TA model error codes
This heater is equipped with a digital temperature display. The temperature being shown represents the air nearest the control cover. The temperature of the air in the surrounding area may be much different from the temperature being displayed. The display may show  when the thermostat control or temperature sensor are disconnected from control or if they are damaged. If this occurs, control will continue to operate as before. However, the unit will not cycle off during operation. See Figure 13
This heater will display error codes whenever there is an abnormal shutdown or problems with supply voltage. Make sure you have read all instructions and see Troubleshooting, before attempting to rectify any problems with your heater.