Error code · Blendtec · Blenders

Blendtec Commercial Blender Error Code Zero Crossing: Not Detected

Error: Zero crossing not detected on a Blendtec commercial blender means the control is not seeing the AC line zero-crossing signal it uses for motor timing. The manual lists it under Reset Errors: press the cancel button or unplug the blender and plug it back in, and contact your Blendtec service agent if it does not clear.

Medium · inspection needed

Medium: the control cannot time the motor, so the blender may not run until the cause is found.

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Code: Error: Zero crossing not detected
Maker: Blendtec
Equipment: Blenders
Applies to: Blendtec Stealth 875/885 (and 895 in contents), Connoisseur 825, Chef 775, EZ 600, Chef 600

What does Blendtec error: zero crossing not detected mean?

Household and commercial power alternates, and the point where the voltage passes through zero is called the zero crossing. The Blendtec control uses that signal as a timing reference for driving the motor. If the control does not see it, the display shows Error: Zero crossing not detected, because it cannot time the motor properly. The manual lists the message with the other Reset Errors for the Stealth 875/885 and Connoisseur 825. The action is to press the cancel button or cycle power by unplugging the blender and plugging it back in, and, if the error does not clear, to contact your Blendtec service agent. No individual causes are listed. A noisy or unstable supply, a poor outlet connection, or a failing detection circuit on the board could explain it, but those are our likely causes. The display reads exactly Error: Zero crossing not detected.

Affected models and control systems

This message is listed in the Blendtec Commercial Series manual, which covers the Stealth 875/885 (and 895 in its contents), Connoisseur 825, Chef 775, EZ 600 and Chef 600. The reset instruction below is given under Reset Errors for the Stealth 875/885 and Connoisseur 825.

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

Error: Zero crossing not detected on the display
Blender not starting or stopping at start
Display flickering or the blender behaving oddly on a shared outlet

Possible causes

Likely causes — what usually sits behind error: zero crossing not detected on this control. A technician confirms which one it is before any part is replaced.

Unstable or noisy power from the outlet or a shared circuit
Loose cord, worn plug or poor outlet contact interrupting the supply
Zero-crossing detection circuit on the control board failing

Safe checks before calling for service

✓ What an operator can do

Press the cancel button, or unplug the blender and plug it back in, as the manual says.
Plug it into a different outlet that is not shared with large equipment.
Check that the plug is fully seated and the cord is not damaged.
If it does not clear, contact your Blendtec service agent and note which outlet you used, for the service call.

How a technician diagnoses error: zero crossing not detected

Read the error and confirm it is the zero-crossing message.
Measure supply voltage and look for dips or noise at the outlet.
Inspect the cord, plug and internal connections.
Check the detection circuit on the control board.
Replace the board only after the supply and wiring check out.

! Leave this to a technician

Supply checks mean measuring live voltage at outlets.
Board-level testing needs the base opened and a meter.
A damaged cord or plug is a shock risk and should be replaced properly.

Technical reference

Document: Commercial Series Owner's Manual and User Guide (Blendtec)
Edition: All Models, US ENG, CA FRE, MX SPA, Aug 2017 (copyright 2015 Blendtec, Inc.)
Models / control: Blendtec Stealth 875/885 (and 895 in contents), Connoisseur 825, Chef 775, EZ 600, Chef 600
Section: Section 6 Troubleshooting - 6.2 Error Messages on Display, printed pp. 47-49 (PDF pp. 49-51)
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.

→Same maker

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Error: Zero crossing not detectedQuestions about Blendtec error: zero crossing not detected

Is this a power problem?

Often it is the supply, but the manual lists no causes. Try another outlet first.

Can I keep using the blender?

If a power cycle clears the error, yes. If it returns, contact your Blendtec service agent.

Why does the blender need a zero crossing signal?

The control uses it to time the motor drive. The manual does not go into detail.

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