E7
Daikin
Four-Way Valve (Reversing Valve) Malfunction
Reversing valve does not switch between heating and cooling; E7 error logged
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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 reversing valve coil, Stuck valve slide, Incorrect wiring to valve coil, Faulty outdoor PCB output
How to Fix / Troubleshooting
Safety first: Power off the unit before accessing the reversing valve coil. Refrigerant circuit must not be opened without proper equipment and certification.
Technician steps:
- Check coil resistance and continuity; replace the coil if open.
- Verify that the coil is receiving the correct voltage when switching modes.
- If the coil energizes but the valve does not shift (no change in pressures or line temperatures), the valve may be mechanically stuck and require replacement.
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Repair Difficulty
Professional Required
5/5
Required Part
Reversing Valve Coil / Assembly
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