Jay Flight Heater Dead? Read the Door Badge
The Short Answer: Jayco did not stamp a “Jay Flight” water heater. SLX, Baja, and bunkhouse bays hold Suburban, Atwood/Dometic, or an RV tankless. Cold showers are bypass still in winterize, a tripped ECO, LP, 12 V, or that badge’s DSI board — not a missing Jayco part number. Smell propane, shut the bottles.
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Search Intent & The Real Problem
The decal says Jay Flight. The shower died at the first campground after a dealer winterize. 154BH, 212QBW, 224BHW, 265RLS, 28BHS, 32BHDS, 38BHDS, and the 40-foot loft floorplans do not ship a Jayco-branded vessel. I have replaced Suburban SW6DE / SW10DE Phase 3 tanks behind those square exterior doors, and Atwood/Dometic GC boxes in older years. Same industry rule as Forest River, Grand Design, and Thor Motor Coach — Jayco is a Thor Industries brand, not a Thor Motor Coach OEM tank. The door badge picks the parts.
What other guides get wrong
They sell a Jayco element kit with no Suburban or Dometic number on the bag. They start at the interior switch and never open the bay, so a three-valve bypass still in winterize gets a new board. They put a standing-pilot thermocouple on a DSI heater that has none. And they treat a 6-gallon SLX tank like a house 40-gallon flush job.
Step-by-Step Troubleshooting
Step 1: Find the bay, then read the badge — not the Jay Flight decal
| Coach family | Where I look first | What is usually behind the door |
|---|---|---|
| Jay Flight / Jay Flight SLX travel trailer | Square exterior access, often off-door or curbside near the galley | Suburban or Atwood/Dometic 6-gallon DSI |
| Jay Flight Baja / bunkhouse (28BHS, 32BHDS, 38BHDS) | Same door, sometimes a 10-gallon | Suburban SW6DE / SW10DE Phase 3 |
| Jay Flight 40LOFT and larger | Exterior bay; confirm it is not a tankless conversion | Dual-fuel tank or Girard / Truma / Furrion |
| Badge: Suburban Phase 3, SW6DE / SW10DE | That tank | Suburban gas, Phase 3, SW6DE, SW10DE, igniter |
| Badge: Atwood or Dometic | That tank | Atwood troubleshooting, clicking, electric |
| Truma AquaGo / Girard / Furrion | Tankless — no 6-gallon anode | Truma AquaGo, Girard, Suburban Nautilus |
| Push-button piezo, standing pilot | Older tank | Piezo won’t spark |
- What to look for: Model sticker on the door liner or the jacket. Photograph it. “Jayco” on the rock guard does not pick an electrode.
- Required tools: Flashlight, phone camera.
Step 2: Bypass, fill, and which fuel is actually dead
- What to look for: Dealer winterize is the usual Jay Flight callback. Three-valve bypass still in bypass / winterize means the tank never filled even though city water is live at the toilet. Open a hot faucet until you get a solid stream, no sputter, before you throw either switch. Dual-fuel: leave electric off while you diagnose gas so you do not dry-fire a ~1400 W / ~12 A element on 6 gallons.
| What works | Look at first |
|---|---|
| Electric OK, gas dead | LP, DSI/pilot, igniter, solenoid, ECO |
| Gas OK, electric dead | 120 V, ECO, element — Forest River electric pattern |
| Both dead | Empty tank, bypass, winterized, or no 12 V and no LP |
| Tankless: no tank | 12 V, LP, inlet screen, freeze lock |
- Required tools: Cabinet diagram, a hot faucet.
Do not spark a DSI on a tank you have not filled. ECO after a dry fire kills gas, electric, or both — same crime as turned on without water.
Step 3: 12-volt and LP at the heater — not a flare you crack
- What to look for: Converter on, battery not sitting at 10 V. DSI boards get stupid under ~10.5 V; rest ~12.6 V is the baseline. Interior gas switch actually on. 12 V fuse at the converter for the water-heater circuit. Bottles open, pigtail not stripped, regulator not a block of ice. Range lights and the water heater does not = problem in the bay. Nothing LP lights = supply or an auto-stop regulator after a bottle swap.
- Required tools: None on the flares. A DC meter if you are qualified.
Air after a bottle change can delay ignition. Loosening flares is how bays fill with gas. Lights then dies is fires up then goes out, not a second board.
Step 4: Click, spark, flame — decode that product
| Sound / sight | Meaning | Next |
|---|---|---|
| No click at all (DSI) | Switch, 12 V, fuse, ECO, board | Suburban RV reset if it is Suburban |
| Click, no spark at the tip | Cracked ceramic, burned lead, board | Spark test, bottles closed |
| Spark, no flame | Bottles, regulator, solenoid, spider nest | Fuel path; electrode is fine |
| Lights, then drops | Dirty rod, gap, flame sense, ECO | Clean/regap or stop cycling |
| Tankless fan, then lockout | That brand’s code | Truma / Girard path, not a thermocouple |
- What to look for: Spark gap about 1/8 in. (3 mm). Do not short the electrode “to test the board.” Do not put a Suburban 232307-class electrode on a Dometic tank.
- Required tools: Ears at the exterior door. Bottles closed for a spark-only look.
Step 5: Electric ECO, a wet bay, and when the tank is scrap
- What to look for: Shore power or generator actually on the coach. ECO on the jacket after a dry fire — fill, one reset, stop if it will not latch. Rusty Suburban steel or white crust on Atwood/Dometic aluminum, a wet bay floor, or water in the burner box is a vessel, not a Jayco “module.” Tankless units do not get a Jay Flight anode. Heat-damaged harness: licensed, not a YouTube wire nut. House-style numbers do not apply to these 6-gallon boxes — a campground pedestal is 120 V, not a 4500 W / 240 V ~18.8 A residential element.
- Required tools: 120 V confirmed dead before you open a box.
P&T on these tanks is still a relief (typical 150 psi / 210°F on many listings — confirm the door sticker). Never cap it. City water over ~80 psi without a regulator will dump the valve and then dry-fire electric if the switch is on.
When DIY Ends: Calling a Licensed Pro
Stop at a propane smell, a heat-damaged harness, gas-solenoid replacement, a board you cannot match to the door badge, an ECO that will not latch, and any delayed-ignition bang. You may fill the tank, set bypass to heat, confirm bottles and 12 V, and spark-test with fuel off. You may not loosen LP fittings or keep clicking a flooded burner. A mobile tech who stocks Suburban and Dometic beats a fifth trial in a 28BHS bay — and beats a “Jayco water heater” listing that does not exist.
Frequently Asked Questions
Q: Why is my Jayco Jay Flight water heater not working? A: Jayco did not make it. Read the exterior-door badge. Suburban, Atwood/Dometic, or an RV tankless fail on bypass, ECO, LP, DSI/igniter, or 12 V — not on a Jay Flight-branded tank.
Q: My Jay Flight has hot water on electric but not on gas. Is the tank bad? A: No. Dual-fuel Suburban and Atwood tanks are two circuits. Electric working means the tank holds water. Stay on the LP and ignition path for that badge.
Q: Where is the water heater on a Jay Flight? A: Behind a square exterior access door, often off-door or curbside near the galley. Bunkhouse floorplans keep the same bay. The Jayco decal still does not pick the part.