E19
Baxi Four-Way Reversing Valve Fault

Indoor unit shows E19; unit may not start in heating mode

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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

Stuck reversing valve, Faulty reversing valve coil, Incorrect wiring to valve coil, Faulty outdoor PCB output to valve

How to Fix / Troubleshooting

Safety: Isolate power before accessing the outdoor unit. Do not attempt to mechanically force the valve.

Steps:

  • 1. Listen for valve shift: When switching between cooling and heating, you should hear a distinct click from the reversing valve.
  • 2. Check coil wiring: With power off, inspect the two wires going to the reversing valve coil for damage or loose connections.
  • 3. Coil resistance: A technician can measure coil resistance; an open circuit indicates a failed coil.

Action: If the coil is good but the valve does not shift, the valve may be stuck internally or the PCB output is faulty. Replacement of the valve or outdoor PCB requires a refrigeration technician.

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Repair Difficulty

Professional Required 5/5

Required Part

Reversing Valve Coil
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