E16
American Standard Dehumidification Control Fault

Thermostat shows E16 and dehumidification or overcooling features do not work

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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 dehumidification setup, Miswired DHUM or ACC terminals, Failed dehumidification relay, Incompatible equipment configuration

How to Fix / Troubleshooting

Safety: Turn off power to HVAC equipment at the breaker before adjusting wiring.

  • Confirm dehumidification method: In installer settings, verify whether dehumidification is via AC overcooling, dedicated dehumidifier, or variable-speed blower control, and that this matches the installed American Standard equipment.
  • Check DHUM wiring: Inspect the dehumidification control wiring at the thermostat and at the air handler or dehumidifier. Tighten loose terminals and correct any miswiring.
  • Test basic AC operation: Ensure standard cooling works normally. If cooling is also affected, the issue may be broader than dehumidification.

Note: Persistent E16 with correct wiring may indicate a failed thermostat output; replacement may be required.

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Repair Difficulty

Hard 4/5

Required Part

American Standard thermostat dehumidification output
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