E14
Johnson Controls
Dehumidification Output Fault
Thermostat shows E14 and indicates dehumidification control fault; dehumidifier or over‑cooling function not working.
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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
Open or shorted dehumidification output terminal (DH/DEH), Miswired dehumidifier control circuit, Failed dehumidification relay on thermostat PCB, Incorrect installer configuration
How to Fix / Troubleshooting
Safety: Turn off power to HVAC and any connected dehumidifier before working on wiring.
- Step 1 – Verify configuration: In the installer menu, confirm that dehumidification is enabled and correctly set for your system type (whole‑home dehumidifier vs. over‑cooling).
- Step 2 – Inspect wiring: Check the DH/DEH terminal at the thermostat and at the dehumidifier or air handler. Ensure correct connections per Johnson Controls wiring diagrams.
- Step 3 – Check for shorts: Look for bare wires touching each other or metal surfaces along the dehumidifier control cable.
- Step 4 – Test output: With a dehumidification call active, measure voltage or continuity on the DH output as specified by your model (some provide dry contacts, others 24 VAC). If no change occurs, the thermostat relay may be failed.
- Step 5 – Replace thermostat or relay module: If wiring and configuration are correct but E14 persists, replace the thermostat main control board or the dedicated dehumidification relay module if separate.
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Repair Difficulty
Hard
4/5
Required Part
Dehumidification Output Relay / Main Control Board
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