POS Terminals Error Code
Systems & Devices
POS Terminals
TAMPER | Tamper detected
Industry
Systems & Devices
Canonical
/systems/pos-terminals/error-codes/tamper-detected/
Last Updated
Feb 27, 2026
Summary
The terminal detected a tamper condition and disabled sensitive functions to protect encryption keys.
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What This Code Means
“Tamper” messages on payment terminals indicate the device’s tamper-detection mechanisms triggered. Terminals are designed to protect cardholder data and encryption keys; when tamper is detected, the terminal may lock down and require certified service or key reload procedures.
Where Users Usually See This Code
- Terminal boot screens
- After drops, impacts, or casing/connector stress
- After extreme temperature/humidity exposure
Why This Code Appears
- Physical tamper sensor triggered
- Battery-backed security module state issue
- Hardware fault interpreted as tamper
What Typically Happens Next
- The terminal disables payment acceptance
- Replacement or certified servicing is required
What This Code Is Not
- It is not a customer card decline
- It is not fixable by reinstalling an app
Troubleshooting Checklist
- □ Do not attempt to open the terminal casing
- □ Remove the terminal from service and contact your processor/vendor
- □ Follow certified replacement/service procedures to maintain compliance
Notes And Edge Cases
Tamper handling is compliance-sensitive; use official support channels rather than guesswork.
Related Codes
8 links
- KEYS NOT LOADED CodeEncryption keys missing
- DUPLICATE CodeDuplicate transaction
- CALL ISSUER CodeIssuer contact required
- DECLINED CodeIssuer declined
- ICC READ CodeChip read error
- MAC ERROR CodeMessage authentication error
- NO CONNECTION CodeHost connection unavailable
- SWIPE READ CodeMagstripe read error
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