Massive Heat Wave, AC not working. - HELP

dougrainer wrote:
The CONTROL package is that silver box. Your control is an Analog with standard tstat wires going from the Control Box to the tstat. Yes, you can update to the 12 button if you buy a new Penguin. The New Penguin will have the "Control Box circuit board" installed already. The Tstat(12 button) to the Penguin uses a 4 wire Phone type Communication cable. What you will do is use 4 of the wires on the existing tstat wire harness and splice a Phone Modular connection on each end. Dometic used to make this type adapter for the modular plug, but you can splice and make your own. Just follow the 4 wire color code on any of the Dometic CCC wiring diagrams you can find on the Internet. Doug