Cause
IrE, IR Sensor is not detected. (Will only be displayed in test mode).
Solution
Check the connector to the tub lamp, (IR Sensor).
Check for 5Vdc coming from the Main PCB.
The IR error will only be displayed when the unit is in test mode. You will see 5Vdc across the GREEN and BLACK wires when the unit is running.
If there is no 5Vdc, to the sensor, replace the Main PCB. If there is 5Vdc, replace the Lamp/IR sensor assembly.