Keystone Arcadia – RV Water Heater Thermostat and Heating Element Replacement

RV Water Heater Thermostat and Heating Element Replacement

A shop quote landed in my inbox last week: $480 in labor alone to pull and replace a water heater element on a Keystone Arcadia, plus another $120 for the part itself. That’s $600 for work that takes me 90 minutes flat — and the difference isn’t that I’m faster, it’s that I’ve already diagnosed exactly what’s failing before I even touch the unit. On a rig like the Keystone Arcadia, a dead heating element or a thermostat that’s lost its mind shows up with zero hot water and a reset button that won’t hold, and I’ve seen it enough times to know the fix cold. The trap most owners fall into is guessing wrong about which component failed, swapping both parts unnecessarily, or worse — firing up a heating element in a tank that’s already bone dry, which turns a $150 repair into a fire hazard and a total rewrite of your trip. This walkthrough covers exactly what I do on the job: how to test before you replace anything, how to pull the bad parts safely, and how to wire the new ones so they actually stay fixed.

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)

When my Keystone Arcadia’s hot water started running cold, the thermostat switch was the first thing I checked — and nine times out of ten, that’s your culprit. I always reach for the Suburban 232306 Thermostat Switch because it’s a direct OEM-style replacement that drops in without any wiring gymnastics. The fit is exact, the contacts are solid, and I’ve never had a callback issue after installing one. Just make sure you drain the tank and cut power before you touch anything.

If the thermostat checks out fine and you’re still getting lukewarm water, the heating element is almost certainly toast — especially if you’ve been running on electric hookups for a few seasons. The Upgraded 520900 Suburban SW Series Heating Element is the one I trust here. It’s built to match Suburban’s SW-series specs and the upgraded construction holds up better against mineral buildup than the stock element ever did. Wrap the threads with fresh Teflon tape, torque it down snug but not savage, and you’re good to go.

On a tight budget or can’t get the OEM part shipped fast enough? I’ve used the Lrichy 110V/1400W Screw-In Heating Element as a solid backup option, and it’s held up surprisingly well. It pulls the same 1400W at 110V/120V, so the math works out right for Suburban tanks. The one thing I’ll warn you about — double-check the thread pitch before you commit to installation. It fits most SW-series tanks, but confirm your model number first so you’re not chasing a leak at 2 a.m. in a campground with no parts store nearby.

Step 1: Testing and Removing Failed Components

Start by testing the heating element to figure out whether replacement is actually necessary. After power is off and the water heater tank has been completely drained, disconnect one wire from the heating element’s power terminal. Switch your digital multimeter to resistance (ohms) mode. Touch one probe to each of the heating element’s terminals. A working heating element will display a resistance value somewhere in the 8-15 ohm band, usually hovering around 10-12 ohms on a standard RV water heater element. If your meter reads “OL” (overload) or shows infinite resistance, the heating element is dead and needs to come out. Any resistance reading that’s far outside that 8-15 ohm window points to a failed element as well.

Once you’ve confirmed the heating element is bad, go ahead and remove it. Grab the right wrench size for your model (usually 1-1/8″ or 1-1/16″), and unscrew the element counterclockwise from the tank opening. Move slowly and steadily — you might see a little water dribble out even though you already drained the tank, and that’s perfectly normal. The element will come free along with its rubber gasket. Take a close look at that gasket for cracks, wear marks, or places where it’s been permanently squashed flat. Hold onto the old gasket temporarily so you’ve got a size reference, even if you’re definitely replacing the element. Look over the element itself too — scale deposits, rust spots, or visible breaks in the coil all confirm it’s time for a new one.

Now test the thermostat to see if it’s also ready to be swapped out. Find the two thermostat switches positioned near the top of the water heater assembly — one of them controls the 12V propane burner (you’ll spot it by the wide flat conductor) and the other controls the 120V electric element (that one’s got a thinner wire). For electric heating problems, focus on the 120V thermostat. Peel back the rubber cap that covers the reset button. Look at the wiring connections closely for any heat damage: discolored insulation, melted plastic around the wires, blackened terminals, or any connections that have come loose. Disconnect the two power wires from the thermostat’s bottom terminals. Flip your multimeter to continuity mode or low resistance.

