Forest River Arctic Wolf – RV Water Heater Thermostat and Heating Element Replacement

RV Water Heater Thermostat and Heating Element Replacement

I’ve got a small cardboard box wedged behind my tool cabinet in the cargo van — labeled in Sharpie with “Arctic Wolf repeats.” Inside are four heating elements and three thermostats, all Forest River originals. That box exists because the water heater on these rigs fails the same way almost every single time, and I’ve stopped bothering to source parts from the supplier when I roll up to fix one. The pattern is always identical: owner reports no hot water on electric mode, blames the RV for a week, then calls. I pop the access panel, run the meter, and ninety percent of the time it’s either a corroded element or a thermostat that’s lost continuity. Replacing both components is straightforward work if you know what you’re testing for and how to seal the new element properly — I’ve done enough of these repairs that I can walk through the whole job while standing in someone’s driveway without opening the manual. This guide covers exactly what I check, why I check it that way, and how I get these two parts swapped without leaks or wiring mistakes.

Parts Needed:

• Suburban 232306 Thermostat Switch, Model: 232306, Outdoor&Repair Store (Part Number: 232306) ($18.99)
• Upgraded 520900 RV Water Heater Element For Suburban RV SW Series Electric Wa… (Part Number: 520900) ($17.00)
• Lrichy 110V/120V RV Water Heater Screw-In Electric Heating Element 110V/1400W… (Part Number: Replaces Suburban 520789/520900 • Atwood/Dometic 92249) ($21.97)
• VOTMELL 4 Rolls 1/2 Inch(W) X 520 Inches(L) Teflon Plumbers Tape,Pipe Sealing… ($3.59 ($0.90 / count))
• Nextronics Tool-Free Wire Connectors 25 Pieces – Quick Splice Terminal Blocks… ($8.99 ($0.36 / count))
• Suburban 232767 Water Heater Anode Rod (Part Number: 232767) ($25.99)

After years on the road, I’ve learned that a bad thermostat is one of the sneakiest culprits behind a water heater that won’t fire up on electric mode — and having the right replacement on hand saves you days of cold showers at a campsite. The Suburban 232306 Thermostat Switch is an OEM-spec part, which matters because aftermarket thermostats can have inconsistent calibration that leaves you chasing a problem you thought you already fixed. Swap it straight in, no modification needed.

I keep a spare heating element in my basement storage because this is exactly the kind of repair that catches you off guard on a Friday night. The Upgraded 520900 RV Water Heater Element for Suburban SW Series is purpose-built for these units, so fitment is reliable and you’re not guessing at wattage ratings. One thing I always stress — flush your tank and make absolutely sure the element is fully submerged before energizing it, or you’ll burn out a brand-new element in minutes. That’s an expensive and avoidable mistake.

If the OEM-spec element is backordered or you want a solid budget-friendly option that still gets the job done right, the Lrichy 110V/1400W Screw-In Electric Heating Element is worth considering as a secondary pick. It’s rated at the correct voltage and wattage for 110V RV systems and uses a standard screw-in design that fits most Suburban tanks. Just double-check your thread pitch before ordering, apply fresh thread tape on installation, and torque it snug — not gorilla tight — to avoid cracking the tank fitting.

Step 1: Testing and Removing Failed Components

Start by testing the heating element to confirm whether it’s actually the source of your hot water loss. Turn off all power to the water heater and drain the tank completely — disconnect the low-point drain valve at the bottom of the tank and let the water run until it stops. Once you’re certain it’s drained, locate the heating element’s power terminals and carefully disconnect one of the wires. Switch your digital multimeter to ohm mode (resistance setting). Touch one probe to each terminal of the heating element and read the display. A working element typically shows between 8 and 15 ohms on the meter — closer to 10 or 12 is normal. If your meter shows “OL” (which means overload or infinite resistance), the element has failed internally and needs replacement. Any resistance reading far outside that 8–15 ohm window is also a sign of failure.

Once you’ve confirmed the element is bad, remove it from the tank. Grab the correct wrench size — usually 1-1/8″ or 1-1/16″ depending on your Arctic Wolf’s year — and turn the element counterclockwise slowly and steadily. Don’t jerk it; these threads need respect. You’ll probably see a trickle of water come out when the element breaks the seal, even though you drained the tank. That’s normal. The element will slide out along with its rubber gasket. Before you toss either one, look closely at that gasket for cracks, flat spots, or deterioration. Keep the old gasket nearby as a reference for size. Check the failed element itself too — you’ll usually spot scale buildup, rust stains, or visible damage to the heating coil inside that confirms why it stopped working.

