RV Refrigerator Freezing Everything: Fix Temperature Control Issues Fast!

Tools & Parts Needed

Find these on Amazon: Digital Multimeter , RV Refrigerator Thermistor , Wire Nut Assortment

In Brief

Your RV refrigerator temperature is primarily controlled by a temperature control board (also called a power control board) that works with a thermistor and damper system. When everything freezes on warm settings, the most common culprits are a faulty damper control, malfunctioning temperature control board, or blocked airflow between compartments.

Prep Work

• Multimeter
• Flashlight or headlamp
• Screwdriver set
• Wire nuts (if replacing components)
• Replacement damper or control board (if needed)

Making It Right

1. Check the damper control first: Look for a small motorized damper door inside your fridge compartment, usually near the back wall where cold air enters from the freezer. This damper should open and close as the temperature changes. If it's stuck open, cold air flows continuously into the fridge.
2. Test damper operation: Turn your fridge to the warmest setting and wait 30 minutes. The damper should be mostly closed. Turn to coldest setting - it should open wider within 30-60 minutes.
3. Inspect the temperature control board: Located behind the fridge (Dometic) or in various positions depending on model (Norcold), this board has LED lights that indicate operational status. Consult your manual for the specific light pattern meanings.
4. Test thermistor resistance: SAFETY FIRST - disconnect power to the refrigerator before testing electrical components. Use a multimeter to check the thermistor resistance. At room temperature (70°F), resistance values vary by manufacturer - consult your service manual for specific thermistor specifications.
5. Check for airflow blockages: Remove all food and shelving. Look for ice buildup or debris blocking the air passages between freezer and fridge compartments.
6. Verify proper installation: Ensure your RV is level - even a slight tilt can affect refrigerator operation and cause temperature control issues.

Leave These to the Experts

Contact an RV refrigeration specialist if you encounter:

• Yellow staining or ammonia smell around the cooling unit
• Refrigerator not cooling at all on any power source
• Gurgling or unusual sounds from the cooling unit
• Repeated control board failures
• Any propane-related issues

Cooling unit replacement or major refrigerant work requires specialized tools and certification.

Avoid Future Headaches

Keep your RV refrigerator running optimally with these practices:

• Keep your RV level when parked - use leveling blocks
• Clean the exterior cooling coils annually
• Don't overload the refrigerator - allow air circulation
• Check door seals regularly and replace if worn
• Use a small fan inside to improve air circulation
• Keep the external vents clear of debris