An RV fridge is a different animal from the one in your kitchen. Most Dometic and Norcold units are absorption fridges: no compressor, no hum, no fan. A heat source boils an ammonia-water mix, and gravity plus chemistry pull heat out of the box. Quiet, runs on propane, great for boondocking. It also fails in ways that throw people who are used to a standard fridge.
Plenty of RV owners search for help with these and get almost nothing honest. Here’s the real picture.
Two things matter more than anything else
Because the cooling depends on liquid moving by gravity, the rig has to sit reasonably level and the airflow behind the fridge has to be clear. Get either wrong and cooling drops even when nothing’s broken. That’s the first thing we rule out, and it’s the first thing you should too.
Why it’s “not cooling”
- Off level. Park tilted for hours and the fluid pools, cooling fades, and if you run it that way long enough you can ruin the cooling unit. Level first, every time.
- Blocked airflow. These fridges dump heat through a lower sidewall vent and a roof vent. Wasp nests, dust, and stored gear behind the unit trap it. Clear the back, the coils, and both vents.
- Weak or dirty gas burner. On propane, a clogged orifice or a sooty flue starves the flame. You’ll see a lazy yellow flame or one that won’t stay lit. A burner clean or swap clears a big share of gas-only no-cool calls.
- Electric element failure. Cools on gas but not on 120V and the AC element or its wiring is the suspect. That’s a metered test and a parts job.
- Board or thermistor. Both Norcold and Dometic use boards that fail with age and heat. A drifting thermistor tells the board the box is cold when it isn’t, so the heat never fires. Both are repairable once a tech confirms which.
- Leaked cooling unit. Yellow stain and a sharp smell behind the fridge means the sealed unit is done. Not a repair. A cooling-unit or whole-fridge replacement.
What you can check before calling
- Level the rig and give it a few hours to recover before deciding anything’s wrong.
- Pull the lower outside vent panel and clear nests, dust, and debris. Confirm air moves from the bottom vent up past the coils to the roof.
- On gas, watch the flame through the access panel. Steady blue is good. Yellow, flickering, or dead points at the burner, orifice, or propane supply. Stop there; don’t probe the gas line.
- Compare modes. Cools on electric but not gas is a gas-side problem. Cools on gas but not electric is an element or wiring problem. Dead on both, with clean vents and a level rig, means the board, thermistor, or cooling unit needs a tech.
- Look and smell behind the unit. Any ammonia residue or odor: stop, ventilate, call.
When to call us
Once the rig’s level and the vents are clear, the rest is tech work. Propane diagnosis needs the right gear and, in California, a CSLB contractor. Live-voltage testing isn’t DIY. Board and thermistor swaps look simple, but a wrong diagnosis means buying parts that don’t fix it.
The biggest thing a proper diagnosis does is tell you whether you actually have a cooling-unit failure, the expensive part. Most “dead” absorption fridges aren’t the cooling unit at all. You want to know which camp you’re in before spending anything real.
Bay Area Appliance Repair Service works on Dometic and Norcold absorption fridges across the Bay Area. The $75 diagnostic is credited to the repair, and after the diagnosis you get a written repair-or-replace call and price before any further work. For standard household units, see our refrigerator repair guide and the refrigeration repair service page.
Call (925) 999-4095 or email [email protected] to schedule a visit. Family-owned, founded 2021. CSLB #1136642, BEAR #50788, BBB A+.
FAQ
Why does it work on shore power but not propane? Gas-side issue: dirty orifice, weak flame, clogged flue, or low propane pressure. The cooling unit’s fine since it cools on electric.
Is a leaked cooling unit worth fixing? You can’t repair a leaked cooling unit, but you can replace it or the whole fridge. A diagnosis confirms the leak before you spend.
How long do RV absorption fridges last? Kept level and cared for, a cooling unit often runs 10 to 18 years. Heat abuse from running off-level or with blocked vents cuts that fast.