A19
Beretta
Communication Fault with External Controller
Display shows A19, furnace may not respond to external control signals
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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
Broken communication cable to Beretta remote control, Incorrect wiring polarity, Faulty external controller, Control board communication port failure
How to Fix / Troubleshooting
Safety: Turn off power before handling communication wiring.
- Check cable: Inspect the low-voltage cable between the furnace and the Beretta remote or room controller. Look for cuts, pinches, or loose terminals.
- Verify polarity: Ensure the + and – terminals are wired consistently at both ends as per the installation manual.
- Test with simple thermostat: If possible, temporarily connect a basic on/off thermostat to the standard thermostat terminals to see if the furnace operates normally. This helps isolate the fault to the controller or communication line.
If A19 remains, the external controller or the furnace control board may require replacement.
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Repair Difficulty
Medium
3/5
Required Part
Beretta Remote Controller
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