Fridge Not Cooling — Diagnosis Guide

What This Is

Motorhome fridges use an absorption cooling system — very different from a domestic compressor fridge. They are sensitive to levelling, ventilation, and power supply. Understanding how they work makes diagnosis much easier.

Tools & Parts Required

Step-by-Step Instructions

1. 1

   Check that the fridge is level. Absorption fridges must be within 3 degrees of level to work correctly. If you are parked on a slope, the fridge will not cool efficiently or at all.

2. 2

   Check the power source. Absorption fridges typically run on 12V (driving), 240V (hook-up), or gas. Check that the correct energy source is selected on the fridge control panel.

3. 3

   Check the rear ventilation. Absorption fridges require good airflow over the cooling unit at the back. The external vents (usually on the side of the vehicle) must be clear of obstructions.

4. 4

   On gas mode, check the gas supply. Try the hob to confirm gas is flowing. Check the fridge burner — it should show a small blue flame through the inspection window.

5. 5

   Allow adequate cooling time. An absorption fridge takes 4–6 hours to reach operating temperature from ambient. Do not judge performance after only an hour.

6. 6

   Check the fridge door seal. Close the door on a piece of paper — you should feel resistance when pulling it out. A poor seal allows warm air in and significantly reduces cooling performance.

7. 7

   On 12V mode, check the battery voltage. Below 11.5V, the fridge heating element will not work efficiently. This mode is intended for use while driving, not for extended static use.

8. 8

   If none of the above resolves the issue, the cooling unit may have failed. Signs include a yellow/brown residue around the back of the fridge, or an ammonia smell. This requires professional repair or replacement.

Common Mistakes to Avoid

Safety Warnings

When to Call a Professional