Indoor unit shows E21; the unit may not respond to the remote control.

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.

Possible Causes

Faulty IR receiver board, Disconnected receiver cable, Faulty indoor display PCB, Main indoor PCB communication failure

Safety: Disconnect the power before removing the front panel.

Steps:

1. Check the remote first: Replace batteries and verify that the remote emits IR (view through a smartphone camera while pressing a button).
2. Inspect the receiver board: Remove the front cover to access the IR receiver/display board. Ensure its cable is firmly connected to the main PCB.
3. Look for damage: Check the receiver board for cracks, water damage, or burnt components.
4. Replace the receiver board: If damaged or unresponsive, replace it with a Baxi-compatible display/receiver module.

Note: If E21 persists with a new receiver, the indoor main PCB may be defective.

Medium 3/5

IR Receiver / Display PCB

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