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ErrorLib — Industrial Fault Code Library

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MAINS (No Power)

No Power to Phone Board

Kone · Electric Traction Elevators

What does MAINS (No Power) mean?

The phone board is completely without power, indicated by the MAINS LED being OFF (Green) and the system being non-operational. This signifies a complete power failure, meaning neither main power nor backup battery power is available. The system cannot function in this state.

Common Causes

  • Both the main power supply is disconnected or off, and the backup battery is completely discharged or disconnected.
  • A critical internal fault on the phone board is preventing it from powering up, even with valid power inputs.
  • Multiple power supply issues, such as a tripped main breaker combined with a failed or deeply discharged battery.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Verify the main power supply cable is connected and providing the correct voltage at the phone board's input terminals.

  2. 2

    Inspect the backup battery connections for proper installation and measure its voltage; recharge or replace if necessary.

  3. 3

    Check all power-related fuses on the phone board and its power input circuitry for continuity, replacing any blown fuses.

Browse all codes in this manual (13)
Verified technical data. Last updated: April 2026

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Source: Kone Electric Traction Elevators
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