This article explains the core electrical system used in AVA Easy series pressure washers (models P30 to P57).
These machines are equipped with a universal motor and a double-insulated (Class II) system — there is no ground wire, and safety is entirely dependent on insulation and design.
Circuit Overview
The electrical system includes the following components:
- Power cord
- Main switch (ON/OFF)
- Capacitor (startup assist)
- Universal motor (AC/DC type)
- Micro switch (part of the Total Stop System – TSS)
All AVA Easy models stop the motor when the trigger is released (TSS). The micro switch is activated by water pressure via a mechanical plunger, breaking the circuit to the motor.
General Safety Tips
- Always disconnect the power cord before opening or inspecting any electrical components.
- Use insulated tools and wear gloves when working near wiring.
- If a part is burned, melted, discoloured, or brittle — replace it immediately.
- Only use AVA-approved replacement parts.
Read our article regarding Safety
Troubleshooting – How to Test Components
Always discharge the capacitor before testing.
See our article regarding capacitor here.
Replacement Advice
In many cases, electrical faults happen in combination — for example, a failing capacitor may stress the switch. That’s why we recommend:
Replace the complete switch box assembly when:
- The machine won’t start.
- Motor doesn’t stop with the gun.
- The micro or main switch shows signs of wear.
- The AVA Switch Box Kit includes:.
- ON/OFF switch.
- Micro switch.
- Capacitor.
These parts are preassembled and tested.
Tip
If the machine intermittently cuts out or hums on startup, check both the capacitor and the microswitch. Minor resistance or delayed activation often indicates early failure.
If you're in doubt, replace the entire unit to prevent future damage.
