E10
EcoSmart
Supply Voltage Out of Range
Unit shows E10 and will not start heating; often associated with incorrect supply voltage.
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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
Incorrect wiring (single leg only, missing phase), Low line voltage under load, Wrong breaker configuration, Loose supply lugs at heater or panel
How to Fix / Troubleshooting
Safety: This involves live electrical measurements. If you are not comfortable or qualified, contact an electrician.
- Verify breaker and wiring: Confirm the EcoSmart heater is connected to the correct size double-pole breaker and that both hot legs are present.
- Check terminal tightness: With power OFF, tighten the supply lugs at the heater and at the breaker panel to manufacturer torque specs.
- Measure voltage: With a multimeter and appropriate PPE, measure voltage between the two hot legs at the heater’s input terminals. It should match the unit’s rated voltage (e.g., ~240 VAC). Also measure each hot leg to ground.
- Correct wiring errors: If only one hot leg is present or voltage is significantly low, have an electrician correct the supply wiring or service the panel.
- Retest: Once proper voltage is restored, cycle power to the heater and check if E10 clears.
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Repair Difficulty
Hard
4/5
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