After the unit is heating for 1 minute there is a click (like a relay went off) and no more heat is produced. The electronic control board was replaced (new one) but the problem remained. The only 2 options are to replace the heating element or the front-keypad-console.
Well you can test the heating element. Check it for proper ohms and examine it to make sure it is not shorting out against the frame.
I turned it on and no heat came out. I removed the back panel and then tried it again. The heating unit became warm very quickly and then shut off after 10-15 seconds. The electronic control board has already been replaced. Could it be a relay within the front panel-the interface where you press the buttons?