or wiring fault persists.

Common causes

• Failed temperature probe — open element (PROBE OPEN) or internal short (PROBE SHORT) are the most frequent causes.
• Broken, frayed, or pinched probe lead wire causing an open or short circuit.
• Corroded or loose connector at the probe plug-in or at the control board terminal.
• Control board input circuit failed, preventing the controller from reading a valid probe signal.
• Probe pulled out of its mounting bracket, exposing it to a temperature extreme that damaged the element.

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Diagnostic steps

1. Power cycle to check for a transient fault

   Turn the oven off, wait 30 seconds, and power back on. If PROBE clears and the displayed temperature is plausible, the fault was transient. Monitor for recurrence; a returning PROBE code confirms a hardware fault.

2. Inspect the probe connector and lead wire

   With power off and locked out, unplug the probe connector at the control board. Inspect both the connector body and the probe lead wire for corrosion, burnt insulation, or obvious physical damage. Clean corroded pins with electrical contact cleaner and reconnect firmly.

3. Measure probe resistance

   With the probe disconnected and the oven at room temperature, measure resistance across the probe leads with a digital multimeter. Blodgett specifies resistance values by probe type in the service manual (typically 1,000–2,000 ohms at 70 °F for a standard RTD; consult the Probe Ohms Chart at blodgett.com/hv-100e-service/ for your specific model). An infinite reading confirms PROBE OPEN; near-zero confirms PROBE SHORT.

4. Verify probe seating

   Confirm the probe is fully seated in its mounting bracket inside the oven cavity. A dislodged probe exposed to direct heat will read erratically or fail. Reseat and secure the probe before testing resistance again.

5. Replace the probe if out of specification

   If resistance is outside the specified range, replace the probe with the correct Blodgett part number for your model. Use the probe diagnostic kit if available (Part 54379 for HV-100 series). After replacement, power on the oven and verify the temperature display reads a reasonable ambient value before running a cook cycle.

6. Test the control board input if probe tests good

   If the probe measures within specification but PROBE persists, the control board's probe input circuit has failed. Contact an authorized Blodgett service technician — board-level diagnosis requires the factory wiring diagram and a known-good probe for substitution testing.

When to call a professional

Contact an authorized Blodgett service technician if PROBE returns after installing a new probe, if the probe tests within specification but the fault persists, or if resistance testing is outside the technician's skill level. A failed control board input or incorrectly specified replacement probe can result in the oven running at an uncontrolled temperature, creating a fire and product safety hazard.