E7
Aprilaire
Internal Control Board Fault
Aprilaire dehumidifier shows E7 and shuts down
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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
Failed main control board, Power surge or lightning damage, Internal relay or microprocessor failure, Incorrect line voltage supply
How to Fix / Troubleshooting
Safety first: Turn off the circuit breaker to the dehumidifier and verify power is off with a non-contact tester before opening the electrical compartment.
- Verify supply voltage: Confirm the unit is connected to the correct line voltage (typically 120 VAC for residential models). Use a multimeter at the input terminals to ensure voltage is within the specified range.
- Inspect board: Remove the access panel and visually inspect the main control board for burnt components, cracked solder joints, or corrosion.
- Check ground and neutral: Ensure the ground wire is securely attached and the neutral connection is tight. Poor grounding can contribute to board failures.
- Power reset: Leave power off for 5–10 minutes, then restore. If E7 reappears immediately, the board is likely defective.
- Replace board: Label all connectors, then remove and replace the Aprilaire dehumidifier main control board with the correct part number. Reconnect wiring exactly as before and secure the panel before restoring power.
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Repair Difficulty
Professional Required
5/5
Required Part
Aprilaire Dehumidifier Main Control Board
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