E8
Salus Internal Communication Bus Error

Thermostat shows E8 and cannot communicate with associated devices or complete setup.

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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

Faulty internal communication between RF module and main MCU, Damaged RF daughterboard connector, Firmware incompatibility between modules, ESD damage to communication lines

How to Fix / Troubleshooting

Safety first: Remove power or batteries before opening the thermostat casing.

Steps to check:

  • Power-cycle: Remove power for several minutes, then restore. Temporary bus lockups can clear with a full restart.
  • Check RF module seating: On some Salus smart thermostats, the RF or Zigbee/Z-Wave module is a small plug-in board. With power off, gently press the module to ensure it is fully seated in its connector.
  • Update firmware: For app-connected models, check the Salus app for available firmware updates and apply them, ensuring power and internet remain stable during the process.
  • Reduce interference: Keep the thermostat away from strong RF sources (Wi-Fi routers, DECT phones) that may interfere with internal communication.

Resolution: If E8 persists, the internal RF module or main PCB is likely defective. Replace the thermostat head or RF module as supplied by Salus.

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Repair Difficulty

Medium 3/5

Required Part

Salus thermostat RF module
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