Installation Instructions
Owner's Guide
Page
49
Troubleshooting
-ERROR CODES-
-General-
• The micro-boiler has self-diagnostics for safety and convenience when troubleshooting.
• If there is a problem with the micro-boiler itself, or the installation of the unit, the error code will be
displayed on the temperature controller.
• Consult with the table on the following pages for the description of each error code.
• Indicator on the controller: "321" will be displayed on the screen in its
entirety.
• Green LED on the computer board: The green LED on the computer
board will be blinking two times.
Green LED
Error code indicator on the temperature
controller
Error code
Example: If your unit has the "321" error code (which signies an inlet thermistor failure)