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What does the heater respond fault 4045 means?

Unit has an alert event 4045 heater respond. However, inverter would still be running.
Product Line:
This event code is triggered when one (or more) of the heaters is not working. Possible loose connection.

Performed Locked Out and Tagged Out (LOTO) on the inverter. Check to make sure that the extended IO card (A15) to the heater or humidity controllers (ST1 or ST2) is not loose, also check connection to the terminal block XT16. If it is fine then call us at 866-519-1470 option 3 & 3 for further assistance.
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