Heater shows E19, may be associated with communication between different internal modules.

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.

Possible Causes

Loose or damaged communication harness between boards, Faulty expansion module (if fitted), Main PCB communication driver failure, Electrical interference

How to Fix / Troubleshooting

Safety: Isolate power before accessing internal wiring.

Steps:

Reseat connectors: Identify any low-voltage communication cables between boards (e.g., display, expansion modules) and reseat them.
Inspect for damage: Look for crushed cables or signs of rodent damage.

Professional: Module or PCB replacement and communication diagnostics should be done by an authorised Baxi technician.

Repair Difficulty

Hard 4/5

Required Part

Control PCB Communication Harness

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