The Truma Combi’s water container must be drained to avoid damage whenever there is a risk of frost while your RV is not in use. After draining the water, the Combi furnace is protected against freezing conditions.
Step 1: Begin by turning off the Truma Combi and give the unit time to cool down. Place a vessel that’s at least 2.64 gallons (10 liters) underneath the drainage outlet of the drain valve, to catch the drained water. Make sure all of the water drains from the Combi.