E15
MUSTART
Low Temperature Protection / Sensor Out of Range
Display shows “E15” and charging stops; often associated with very low ambient temperatures.
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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
Ambient temperature below operating range, failed temperature sensor reading extremely low, sensor wiring fault on main control board
How to Fix / Troubleshooting
Safety warning: Do not attempt to heat the charger with open flames or high‑heat devices.
- Move to warmer area (portable units): If using a portable MUSTART charger, move it to a garage or sheltered area within the specified temperature range.
- Allow gradual warming: Let the unit sit unpowered in a warmer environment for several hours to equalize temperature and reduce condensation risk.
- Re‑test: After warming, reconnect power and check if E15 clears.
- Sensor fault: If E15 appears even at normal room temperature, the internal temperature sensor or its circuit on the main control board is likely faulty and requires service.
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Repair Difficulty
Medium
3/5
Required Part
Main Control Board (Temperature Sensor Circuit)
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