Frymaster E16

What does Frymaster E16 mean?

The controller has detected that vat oil temperature has exceeded 410°F (210°C), triggering the first software high-limit threshold. This event means the fryer's normal temperature regulation has failed to prevent overheating. The oil in the vat is likely degraded and must be discarded. The fryer will not resume heating until the fault is cleared and the underlying cause is resolved.

Symptoms

• Display shows E16 and all heating stops immediately.
• Vat oil temperature is at or above 410°F when error occurs.
• Oil may be discolored, smoking, or exhibit a burnt odor.
• Fryer does not restart after cooling without manual fault reset.

Common causes

• Faulty latch relay on the SIB board allowing continuous heat delivery past setpoint.
• Failed heat relay on the SIB board not opening when commanded.
• Inaccurate RTD probe reading causing the controller to underestimate vat temperature (see E13).
• Oil Information Board (OIB) sensor contamination producing incorrect temperature feedback.
• Controller board failure causing loss of temperature regulation.

Diagnostic steps

1. 01

   Turn off the fryer immediately

   Switch the fryer to the OFF position. Do not attempt to drain or filter oil — the temperature is above safe handling range.

2. 02

   Verify the temperature readout accuracy

   After cooling to a measurable range, compare the controller display against a calibrated thermometer. If the display is significantly incorrect, proceed to probe circuit troubleshooting per event code E13 procedure.

3. 03

   Inspect and clean the OIB sensor

   Locate the Oil Information Board sensor inside the frypot. Clean any carbon or oil residue from the sensor surface with a soft cloth. Contamination can cause false low readings that allow the fryer to overheat.

4. 04

   Test the latch and heat relays on the SIB board

   With power applied and the fryer in standby, check LED indicators 1 and 3 on the SIB board (refer to section 1.8 of the BIGLA30-T service manual). A relay stuck in the energized state will keep burners firing regardless of controller command.

5. 05

   Replace the SIB board if relays are faulty

   If either the latch or heat relay fails to open when commanded, replace the SIB board. Clear the E16 error, restore power, and verify normal temperature cycling before returning the fryer to service.

When to call a professional

Escalate to a licensed technician if the latch or heat relay on the SIB board is confirmed faulty, or if the controller fails to regulate temperature after replacing a confirmed defective probe. Relay replacement and SIB board work involve live 24 VAC circuits and requires proper lockout/tagout procedures. Discard and replace oil after any E16 event.