E5
MUSTART
Overtemperature Protection (Internal Charger Overheat)
Display shows “E5” and charging stops or will not start; often associated with very hot weather or long high‑current sessions.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Blocked ventilation around charger, direct sun exposure on unit, failing internal temperature sensor, degraded internal power relay or contactor generating excess heat
How to Fix / Troubleshooting
Safety warning: Overheating can damage internal components. Do not cover the charger or operate it in confined spaces.
- Power down and cool: Unplug the charger or switch off the breaker. Allow the unit to cool for at least 30–60 minutes.
- Improve ventilation: Ensure the MUSTART charger is not covered by objects, coiled cable, or installed in a sealed box. Provide at least several inches of clearance around the housing.
- Shade the unit: If installed outdoors, consider shading the charger from direct sunlight, especially in hot climates.
- Reduce current: On adjustable models, lower the charging current setting (e.g., from 40 A to 24–32 A) to reduce heat generation.
- Persistent E5: If E5 occurs quickly even in cool conditions, the internal temperature sensor or power relay on the main control board may be failing and requires professional replacement.
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Repair Difficulty
Medium
3/5
Required Part
Main Control Board (Temperature Sensor / Power Relay)
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