1. THERE IS NO INDICATION OF A BAD 120 ELEMENT on Dometic refers. Other than NO COOL on AUTO.
2. Access the rear Main control board. Find the 120 element in the Burner flue sleeve. There will be 2 wires. Those wires go to the rear control board. VERY carefully. With the rear control board cover removed, you will see the 2 spade wire connections from the 120 element. With the refer ON and on Auto, check for 120 volts between the 2 Heat element spades. If you have 120 volts the 120 element is bad. If you do NOT have 120 volts, go beside the spade connections and you will see where the 120 power cord connects to the control board. See is you have 120 volts. If you do, then the control board is bad. Doug
