Dou Therm 57915.622 won't work.
I have a 1999 Newmar American Star XL With one roof air (57915.622) and one furnace (I have not found a label on it yet) with a 4 button thermostat, that I just picked up and they didn't work at that ...
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DOMETIC, NOT Duotherm:) I don't know who you talked to, but you CAN upgrade to the 5 button wall tstat and 5 button board on the AC unit. Are you positive you talked to Dometic and not one of those aftermarket companies that pops up on google searches and LOOKS like the company you are trying to find? Duotherm name has not been used in over 35 years even tho they may have the Duotherm logo on the AC shroud. You just need this kit in the link I have provided. The 4 button was discontinued in 2001 and they went to the 5 button. There are NO 4 button Tstats anywhere. Doug
https://pantherrvproducts.com/3310009-000/?sku=3310009.000&gclid=Cj0KCQjwqoibBhDUARIsAH2OpWjyaUzVTwQxcb3ekY_5ISOKrGbd48a235Nl76bHW34iU4F2OJp-nu4aAkP8EALw_wcB
When you look at the pic in the link, you will see a blue ended wire. THAT is the NEW style freeze sensor and MUST be used. You remove the OLD style freeze sensor which looks like a large button about 1 inch in diameter.
This link shows what it looks like.
https://www.amazon.com/Dometic-3309191009-Freeze-Control-Sensor/dp/B00JF1WC0Q
https://pantherrvproducts.com/3310009-000/?sku=3310009.000&gclid=Cj0KCQjwqoibBhDUARIsAH2OpWjyaUzVTwQxcb3ekY_5ISOKrGbd48a235Nl76bHW34iU4F2OJp-nu4aAkP8EALw_wcB
When you look at the pic in the link, you will see a blue ended wire. THAT is the NEW style freeze sensor and MUST be used. You remove the OLD style freeze sensor which looks like a large button about 1 inch in diameter.
This link shows what it looks like.
https://www.amazon.com/Dometic-3309191009-Freeze-Control-Sensor/dp/B00JF1WC0Q
