Frymaster 3000 Fryer Error Code E28: High Temp Alarm
HIGH TEMP ALARM (E28) on a Frymaster fryer with the 3000 or 3010 controller means the oil temperature has risen 40F (22.2C) above setpoint. Turn the fryer off with the power button and let it cool. Call service if it continues.
High: the oil is 40F above setpoint, which can lead to a high-limit shutdown and is a burn and fire risk.
What does Frymaster error code E28 mean?
The controller compares the oil temperature with the setpoint all the time. If the oil climbs 40F (22.2C) above setpoint, it logs E28 and shows HIGH TEMP ALARM. If the temperature keeps rising, the high limit shuts the burner off at 425F (218C), or 395F (202C) on CE units. The alarm is the earlier warning, and the high limit is the final stop. The manual's action is to turn the fryer off with the power button and let it cool, and call service if the alarm continues. The cause is that heat is not being shut off when it should, such as a probe reading that is lower than the real oil temperature, a gas valve that stays open, or a control output that stays on. Do not try to cook or filter hot oil during this alarm, because oil that hot is a serious burn and fire hazard.
Affected models and control systems
3000 and 3010 controller fryers, as listed in the error log table in section 2.2.4.
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
- HIGH TEMP ALARM on the controller
- Alarm sounding
- Oil temperature far above setpoint
- Smoking oil or an oil smell
Possible causes
Likely causes — what usually sits behind error code E28 on this control. A technician confirms which one it is before any part is replaced.
- Oil temperature has risen 40F (22.2C) above setpoint
- A temperature probe that reads lower than the real oil temperature
- A gas valve or heating control that stays on
- A controller output that keeps the burner energized
Safe checks before calling for service
- Turn the fryer off with the power button.
- Keep people away from the vat and let the oil cool without moving it.
- Do not restart the fryer to test it.
- Tell the technician when it happened and how high the oil seemed to be.
How a technician diagnoses error code E28
- Confirm the alarm and read the error log.
- Check the oil temperature with a calibrated probe once safe.
- Check the temperature probe against the real oil.
- Check the gas valve and controller output for sticking on.
- Test the high limit, and replace the part that fails.
- Oil near 425F is a fire and burn hazard.
- Gas valves and burner controls need a gas-trained technician.
- The high limit and its tests are safety checks done with power locked out.
How error code E28 differs from similar codes
E28 is the early warning at 40F above setpoint; E05 HOT HI 1 is the high limit going past 410F (395F on CE).
Technical reference
- Document
- 3000/3010 Controller Operation Manual, Software Versions 3,4,5,6,7
- Maker documentation
- Frymaster owner support
- Edition
- 8/2017, 819-6985
- Models / control
- 3000/3010 controller fryers
- Section
- 2.2.4 Error Log Codes, p. 2-5 (and 2.2.1 Hi temp row)
- 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 Frymaster fryer error codes
When does the high limit shut the burner off?
At 425F (218C), or 395F (202C) on CE units, if the oil keeps rising.
Can I keep cooking?
No. Turn the fryer off and let the oil cool.
What if it comes back?
The manual says to call service if the alarm continues.
Need help with Frymaster error code E28?
A technician confirms the cause on site and gives you the price in writing before any work starts.