E08 error and the display shows abnormal temperature or shuts down in very cold or hot environments.

Safety first: Disconnect power before opening the control housing. Avoid operating the softener outside the temperature range specified in the AquaHouse manual.

Step-by-step:

• 1. Check ambient conditions: Verify the softener is not installed in a freezing area or in direct sunlight/near a boiler. If so, improve insulation or ventilation and allow the unit to return to normal temperature.
• 2. Power reset: Unplug the unit for 5 minutes, then reconnect. If E08 clears and does not return, it may have been a temporary over/under-temperature condition.
• 3. Inspect board connections: Remove the control cover and check for a small thermistor or temperature sensor on the PCB. Ensure it is not physically broken and that any related connectors are secure.
• 4. Look for moisture damage: Condensation or leaks can corrode the sensor area. Dry the board gently and correct any external leaks before reapplying power.
• 5. Replace PCB if needed: If E08 persists under normal ambient conditions and wiring is intact, replace the AquaHouse main control board, which includes the temperature sensing circuit.