Operating Temperature Sensor detects Water Temperature Greater than 203ºF (95ºC).
Press the Power button to clear the Error Code.
If Error happens again:
- Check if dip switch High Fire setting is ON. Switches 6 and 7 should be OFF for normal operation.
- Check if CH inlet pipe is blocked. Ensure there is enough water flowing to the boiler.
- Check Operating Temperature sensor at CH heat exchanger outlet. If resistance is zero, replace the sensor.
- If the problem persists, replace the main control.
