E15
Schneider Electric
Safety Lockout Condition
E15 displayed and thermostat indicates lockout due to repeated sensor or output faults.
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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
Multiple consecutive over-temperature or sensor errors, Repeated short-cycling of compressor output, Internal safety algorithm triggered by abnormal operation, Misconfigured safety thresholds
How to Fix / Troubleshooting
Safety: Investigate and correct the underlying cause before clearing lockout.
Steps:
- Review the thermostat event log (if available) to identify which errors preceded E15 (e.g., E01, E03, E11).
- Correct any sensor, wiring, or configuration issues indicated by prior errors.
- Power off the HVAC equipment and thermostat for at least 5 minutes to allow internal safety timers to reset.
- Restore power and monitor operation. Avoid rapidly changing setpoints or modes, which can cause short-cycling.
- If E15 reappears without clear cause, the internal safety logic or hardware may be defective; consult a professional and consider replacing the thermostat.
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Repair Difficulty
Medium
3/5
Required Part
Thermostat Safety Control Logic
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