The Wacker Neuson ET20 is a compact excavator designed for tight spaces, with a clear instrument cluster that uses intuitive warning lights to keep you informed. Understanding these indicators is essential for safe operation and machine longevity.
Wacker Neuson ET20 Warning Light Symbols
| Symbol | Name | Color | What it means | What to do |
|---|---|---|---|---|
| Master Warning (Stop) | RED | This red stop light illuminates when a critical fault is detected, such as low oil pressure or high coolant temperature, requiring immediate engine shutdown on the ET20. | Stop the engine immediately and consult the operator's manual for the specific fault code. | |
| Master Caution | AMBER | The amber caution light appears for non-critical issues like a clogged air filter or high hydraulic oil temperature on the ET20. | Reduce load and check the warning display for details; schedule service soon. | |
| Check Engine (MIL) | AMBER | This light indicates an engine management issue, such as a sensor fault or emission system problem, on the ET20's Yanmar engine. | Have the engine diagnostics checked by a Wacker Neuson dealer. | |
| Engine Oil Pressure | RED | Low oil pressure detected in the ET20's engine, risking severe internal damage if operation continues. | Stop the engine immediately and check oil level; do not restart until resolved. | |
| Battery / Charging | RED | The charging system is malfunctioning on the ET20, possibly a failed alternator or loose belt. | Check alternator belt tension and battery connections; replace alternator if needed. | |
| Coolant Temperature | RED | Engine coolant temperature has exceeded safe limits on the ET20, often due to low coolant or a blocked radiator. | Stop the engine, let it cool, then check coolant level and clean debris from radiator fins. | |
| Hydraulic Oil Temperature | AMBER | Hydraulic oil temperature is high on the ET20, usually from heavy use or low oil level. | Reduce digging load and allow hydraulics to cool; check hydraulic oil level. | |
| Glow Plug / Preheat | AMBER | The glow plug indicator stays on longer than usual on the ET20, indicating a preheat system fault. | Have the glow plugs and relay tested before cold weather operation. | |
| Low Fuel | AMBER | Fuel level is low in the ET20's tank, risking air entrainment in the fuel system. | Refuel as soon as possible to avoid bleeding the fuel system. | |
| Fasten Seat Belt | RED | The operator's seat belt is not fastened on the ET20; the machine may have an interlock that prevents travel. | Fasten your seat belt immediately before operating. | |
| Air Filter Restriction | AMBER | The engine air filter is clogged on the ET20, reducing power and increasing fuel consumption. | Replace or clean the air filter element. | |
| Service Due | AMBER | The ET20's hour meter indicates that scheduled maintenance is due (e.g., oil change or filter replacement). | Perform the required service per the maintenance schedule. | |
| Work Lights | GREEN | The work lights are switched on, providing illumination for the ET20's digging area. | Turn off when not needed to preserve battery. | |
| Beacon / Rotating Light | GREEN | The rotating beacon is active on the ET20, indicating the machine is in operation for safety. | Keep beacon on whenever the machine is moving or digging. | |
| Swing / Slew Lock | AMBER | The swing lock is engaged on the ET20, preventing the upper structure from rotating. | Release the swing lock before slewing the excavator. |
15 symbols shown. Icons follow ISO 2575 dashboard standards; exact graphics vary by model year.
Most Important Warning Lights
Engine Overheat
Common causes
- Low coolant level
- Blocked radiator
- Faulty thermostat
What to do
Stop the ET20 immediately. Allow engine to cool, then check coolant level and clean radiator fins. If problem persists, replace thermostat.
Low Oil Pressure
Common causes
- Low oil level
- Oil pump failure
- Clogged oil filter
What to do
Shut down the ET20 engine. Check oil level and top up if low. If light remains, have oil pressure tested and filter replaced.
Hydraulic System Overheating
Common causes
- Low hydraulic oil
- Excessive load
- Contaminated oil
What to do
Reduce the digging load on the ET20 and allow the system to cool. Check hydraulic oil level and condition; replace if necessary.
Charging System Failure
Common causes
- Broken alternator belt
- Failed alternator
- Loose battery connections
What to do
Check alternator belt tension and battery terminal connections. If belt is intact, have alternator tested and replaced on the ET20.
Frequently Asked Questions
What should I do if the red stop light comes on while digging?
Immediately stop the ET20 engine and refer to the diagnostic code. Common causes include low oil pressure or high coolant temperature—check levels and inspect for leaks before restarting.
How often should I service the ET20's hydraulic oil?
Wacker Neuson recommends changing the hydraulic oil every 1,000 hours or annually, whichever comes first. Also, change the hydraulic filter at each oil change.
Why is my preheat light staying on longer than usual?
A prolonged glow plug indicator on the ET20 suggests a faulty glow plug or relay. Have the system tested, especially before cold weather operation to ensure reliable starting.
Can I operate the ET20 with the swing lock engaged?
No, the swing lock must be disengaged to allow the upper structure to rotate. Operating with it engaged can damage the swing drive—always release it before slewing.
What does it mean when the air filter light comes on?
The air filter restriction indicator on the ET20 warns that the filter is clogged, reducing engine performance. Replace the filter element promptly to maintain fuel efficiency.
How do I reset the service hour light after maintenance?
After performing the scheduled service on the ET20, the hour meter light can be reset using the menu button on the cluster—refer to the operator's manual for the exact procedure.