Protherm
Accessory Detection / Bus Configuration Issue
Thermostat fails to detect or control Protherm-compatible accessories (e.g. external sensors, zone modules) after installation.
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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
Accessory not powered, Incorrect bus wiring, Accessory not enabled in settings, Address conflict on bus
How to Fix / Troubleshooting
Safety: Isolate power to all bus devices before wiring changes.
- Step 1 – Confirm accessory compatibility:
- Verify that the accessory model is supported by your Protherm thermostat.
- Step 2 – Check power and wiring:
- Ensure accessory has correct power supply and bus connections.
- Follow Protherm wiring diagrams.
- Step 3 – Enable accessory in settings:
- In installer menu, enable the specific accessory type (e.g. external sensor, zone module).
- Step 4 – Resolve address conflicts:
- Set unique addresses on each bus device using DIP switches or software.
- Step 5 – Reboot system:
- Power cycle thermostat and accessories to force re-detection.
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Repair Difficulty
Medium
3/5
Required Part
Protherm Bus Wiring / Accessories
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