RV Fridge Not Cooling: Repair or Replace?

Most RV fridges are absorption units. Instead of a compressor, they use a small boiler that heats an ammonia and water solution, powered by either a propane flame or an electric heating element. That heat drives the whole cooling cycle, so anything that weakens the heat source or blocks the flow inside the unit will stop the fridge from getting cold.

Because the design depends on heat and gravity rather than a pump, it is sensitive to things a household fridge never notices. Parking off level, a dirty burner, poor ventilation behind the unit, or months of sitting unused can all cause weak cooling. In many cases the fridge itself is fine and the fix is small.

Newer RVs often carry 12 volt compressor fridges instead. Those behave more like a household fridge and have their own failure patterns, but the repair or replace logic below still applies.

Start with level. An absorption fridge needs the RV close to level to circulate properly, and running one badly off level for long periods can permanently damage the cooling unit. Next, try both power sources. If the fridge cools on electric but not on propane, or the other way around, the cooling unit is probably fine and the problem sits in the burner, heating element, or controls.

Open the exterior access vent behind the fridge and look for obvious trouble. Spider webs and rust in the burner area, blocked airflow, or melted or loose wiring are all common. Inside the fridge, check that the thermistor, the small sensor clipped to the fins, has not slipped out of place, and make sure the door seals still grip a piece of paper firmly.

Finally, give it time. Absorption fridges cool slowly. Starting warm on a hot Alberta day, a healthy unit can take eight hours or more to pull down to temperature, and longer if you loaded it with warm food and drinks.

Most problems outside the sealed cooling unit are repairable. That includes a fridge that works on one power source but not the other, weak cooling caused by ventilation or thermistor issues, a fridge that will not ignite on propane, control board faults, and worn door seals. These are parts and labour jobs, not a new fridge.

The sealed cooling unit is the exception. A strong ammonia smell inside the fridge, a yellow powder residue on the tubing at the back, or a unit that gurgles but never cools on any power source after a full day usually means the cooling unit has leaked or blocked internally. At that point the choice is a replacement cooling unit or a new fridge, and the right call depends on the age and condition of the rest of the unit.

One safety note. A leaking cooling unit contains ammonia and hydrogen under pressure. If you smell ammonia, shut the fridge off and leave it off until it has been looked at.

If levelling, power source checks, and a burner cleanup do not bring the temperature back, the next steps involve propane pressure testing, electrical diagnosis, and sometimes pulling the fridge from its cabinet. That is where a shop earns its keep. Horton RV Services in Calgary can diagnose the fault, source the parts, and give you an honest answer on whether a repair makes sense or the money is better spent on replacement.

It is also worth having the fridge checked as part of a broader inspection if you are buying a used RV in Alberta, since a failed cooling unit is one of the more expensive surprises a buyer can inherit. A quick test on both power sources before the sale can save a lot of grief later.