RV fridge not working on electric but works on propane

Common symptoms

• The fridge cools on propane, but gets warm when you plug in and turn the gas off.
• In AUTO it keeps running on propane even with shore power or the generator on.
• A Norcold display shows “no AC”, or “no AC” and then “no FL” with a beep.
• A Norcold shows “AC HE”, or a red light flashes a heater code.
• The fridge display works, so 12V is fine, but electric mode does nothing.

Quick checks before anything else

• The fridge is in AUTO (or AC), not set to gas only.
• The RV has shore power or the generator is running, and other outlets work.
• The breaker that feeds the fridge is on in the RV breaker panel.
• No GFCI outlet on the same circuit has tripped.
• The fridge cord is pushed all the way into its outlet behind the lower outside vent.
• Any code on the display is written down.

Why does an RV fridge work on propane but not electric?

An absorption fridge has two ways to heat its boiler: a propane burner and an electric heating element. The cooling unit is the same for both. So if it cools on propane, the cooling unit is fine and the problem sits on the electric side.

• Set to gas only The fridge never tries electric. The panel shows LP or GAS.
• No 120V at the outlet A tripped breaker or GFCI, no shore power, or a loose cord. Norcold shows “no AC”.
• Low AC voltage A weak pedestal or generator. Some Norcold 1200 models show “AC LO”.
• Blown AC fuse on the fridge The outlet is live, but the heater gets no power.
• Failed heating element Power reaches the fridge, but the boiler stays cold on electric.
• Control board or relay The board does not switch power to the heater. Some codes point here.

Step-by-step: RV fridge electric not working

We start with settings and the RV’s own wiring, which you can check without tools, and end with parts inside the fridge. Turn off 120V and 12V power before you touch anything behind the outside vent.

1. Check the mode On a Norcold with a display, push and release MODE to see the current mode for 10 seconds. If it says LP, push and hold MODE until “AU” shows. Norcold N61X models have a selector switch: AUTO, OFF and GAS. On Dometic DM and DMA models, AUTO is on when the AUTO lamp is lit; with it off, the fridge runs on propane only.
2. Confirm shore power Plug a lamp or phone charger into an inside outlet. If nothing in the RV has 120V, the fridge is not the problem. Our guides to an RV with no power when plugged in and a generator running with no power pick it up from there.
3. Check the breaker and GFCI Find the breaker for the fridge in the RV panel and switch it fully off, then on. If your RV has a GFCI outlet (one with TEST and RESET buttons) on the same circuit, press RESET. Norcold’s fix for “no AC” includes checking that the RV’s fuse or breaker is intact.

   

4. Test the outlet behind the fridge Open the lower outside fridge vent. The fridge plugs into a regular 3-prong outlet back there. Dometic’s installation guide places it so you can reach it through the vent door. Push the plug in all the way. Then unplug it and test the outlet with a lamp or plug-in tester, as Dometic tells owners to do. Never cut or remove the ground prong.

   

5. Look at the voltage Norcold rates its N64X and N84X fridges for 108 to 132 volts AC. A weak campground pedestal, a long extension cord, or a small generator under load can drop below that. If you have a plug-in voltage meter, check the outlet while the fridge runs. Some Norcold 1200 models show “AC LO” for low AC voltage.
6. Read the code Each Norcold family shows heater trouble a different way. N7LX, N8LX and 2118X models show “AC HE”. N7V, N8V, N7X and N8X models flash code 1 in red. On N61X models, the ON light flashes off 3 times with the GAS light on, which Norcold says means the AC heater failed and the fridge runs on propane only. Norcold sends you to a dealer for these. Our Norcold error code guide covers each family.
7. Check the AC fuse on the fridge Most fridges have their own fuse for the AC heater, in a module on the back. Dometic lists a 5 amp AC heater fuse in the power module of DM, DMA, DMR, DMC and RM1350 models. Turn the fridge off, unplug it, disconnect 12V, then remove the module cover. Norcold’s N64X and N84X wiring diagram shows an 8 amp AC fuse. If a new fuse blows again, stop: something is shorted.
8. Have the heating element tested The element is a metal rod that sits in a pocket on the boiler, under insulation. With the outlet, fuse and settings good and still no cooling on AC, the element is the next suspect. A tech checks it with a meter and power off. Swapping it means opening the boiler casing and its insulation. Dometic’s parts list for DM2652 models, for example, shows a 325 watt, 120V heater.
9. Have the board checked If the element is good, the control board or its relay may not be sending power to it. On Norcold N611v models, red with 4 flashes means an AC heater relay problem. Codes like “AC rE” mean a fault in the controls. Write down the model and serial number before you call.
10. Run on propane until it is fixed If it still cools on gas, you can keep food cold while you wait for parts. Set the fridge to gas mode. Above 5,500 feet, Norcold and Dometic say cooling on propane can drop and the burner can go out, so check on it more often.

Norcold vs Dometic: what changes on the electric side

Norcold. Larger models tell you a lot. “no AC” means the fridge sees no 120V, so look outside the fridge first. A heater code (“AC HE”, flash code 1, or the N61X triple flash) points inside it. On a 2-way model with no AC and no gas, you see “no AC” and then “no FL” with an alarm.

Dometic. DM and DMA models have no electric fault code. Their CHECK lamp is for the gas burner only, and if AC comes back while it flashes, the fridge runs on AC until you restart it. So you test the outlet, then the 5 amp fuse, then the element. RM1350 and DMR/DMC models show error codes, but none of them names the AC heater.

Fuses, heaters and boards do not swap between brands, or often between models. Read the label inside the fridge before you order. For the full system, see our RV fridge repair guide.

If it will not cool on either source, our guide to an RV fridge not cooling is the better place to start.

When to call an RV tech

• A new AC fuse on the fridge blows right away.
• The outlet is live and the fuse is good, but it still will not cool on AC.
• A Norcold heater or control code comes back after a restart.
• The heating element needs testing or replacing.
• You see burned wires, melted plastic, or a scorched outlet behind the fridge.

Common questions