Hamilton Beach Commercial Blender Error 29, 30, 42, 100, 103: EEPROM
Errors 29, 30, 42, 100 and 103 on a Hamilton Beach Commercial HBH750, HBH755 or HBH850 blender all mean a communication problem between the microcontroller and its settings memory. Unplug the blender, push the plug back in firmly, and make sure the jar is seated. If the number returns, stop restarting it and call us.
Medium: programs may not run, but the cause sits in the control boards and not in a safety circuit.
- Code
- Error # 29, 30, 42, 100, 103
- Equipment
- Blenders
- Applies to
- HBH750 / HBH755 / HBH850 display
What does Hamilton Beach Commercial error # 29 mean?
The blender's settings and program data are stored in a small memory chip called an EEPROM. The microcontroller reads that chip at power-up and when it saves a change. If the two cannot communicate, the control stops and shows the error number. Five numbers, 29, 30, 42, 100 and 103, point to the same type of communication problem, so the number alone does not name the part. The display shows the error and the blender may not run programs. The maker's data sheet places these on the control boards rather than the motor, and the repair we expect is on the display board. A poor connector between boards or an unstable power supply can interrupt that conversation as well, which is why the plug and wiring are checked first. The display text reads Error # 29, 30, 42, 100, 103.
Affected models and control systems
Hamilton Beach Commercial HBH750, HBH755 and HBH850 blenders with the display board. Other numbers on the same models mean different things.
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
- An error number from the list on the display
- Programs will not run
- Blender unresponsive after power-up
Possible causes
Listed in Hamilton Beach Commercial's documentation
- Display board and its memory chip
- Wiring and connectors between the boards
- Power quality and plug condition
- Main control board, once the display board is cleared
Other likely causes — what usually sits behind error # 29 on this control. A technician confirms which one it is before any part is replaced.
- A power strip or extension cord with a loose contact that drops power during start-up
- A connector between the boards loosened by vibration during heavy use
Safe checks before calling for service
- Disconnect the blender from the outlet, then push the plug back in firmly.
- Make sure the jar is seated correctly on the base.
- Note which error number is shown.
- Do not keep restarting the blender if the number returns.
- Call us and tell us the exact number and whether it appears at power-up or mid-cycle.
How a technician diagnoses error # 29
- Record the exact error number and when it appears.
- Check the power cord, outlet and any extension for stable voltage.
- Inspect the connectors between the display board and main control board.
- Test with a known good display board where one is available.
- Replace the display board if the error follows it.
- Check the main control board only after the display board is cleared.
- Board work means opening the base, where line voltage and capacitors are present.
- Because five numbers share one meaning, the board has to be confirmed by testing, not by the number alone.
- Replacing a memory-related board takes the right part for the model and a bench check afterward.
Technical reference
- Document
- Hamilton Beach Technical Data Sheet GB34 HBH750/HBH755 (Doc 520008100 Rev B, 2024) and HBH850 (Doc 520004200)
- Edition
- Document # 520008100, Rev: B, revision date 05-Sep-2024 (Revised added Error 51 info); form ENG-FRM-RIC-4.32 Rev. E
- Models / control
- HBH750 / HBH755 / HBH850 display
- Section
- Trouble Shooting Guide, pp. 1-2 (error # 29/30/42/100/103 at end of p. 1 into p. 2; error # 60/62 and error # 51 on p. 2; Speed Sensor Failure/Error on p. 1)
- 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 Hamilton Beach Commercial blender error codes
Do these errors mean a bad motor?
No. The data sheet places them on the control boards.
Will unplugging clear the error?
It can for a brief loss of communication, but a repeat points to the board.
Are 29 and 100 different problems?
They share the same meaning, so the repair is the same type.
Need help with Hamilton Beach Commercial error # 29?
A technician confirms the cause on site and gives you the price in writing before any work starts.