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Error code on One Controller 002/003.
Cause: No fault - These codes show the boiler is in chimney sweep mode (service mode), the same as codes 180 &
181.
Random fault codes on One Controller.
Cause: Faulty battery or controller.
1. Check battery for swelling. If swollen, replace the battery.
2. If battery is OK, perform a factory reset on the controller by removing the controller from the wall. Then use
a pen or small screwdriver and press the reset button on the rear of the controller.
3. If the reset does not work, replace the One Controller.
LMU Sub codes.
LMU sub codes that can be displayed on the plug-in digital programmer and description of the codes on the ONE
controller and notifications that are shown on the app.
If an error code is still on the display of the boiler e.g., 129, then you can plug in the digital programmer to the blue
BUS connection on the back of the board. If the error code has been reset and the display says ‘OK’ then you will not
be able to see the error sub code.
So, when you plug in the digital programmer the boiler display will show e.g., 129 and the digital programmer will
power up and display an error sub code e.g., 2, which in this case is ‘Fan failure low rpm’. This means the rpm of the
fan was too low and you just replace fan.
Therefore, the plug-in digital programmer can be used as a diagnostic tool to help indicate the fault on the boiler
with the displayed sub codes.
*Codes on next 2 pages*.
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