Now test the thermostat switch to see if it’s also failed. You’ll find two thermostat switches mounted near the top of the water heater — the one with the wider flat conductor handles the 12V propane circuit, and the thinner wire one controls the 120V electric system. Since you’re troubleshooting electric mode, focus on the electric thermostat. Remove its rubber protective cap so you can see the reset button underneath. Inspect the wires running to it for any signs of heat stress — discolored insulation, melted wire coating, blackened terminals, or connections that have come loose. Disconnect the two power wires from the thermostat’s bottom terminals carefully. Set your multimeter to continuity mode or very low resistance.

Touch each probe to one thermostat terminal. A functioning switch displays continuity — nearly zero ohms — when the water is at room temperature. If it shows no continuity at all, or if the wiring shows heat damage, replacement is the only fix.

Step 2: Installing New Components and Testing

Install the new heating element with a proper seal so you don’t spring a leak the moment you pressurize the system. First, clean out the threaded hole in the water heater tank — scrub away any leftover gasket bits, mineral deposits, or rust using a clean cloth and some mild detergent if needed. Grab your new element and the gasket that came with it (or buy a fresh gasket if the element didn’t include one). Thread the gasket onto the element’s threads, positioning it flush against the element’s flange. Now hand-thread the new element into the tank opening by turning clockwise. Get it as tight as you can with just your hand. Once it won’t turn by hand anymore, pick up the wrench and give it an additional 1/4 to 1/2 turn — no more than that. Over-tightening cracks the porcelain tank lining or deforms the gasket seal.

Connect the wires to your new heating element following the original configuration. Find the two terminal posts on the new element. The hot wire from your RV’s power system (usually black or red) goes to one terminal, and the ground wire (white or green) goes to the other. Heating elements aren’t polarized — either wire can technically go on either post — but match the original installation pattern to stay consistent. Use wire nuts or crimp connectors rated for outdoor and moisture-exposed locations. Tighten each connection firmly. Wrap electrical tape around both connections for extra moisture protection, making sure no bare copper wire is visible and nothing can accidentally short against the metal tank housing.

If you’re also replacing the thermostat, remove the old one first by disconnecting all its wires and unscrewing the two mounting bolts that hold it to the bracket. Position the new thermostat in the exact same spot and angle as the original — proper mounting position is critical for accurate temperature sensing. Screw it down securely until it sits flush. Reconnect the wires to the new thermostat the same way they connected to the old unit — snap a quick phone photo of the old terminals before you pull the wires off if you’re uncertain of the arrangement. One wire carries power from your RV’s circuit breaker, and the other leads to the heating element. Tighten these connections well and cover them with electrical tape. Cap the reset button back up with its rubber cover.

Now run a complete system test before you declare the job done. Close and tighten the low-point drain valve at the tank bottom. Switch on the RV’s fresh water supply and crack open a hot water faucet inside to let air escape. Run water until it flows smooth and steady without bubbles — that means the tank is full and all the air is out. Turn the faucet off and visually inspect the new element and all wire connections for any wet spots or drips. Flip on the water heater’s circuit breaker. Using your multimeter set to AC voltage, carefully touch the probes to the heating element terminals and confirm you’re reading right around 120 volts (110–125V is the acceptable range). Switch on the water heater from the interior control panel. A 6-gallon tank takes roughly 30–45 minutes to heat; a 10-gallon unit takes 45–60 minutes. Go test a hot water faucet to verify the system is actually producing heat. During that first heating cycle, stay nearby and listen for any odd noises, smell for burning plastic or electrical smells, and watch for leaks.

The Suburban 232306 Thermostat That Actually Holds Temperature in a Forest River Arctic Wolf

When your Arctic Wolf’s water heater cycles erratically or struggles to reach your set temperature, nine times out of ten the thermostat switch has gone bad — and the Suburban 232306 is the OEM part that puts an end to the guessing game. This switch tells the heating element when to turn on and off, and a failed one leaves you without hot water in the middle of nowhere.

What works

• Factory fit for your specific Arctic Wolf year and model — no cross-referencing part numbers or second-guessing whether you ordered the right switch.
• Temperature stability after installation; the water stays hot once it reaches setpoint instead of swinging between scalding and lukewarm.
• Clear diagnostic results — if you install this and the heater still won’t work, you’ve narrowed the problem down to the element or the circuit wiring, not the thermostat.

What doesn’t

• Some online retailers occasionally ship the wrong revision number — double-check that your 232306 matches the part number stamped on your water heater’s label before you break out the tools.
• Getting to it requires a tank drain and system depressurization first; this isn’t a fast swap if you’ve never accessed the thermostat before.

I second-guessed whether I’d diagnosed the thermostat correctly until I swapped it and watched the element fire solid for the first time in weeks—no cycling, no cold spots. Get the Suburban 232306 on Amazon

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