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Jandy · JXi · LXi · Legacy

Jandy heater fault? Start here.

We fix Jandy JXi, LXi and Legacy heaters across Brevard County. Save the exact message, model and fuel before you reset anything.

Call (321) 536-9122 Schedule Service

Not sure of the brand? Use the general pool heater repair guide.

Jandy JXi gas pool heater with CHECK FLOW on the display and a cutaway showing the data plate inside the front panel on the front of the combustion chamber.

Know which Jandy you have

Read the model off the rating plate. Each family lights, and fails, its own way.

JXi

Models 200, 260, 400

Direct ignition with a combustion blower. The display spells out the fault.

LXi

Models 250, 400

Premix forced-draft burner. The flame itself is part of the evidence.

Legacy

LRZE and LRZM

LRZE is electronic ignition. LRZM is millivolt with a standing pilot.

Got a Jandy VersaTemp heat pump instead? It's a different machine. Tell us whether it's in Heat or Chill, whether the fan runs, and every display message.

Match the symptom to the model

A JXi code, an LXi flame and an LRZM pilot are different tests. Find your row, then call us with what you see.

You see Likely meaning What to do
JXi: CHECK FLOW The water-pressure switch is open: a stopped pump, low pump pressure, a switch fault, or a variable-speed setting that's too low. Note the pump mode, filter state, valves and code.
JXi: blower starts, then the burner drops out Stable flame wasn't proven. Three failed attempts set an ignition fault. Record the display and the LED flash count. Stop resetting.
LXi: igniter lights, but the main burners do not A gas valve not set to On, air in the gas line, or a failed gas valve. Leave the gas controls alone and call us.
LXi: flashback, lazy yellow tip, lifted flame, or yellow streak Premix combustion symptoms. Stop running the heater and call with the exact symptom.
LRZE: NO FLOW A stopped pump, low pump pressure, or a pressure-switch fault. Send us the model, code and pump state.
LRZE: FAULT-FUSELINK/FIELD A roll-out fusible-link fault or a vent-temperature-limit fault. Leave the safety circuit intact and call us.
LRZM: pilot will not hold A standing-pilot millivolt heater. Pilot, gas, flow and safety need a model-specific check. Send us the model number and pilot symptom.
AquaLink/iAquaLink shows heat scheduled, but the Jandy unit does not fire The remote command or communication may be the problem, not the heater. Save the controller wording, local display and LED pattern.
More on each Jandy family

JXi

The blower purges the combustion chamber, the hot-surface igniter heats, then the gas valve opens. After three failed attempts, the controller shows an ignition fault.

Slow heating can trace to pump runtime, heater size, plumbing, or a thermal-regulator valve. Pounding can mean low flow, a failed valve, bypass trouble, or a low pump setting.

After the burner stops, the fan can keep purging for 45 seconds. That sound alone isn't a new failure.

LXi

LXi premixes air and gas before the burner, and local fuel-gas properties can affect how it runs. Slow heating or condensing point toward combustion, gas supply, airflow, or water-flow checks.

Legacy LRZE and LRZM

LRZE can also show FAULT- HIGH LIMIT, FAULT- CHECK IGN CONTROL, or a water-sensor fault. LRZM is self-contained, with no external power.

Legacy heaters are natural draft, so vent blockage, downdraft, rollout and limit conditions are part of the check.

Found your row? Call (321) 536-9122 or schedule service. Schedule Service or call (321) 536-9122.

Jandy manuals: JXi, H0574300 · LXi, H0286900 · LRZE, H0299500 · LRZM, H0299600

How we diagnose a Jandy

  1. Confirm the family

    JXi, LXi, LRZE and LRZM don't share ignition parts. The rating plate decides which manual applies.

  2. Read the display before any reset

    CHECK FLOW, FAULT-PUMP and NO FLOW send us down different circuits.

  3. Split the controller from the heater

    An AquaLink schedule can fail while the heater is healthy. We check RS-485 communication apart from the local fault. If the automation is the fault, we fix that instead.

  4. Prove flow, then the burn

    We verify the water-pressure switch, never bypass it. Then we test the JXi, LXi or Legacy burn sequence.

Repair or replace? We decide from the model, serial number, fuel, fault, heat-exchanger condition and safe venting, never age alone. An older LRZ may be repairable. If it's time to replace, see costs and installation.

"I called Nat/Pro gas for an issue I was having with my pool heater. They called me back immediately, the tech was there the next day, the estimate was extremely reasonable. The service was then completed as scheduled and correctly. I would highly recommend Nat/Pro Gas."

David Lewis

Read customer reviews or see where we work.

Send the Jandy details

Include the JXi, LXi, LRZE, or LRZM model, exact code, fuel, and AquaLink/iAquaLink wording.

We use it to confirm we cover you in Brevard County, and whether the Club does.

Share symptoms, error codes, or recent changes if you know them.

Add one if you'd rather we reply by email.

Jandy questions

What does FAULT-PUMP mean on a Jandy JXi?

The filter pump is off while Maintain Temp mode is programmed. That can be normal in that mode. If the pump should be running, save the screen and call us.

What do three flashes mean on a Jandy heater?

Lockout. On a JXi, a triple ignition-control LED flash means three failed ignition attempts and a soft lockout. On an LXi, it means lockout after three cycles. Don't keep cycling the heater.

Does a Jandy LRZM use the same codes as a JXi?

No. LRZM is a millivolt standing-pilot heater with no external power. Tell us what the pilot, burner and flow are doing instead.

Send us the Jandy model and message

Have the model, exact message and controller screen ready. Call us, or use the form anytime.

Call (321) 536-9122 Schedule Service

or text (321) 536-9122 Include photos of the fault on the display and the rating plate.