---
title: "Wiring \u0026 Electrical"
description: "Solve TapHome electrical wiring problems, voltage issues, and installation questions. Guides for proper wiring of smart home modules and devices."
url: "https://taphome.com/en/troubleshooting/wiring/"
language: en
lastmod: 2025-01-15
generator: hugo
---

# Wiring & Electrical

Electrical wiring issues, voltage problems, and installation questions

## articles

- [TapHome bus: measure Bus A and Bus B](https://taphome.com/en/troubleshooting/wiring/taphome-bus-voltage-a-b/) — Modules on the TapHome bus drop out, the bus analyzer shows errors or push buttons react late. A multimeter check of Bus A and Bus B against GND at the Core and at the modules shows a loose terminal, an unconnected wire or a faulty module.
- [DALI lights switch on by themselves](https://taphome.com/en/troubleshooting/wiring/dali-lights-switch-on-by-themselves/) — DALI lights behind a DALI gateway switch on at minimum or change brightness without any command, usually the same few lights each time. The bus is disturbed for a moment — by the gateway, a short on a branch or a voltage drop.
- [Modbus RTU: device drops out, no common GND](https://taphome.com/en/troubleshooting/wiring/modbus-rtu-missing-common-ground/) — A Modbus RTU device with its own power supply, such as a hybrid inverter, heat pump or heat recovery unit, goes into error for a few tens of seconds and its values have gaps, because only A and B are wired and its ground floats against the ground of the Core.
- [Push button: every press is a long press](https://taphome.com/en/troubleshooting/wiring/push-button-input-active-at-rest/) — A push button on a universal input reports long presses, series of short presses and the error "pressed for more than 1 minute" when its input is active while the button is not pressed, typically with a normally closed button or wiring.