Frymaster HOT Error Code

What does Frymaster HOT mean?

The controller has detected frypot oil temperature above 410°F — the same threshold as E16 but displayed on older or simpler Frymaster controller models. The fryer stops heating immediately. At this temperature, the cooking oil is degraded and unsafe; it must be discarded after the unit cools. The HOT display means temperature regulation has failed and a hardware or control circuit fault is preventing normal shutoff.

Symptoms

• Display shows HOT and the fryer ceases all heating.
• Oil is at or above 410°F and may be smoking or discolored.
• Fryer will not accept a heat command until the error is cleared.
• Oil has a burnt odor indicating thermal degradation.

Common causes

• Latch or heat relay stuck closed on the SIB board, bypassing the temperature setpoint shutoff.
• Failed or inaccurate RTD probe causing the controller to read lower than actual temperature.
• SIB board malfunction causing loss of temperature regulation.
• Oil Information Board (OIB) sensor fouled with carbon residue.

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Diagnostic steps

1. Turn off the fryer immediately

   Switch to OFF. Do not handle, drain, or filter the oil — at 410°F+ it will cause severe burns. Keep personnel away from the frypot.

2. Allow the fryer to cool, then verify probe accuracy

   Once cooled to a measurable range, compare the controller temperature display against a calibrated IR thermometer or thermometer probe. A large discrepancy (more than 10°F) points to a probe or probe-circuit fault.

3. Clean the OIB sensor

   With the fryer cooled and drained, inspect the OIB sensor in the frypot. Clean carbon buildup from the sensor surface using a soft cloth. Reinstall and test the temperature cycle.

4. Inspect the SIB board heat and latch relays

   With the fryer in standby, observe LED indicators on the SIB board. LEDs 1 and 3 indicate the heat and latch relay states. A relay that remains energized when no heat command is issued is stuck closed and the SIB board must be replaced.

5. Discard oil and return to service

   After confirming the fault is resolved, drain and discard all oil from the frypot. Clean the frypot thoroughly before refilling with fresh oil. Cycle the fryer through a full heat cycle and verify normal temperature regulation before resuming food production.

When to call a professional

Call Frymaster service at 1-800-551-8633 if the HOT error recurs after cleaning the OIB sensor, or if the SIB board relays are found faulty. Operating a fryer with an unresolved overtemperature fault is a direct fire risk. A licensed technician must diagnose and repair relay or board faults before commercial use resumes.