Humidity Switch on Dometic RV Refrigerators

Many Dometic brand RV refrigerators are equipped with a humidity switch. The humidity switch powers a small heating element around the freezer door. The purpose is to control frost that may collect during very high humidity situations.

The heating element is not on the refrigerator on/off switch, So as long as the humidity switch is on the heating element is drawing power even if the refrigerator is turned off.

The heating element draws around 6 amps that will drain a battery in just a few hours. If your battery goes down for no apparent reason, check this switch!

You may want to read the following articles at

Is it Safe to Travel with My RV Refrigerator on Propane?
Keeping Your RV Refrigerator Cool… the Basics
The RV Handbook: Essential How-to Guide for the RV Owner, 3rd Edition


Share This Post

Post Comment

This site uses Akismet to reduce spam. Learn how your comment data is processed.