---
title: Sapiens - How to solve error message “A61 High level input alarm“?
description: A61 High level input alarm worn about a problem on max water level probe. As consequence unit deactivate the boiler. This message requires the intervention of an authorized technician; causes of the f
---

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# Sapiens - How to solve error message “A61 High level input alarm“?

A61 High level input alarm worn about a problem on max water level probe.  
As consequence unit deactivate the boiler.

**This message requires the intervention of an authorized technician; causes of the fault must be investigated as per prescriptions.**

### Description

Unit detect water on max level electrode L3 but do not detect it on min level electrode L2.

### Reset

The error will automatically reset with the first successfull boiler flush.

### Checks

Perform following checks:

- Check the correct connection of the level electrodes:  
    - Emptying L1 
    - Minimum L2 
    - Max L3
- Check for no limescale on probes.
- Check boiler expansion card connections.

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