Rm2620 Dometic Reefer problem

Divide problem in half. Is it control issue or installation, venting, cooling unit issue? . Control issue test. At stated 38f turn refer to lp. so you can here flame activation or deactivation. Is flame off at 1 setting? If yes scroll slowly toward 5 setting briefly pausing between each command. A what number does flame come on? On a functioning thermistor and board the setting of 1 is 43f., 3 setting is 38f., and 5 setting is 34f.. if matches your readings and you want colder you need to engineer settings to go colder. Couple options, both items trick existing thermistor to keep refer on to achieve colder setting. dometic thermistor adjuster #2932164011 tricks to 5 degrees colder. Or Dinasaur "thermistor simulator for dometic" part is varable from 3 - 7 colder .