| Parameter Read-Write Abnormity | Damage of EEPROM Chip |
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ERR26 – Parameter Read/Write Abnormality
What this means
ERR26 indicates that the VFD has detected a failure when reading from or writing to its internal memory (EEPROM).
In simple terms, the VFD cannot reliably store or retrieve configuration parameters. This memory is what allows the VFD to remember settings when powered off.
This is a hardware-level fault, not a configuration or usage issue.
Why This Happens
The EEPROM chip inside the VFD is responsible for:
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Saving parameters
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Retaining configuration data
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Storing system settings across power cycles
ERR26 is triggered when the VFD detects that this memory is:
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Corrupted
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Unreadable
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Unable to store new data
Most Common Causes We See
1. EEPROM memory failure (most common)
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Internal memory degradation
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Manufacturing defect
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End-of-life memory wear
EEPROM chips have finite write cycles, though failure is uncommon.
2. Severe electrical events
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Power surges
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Brownouts
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Lightning strikes
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Improper power disconnects during parameter writes
These can corrupt internal memory.
3. Internal control board failure
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Damage to the main control board
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Failed memory interface circuitry
This typically accompanies other unstable behavior.
What to Check First
Step 1: Power cycle the VFD
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Turn off and unplug the VFD
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Wait several minutes
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Power back on and observe
If ERR26 immediately reappears, the issue is persistent.
Step 2: Attempt a parameter reset (if accessible)
If the VFD allows:
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Perform a parameter initialization or factory reset
If the reset fails or settings will not save, this confirms a memory issue.
What ERR26 Is Not
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Not a spindle motor fault
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Not a wiring issue
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Not a cutting load problem
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Not a controller or communication error
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Not EMI related
ERR26 is not something that can be fixed through tuning or configuration.
Required Action
ERR26 indicates hardware failure of the VFD’s internal memory.
At this point:
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Continued operation is unreliable
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Parameters may not save correctly
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Safe operation cannot be guaranteed
The correct resolution is replacement of the VFD control board or the VFD itself.
When to Contact Support
If you encounter ERR26:
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Stop using the VFD
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Contact [email protected]
We can help:
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Confirm the diagnosis
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Determine warranty status
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Advise on replacement options
Summary
ERR26 means the VFD has detected a failure of its internal EEPROM memory.
Most common causes:
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Internal memory damage
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Electrical events
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Control board failure
This is a hardware fault and cannot be resolved through configuration changes.
Replacement of the control electronics is required.