Place your meter probes on the thermostat terminals — at normal temperature, continuity should show up as close to zero ohms. If you’re seeing no continuity, or if the wiring itself looks burned or heat-damaged, the thermostat is done and needs replacement.

Step 2: Installing New Components and Testing

Put the new heating element in place using the right sealing method. First, wipe out the threaded opening in the water heater tank completely — use a clean rag to remove any leftover gasket material, mineral crusting, or corrosion buildup. Grab your new heating element and gasket (or pick up a fresh gasket separately if it didn’t come with the element). Slide the gasket onto the element’s threads so it sits right up against the flange. Start threading the new element into the tank opening by hand, turning clockwise. Get it hand-tight before you even pick up the wrench. Once it feels snug by hand, use the wrench to turn it another 1/4 to 1/2 turn — stop there and don’t crank harder, because overtightening will trash the gasket or crack the porcelain tank lining.

The element should feel solid and the gasket should seal completely all the way around. Wire up the new heating element exactly by the book. Find the two terminal posts on the element. Take the hot wire (usually black or red) from your RV’s electrical system and attach it to one terminal, then connect the ground wire (white or green) to the other. Most heating elements aren’t polarized, so either wire works on either post in a technical sense. That said, always match whatever configuration the original installation used. Crimp connectors or wire nuts rated for wet/outdoor use are your friend here. Make sure every connection is pulled tight. Wrap each one with electrical tape to keep moisture out.

Verify that no bare copper is showing anywhere and that wires can’t accidentally touch the metal water heater housing and short out. If you’re swapping the thermostat too, do it carefully and reconnect everything right. Remove the old thermostat by taking off the wires and unbolting it — usually two screws holding it to the bracket. Position the new thermostat in exactly the same spot and angle as the one you pulled out. Use those mounting screws to lock it down flush against its mounting surface — good contact is what lets it sense temperature accurately. Hook the wires back up to the new thermostat terminals the same way they were connected to the old one. Snap a quick photo of the old thermostat’s wire connections before you unhook anything if you’re worried about getting it backwards. The hot supply wire goes to one terminal, the wire running to the heating element goes to the other. Double-check that all connections are tight and covered so nothing’s exposed. Screw the rubber cap back onto the reset button.

Run a complete system test before you pack up and move on. Tighten the drain plug at the bottom of the water heater tank snugly with your wrench. Open the fresh water supply in the RV and turn on a hot water faucet inside. Let water run until it comes out smooth with no air bubbles — that means the tank is full and you’ve got all the air bled out. Turn off that faucet and scan the new element and all the wire connections for leaks. Switch on the breaker that powers the water heater. Set your multimeter to AC voltage and touch the probes to the heating element terminals — you should be looking at roughly 120 volts (anywhere from 110-125V is fine). Flip on the water heater switch on the interior control panel. Give it 30-45 minutes if it’s a 6-gallon tank, or 45-60 minutes for a 10-gallon unit, to climb up to temperature. Turn on a hot water faucet and confirm you’ve got heat coming out. Watch that first heating cycle — listen for anything weird, smell for anything burnt, and keep an eye out for drips or spray.

The Suburban 232306 Thermostat — Why This Switch Ends the Broken Water Heater Cycle

The Suburban 232306 thermostat is the single weak link that sabotages water heater performance on Keystone Arcadias and dozens of other floor plans in that family. Lose this component and temperature control vanishes — the element fires nonstop, breakers start tripping, or nothing heats at all.

What works

• Straight OEM replacement — it bolts into the exact same spot where the dead thermostat sat, zero adapter fussing or rewiring from scratch.
• Temperature stays put where you set it; the element now cycles the way it should, powering up and down instead of running wide open then cutting off completely.
• Stops the electrical chaos — those random breaker shutdowns when the water heater should be sitting idle vanish completely.

What doesn’t

• The two-day shipping promise doesn’t apply here — real-world delivery is 7-10 days, and if your rig breaks Friday afternoon, you’re without heat through Monday at the earliest.
• Corrosion builds up fast on those switch terminals if the water heater sat dormant; you may need to clean the connectors or re-crimp them during install, otherwise you’ll get flaky operation down the road.

I was convinced the heating element itself was dead until I swapped the thermostat first and the whole system came back to life — caught me off guard how often techs skip this and chase the element unnecessarily. Grab the 232306 here.

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