---
title: My system won't power on.
description: There are a few things to check prior to contacting our service department.
---

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1. [Raytech USA Help Center](https://support.raytechusa.com/migration?hsLang=en)
2. [Single Phase & Three Phase Ratiometers](https://support.raytechusa.com/migration/single-phase-three-phase-ratiometers?hsLang=en)
3. [General](https://support.raytechusa.com/migration/single-phase-three-phase-ratiometers?hsLang=en#general)

# My system won't power on.

## There are a few things to check prior to contacting our service department.

Please verify the following:

1. Ensure that the system is connected to a 120V AC power source (if it is not battery operated).

2. Check the fuse (if applicable) located near the power switch.

3. If you are using an extension cord, disconnect it and try powering the system directly.

 

- [Frequently Asked Questions](https://support.raytechusa.com/migration/frequently-asked-questions?hsLang=en)
- [Capacitance / Dissipation Factor / Power Factor](https://support.raytechusa.com/migration/capacitance-dissipation-factor-power-factor?hsLang=en)
- [Low Resistance](https://support.raytechusa.com/migration/low-resistance?hsLang=en#main-content)
  
  
  
  
  
    - [Micro Centurion II (MC2)](https://support.raytechusa.com/migration/low-resistance?hsLang=en#micro-centurion-ii-mc2)
    - [Kelvin Spike Probes](https://support.raytechusa.com/migration/low-resistance?hsLang=en#kelvin-spike-probes)
- [mini-ATOS](https://support.raytechusa.com/migration/mini-atos?hsLang=en)
- [Single Phase & Three Phase Ratiometers](https://support.raytechusa.com/migration/single-phase-three-phase-ratiometers?hsLang=en#main-content)
  
  
  
  
  
    - [TR-Mark III 250V](https://support.raytechusa.com/migration/single-phase-three-phase-ratiometers?hsLang=en#tr-mark-iii-250v)
    - [TR-1](https://support.raytechusa.com/migration/single-phase-three-phase-ratiometers?hsLang=en#tr-1)
    - [General](https://support.raytechusa.com/migration/single-phase-three-phase-ratiometers?hsLang=en#general)
- [Winding Resistance](https://support.raytechusa.com/migration/winding-resistance?hsLang=en)

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