A19
Hoval
Controller communication failure
Furnace shows communication error with Hoval TopTronic or main controller
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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
Loose bus cable between Hoval furnace and controller, Incorrect bus wiring polarity, Faulty controller module, Electrical interference on bus line
How to Fix / Troubleshooting
Safety: Turn off power before working on control wiring.
- Check bus connections: Locate the communication terminals (e.g., CAN, RS485) on the Hoval controller and furnace. Ensure all wires are firmly clamped.
- Verify polarity: Confirm that the + and – (or A/B) wires are not reversed between devices.
- Inspect cable: Look for damage, tight bends, or routing alongside high-voltage cables. Re-route if necessary to reduce interference.
- Power cycle: Restore power and perform a controlled restart of the controller and furnace. If the error persists, a controller module may be defective.
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Repair Difficulty
Medium
3/5
Required Part
Hoval Controller Module
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