Frymaster HOT Error Code
Frypot temperature above 410°F
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
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.
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.
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.
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.
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.
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Other Frymaster Error Codes
Temperature probe failure - RTD out of range
High limit 1 exceeded - vat temp above 410°F
High limit 2 exceeded - high limit switch opened
High limit problem - vat temp above 460°F, disconnect power immediately
Failed temperature probe or controller
Heating problem / ignition lockout
Heating failure. The heating-control latch circuit failed, or the heat contactor failed to latch.
Heating failure - blower. The air pressure switch(es) failed to close.
Heating failure - pressure switch. The air pressure switch has failed closed. Call service.
Heating failure. The fryer failed to ignite and has locked out the ignition module.
Top-off probe failure. The ATO (auto top-off) RTD reading is out of range. Call service.
Drain valve not open. The drain valve was commanded open but confirmation is missing; filtration and top-off disabled. Call service.
Sources: www.partstown.com, fm-xweb.frymaster.com
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