Does this indicate the ERC/control module is bad, or could it also be the glass touch pad panel? (I'm wondering why the buttons responded for a while during the last testing I did, then stopped responding all together - then they begin responding again after a "rest".)
Without having the schematics for the boards which are not available, it is a bit of a crap shoot.

Only Thing you may want to try is the signals from the adapter board to the control board. I do not know what these levels should be. The info indicates that the adapter strobes the keypad so there may not be a constant voltage on them.

Also I would clean the connections between the keypad to adapter to control board. Use isopropyl alcohol or electronics contact cleaner and a brush. Be gentle. Be sure to unplug the unit. Do not reconnect them till the solvent evaporates. I would also check the ribbon cables with a magnifying glass for hairline cracks across the conductors/tracks

If the above does nothing.

I would go with the control board since the DLB relay is activating so the unit is asking for heat but is not sending out which element should be activated.