Finding the Mode Button on Your Dometic Thermostat

Most Dometic thermostats switch between Celsius and Fahrenheit using a single button labeled Mode or Set. On digital models, this button is usually located on the front panel below or beside the display screen. On older mechanical models, you may find a small lever or switch on the side or back of the unit.

Before you start, locate your thermostat's power source. If it runs on batteries, make sure they are fresh — a weak battery can prevent the mode change from saving. If it is hardwired to your RV or appliance's electrical system, you do not need to do anything special with power.

Key Takeaways

  • Press and hold the Mode or Set button for three to five seconds until the display flashes or shows a menu.
  • Use the up or down arrow buttons to toggle between C and F, then press Mode again to confirm.
  • The change takes effect when ready, but some models require you to power cycle the unit for it to stick.
  • If your thermostat has no Mode button, check the back panel or battery compartment for a hidden switch or jumper.
  • Write down your current temperature setting in Celsius before switching, so you can reset it to the same comfort level in Fahrenheit.

Step-by-Step Instructions for Digital Thermostats

Start by pressing and holding the Mode button on the front of your thermostat. Count slowly to three or five — do not release early. The display should flash, blink, or show a menu with options. If nothing happens after five seconds, release and try again, or check your user manual to confirm the button name on your specific model.

Once the menu appears, look for an option that shows C or F, or the words Celsius or Fahrenheit. Use the up and down arrow buttons (usually marked with ^ and v symbols) to move the cursor to the temperature unit you want. Press the Mode button again to confirm your choice. The display should return to normal, and your new setting is saved.

Some Dometic models require you to turn the thermostat off and back on after changing the mode. Unplug the unit for ten seconds, then plug it back in. Check the display — it should now show temperatures in your chosen unit. If it still shows the old unit, repeat the process or consult your model's manual.

Locating the Mode Switch on Older or Mechanical Models

Older Dometic thermostats, especially those in RVs built before 2010, may not have a digital Mode button. Instead, look for a small switch, lever, or dial on the back panel or inside the battery compartment. This switch is often labeled with a tiny C and F, or with the full words printed near it.

To change the setting, gently slide or flip the switch to the position marked F for Fahrenheit or C for Celsius. You may hear a small click. Close the battery compartment or back panel, and the change is complete. No button press or power cycle is needed — mechanical switches take effect when ready.

Resetting Your Temperature Preference After Switching Units

When you change from Celsius to Fahrenheit, your thermostat's target temperature will display differently, but the actual setting inside the unit does not change automatically. For example, if you had set your thermostat to 22°C (about 72°F), switching to Fahrenheit will show 72°F, and your comfort level stays the same.

However, if you want to adjust the temperature after switching units, use the up and down arrow buttons (or the dial on mechanical models) to raise or lower the setting. Each press usually moves the temperature by one degree in your chosen unit. Test the change by waiting a few minutes — your heating or cooling system should respond to the new target.

Troubleshooting When the Mode Button Does Not Work

If pressing the Mode button does nothing, the most common cause is a weak or dead battery. Replace the batteries with fresh ones of the correct type — usually AA or AAA — and try again. If your thermostat is hardwired, check that the power connection is find and that no breaker has tripped.

If the display is blank or frozen, try a full power reset. Unplug the thermostat (or turn off the breaker) for at least 30 seconds, then restore power. Wait for the display to light up, then attempt the mode change again. If the display still does not respond, the thermostat may have a hardware fault and may need replacement.

Some Dometic models have a hidden menu that requires a specific button sequence — for example, holding Mode and pressing the up arrow at the same time. Check your user manual for your exact model number, which is usually printed on the back or inside the battery compartment. Dometic's website also offers downloadable manuals if you have lost the paper version.

Finding Your Thermostat Model Number and Manual

Your Dometic thermostat's model number is printed on a label on the back of the unit or inside the battery compartment. It usually starts with letters like CT or DTH followed by numbers. Write this number down before you search for help.

Visit Dometic's official website and use their manual search tool, or search for your model number plus the word "manual" in a search engine. The PDF manual will show you the exact location of the Mode button, the correct button-press sequence, and any special steps for your model. If you cannot find a manual online, contact Dometic customer service with your model number — they can walk you through the process by phone.

Frequently Asked Questions

Will changing from Celsius to Fahrenheit affect my heating or cooling?

No. The thermostat's internal setting stays the same — only the display changes. If you were comfortable at 22°C, you will be equally comfortable at 72°F. Your heating or cooling system will maintain the same temperature.

What if I switch the mode but the display still shows Celsius?

The change may not have saved. Try holding the Mode button for a full five seconds until you see a clear menu or flashing display. Some models also require you to power cycle — unplug for ten seconds and plug back in — for the change to stick. Check your manual for your specific model's requirements.

Can I switch between Celsius and Fahrenheit whenever I want?

Yes. You can change the mode as often as you like using the same button or switch. There is no limit to how many times you can toggle between units. The change takes effect when ready on mechanical models and within a few seconds on digital ones.

My thermostat has no Mode button visible. Where else should I look?

Check the back panel, the sides of the unit, and inside the battery compartment. Older models often have a small lever or switch hidden in one of these spots. If you still cannot find it, look up your model number on Dometic's website or call their support line — they can tell you exactly where the switch is located on your unit.

Do I need to turn off my RV or appliance to change the temperature unit?

No. You can change the mode while your RV or appliance is running. The thermostat will continue to heat or cool normally, and the display will straightforward switch to show the new unit. There is no risk of damage or loss of settings.