Cause of error code #W01

Blinking Screen – Press “Reset” key to view this message

- Outdoor Sensor Shorted

Solution for error code #W01

- Check wiring connection to Outdoor Sensor.
- Remove the wires from terminals #3 and #4 on the boiler and check the resistance between them.
- If this reading is below 3000 Ω check the reading at the sensor.
- If the reading is the same at the sensor, replace the sensor.
- If the reading is higher at the sensor, replace the wiring.