How To Change a Dometic Thermostat From Celsius to Fahrenheit

Not everyone likes Celsius. While 7/8ths of the world uses the metric system including telling the temperature, not everyone likes that system. It can be confusing especially if you do not know how to use the equation to make the conversion.

It is not hard to get your Dometic thermostat to read Fahrenheit instead of Celsius. You have to hold the right buttons to get it to change. However, not every model of thermostat changes their scale the same way.

To learn more about doing this action, just continue to read our article. It has the information you want to know about so you can easily make the change and understand how cold or hot it is outside. It only takes a few seconds to make the change.

Dometic Thermostat Celsius To Fahrenheit


If your model of Dometic thermostat has the + and the - signs on the right side, the temperature reading in the middle, and the mode button on the left side, there is not much work to make the change.

All you have to do is push the + and the - buttons at the same time and the thermostat should automatically change. Those instructions come from page 6 of the Dometic 3313192 Series manual. You can find that page at this link.

You may find that older Dometic thermostats have a C/F button on their face. If yours does, then just press that button and the thermostat should change quickly.

You may not have to press these two buttons for very long before the change occurs. It has been reported that all it takes is about 1 second and the thermostat will convert the scale for you

But check your model as it may be one that requires you to hold the mode button for 5 seconds before the temperature scale can be changed from C to F. On some models these instructions may apply:

1. Press and hold the “Set” button for about 5 seconds

2. Use the up or down arrow buttons to scroll through the menu options

3. Select the “System” option

4. Select the “Units” option

5. Use the up or down arrow buttons to scroll through the unit options

6. Select the “Fahrenheit” option

7. Press the “Set” button to save the changes

Once that is done your thermostat should read the temperature in Fahrenheit.

Dometic Thermostat Fahrenheit To Celsius


For this objective, all you have to do is touch the same two buttons again. This is not rocket science and the company has kept this process very simple. But the furnace or air conditioner is not the only two appliances that need this conversion.

Your Dometic fridge has a thermostat as well and the conversion process is a little longer than the heating thermostat conversion process. Here are the instructions for some Dometic fridges:

1. Locate the thermostat. On most units, it is at the front

2. Using a flathead screwdriver remove the 2 screws holding the thermostat in place

3. Carefully pull the thermostat out of its position and look at how the wires attached at the back

4. Flip the thermostat over and look for that temperature switch on the back of this device

5. Using the flathead screwdriver once again, flip that switch from C to F.

6, Reattach the wires and place the thermostat back in its place. Put the screws back in and you are done.

Dometic Thermostat Stuck on Celsius


The only instruction anyone has been giving is for you to simply press the + and the - buttons and the thermostat will make the switch. But if that does not work, you can try resetting the thermostat. Here are instructions for that process:

1. Make sure the Single Zone LCD thermostat is in the Off Position.

Press the “+” button and, while holding it, also press and hold the On/Off Mode button for 3 seconds. The LCD will show –, press the On/Off Mode again to turn the system off. This completes the system initialization.

2. Reset My Dometic 5 Button Thermostat?

- Turn the thermostat switch off.

- Press both the mode and zone buttons at the same time then turn the switch back to ON.

- The letters FF should appear in the digital display and will remain there until you release both the zone and mode buttons.

- Release the buttons when they do. Your system should be reset and ready to work.

Resetting should allow you to move the thermostat from C to F with ease. If you are still having trouble with the thermostat, talk to your dealer to see if the device has failed.

Dometic Thermostat Error Codes


E1- loss of communication between the thermostat and all system module boards

E2- open circuit or out-of-range indoor temperature sensor

E3- shorted indoor temperature sensor

E4- Open circuit or out-of-range Outdoor Temperature Sensor - not all models

E5- Open circuit or out-of-range Freeze Sensor

E7- Loss of 120 Vac power to all power module boards on the system

E8- Invalid zone configuration

E9- Invalid zone configuration

If you are having trouble with the buttons not moving, then dirt or dust has clogged them up. You would need to clean your thermostat to get those buttons working again.

Some Final Words

Dometic and other RV appliance companies do work hard to keep some procedures as simple as possible. Changing the thermostat is one of those procedures. It may take about 3 seconds for you to make the change.

If you are still having trouble with your thermostats call in an approved repairman to look at it. The problem may be an easy fix and there is no point in going to the dealer and spending more money.

Leave a Comment: