DIY Error Codes

Jandy JXi gas pool heater Fault CHECK IGN CONTROL

The heater tried to light 3 times and failed, so it stopped. Jandy says it retries on its own after one hour.

Check the clearances and the flue outlet for blockage, then reset once. If CHECK IGN CONTROL returns, call a qualified technician.

Start the fix →When to call a pro ↓
Full answer & models

Jandy JXi CHECK IGN CONTROL means the heater failed to light after 3 tries. Check clearances and the flue outlet, reset once, and call a pro if it returns.

Applies to: JXi 200JXi 260JXi 400
Also searched as: Jandy heater FAULT-CHECK IGN CONTROL, Jandy JXi check ign, Jandy heater fault check ign, Jandy pool heater check ignition control, Jandy JXi ignition fault

Gas appliance. Owner checks only; Jandy says a qualified professional service technician must do all service.
Why
Jandy, what to do if you smell gas: immediately switch off main gas supply; do not try to light any appliance; do not touch any electrical switch; do not use any phone in your building; immediately call your gas supplier from a neighbor's phone and follow the gas supplier's instructions; if you cannot reach your gas supplier, call the fire department. Installation and service must be performed by a qualified installer, service agency or the gas supplier. Jandy: ELECTRICAL SHOCK HAZARD. This heater contains wiring that carries high voltage. Contact with these wires may result in severe injury or death. Jandy servicing safety: service procedures can be hazardous because they involve fuel gas, electricity, moving parts and procedures which require testing or temporary bypass of safety controls, so the heater must be serviced only by a qualified professional service technician. Improper installation or maintenance can cause nausea or asphyxiation from carbon monoxide in flue gases which could result in severe injury, or death.

What CHECK IGN means

The heater tried to light 3 times and failed, so it stopped. Jandy says it retries on its own after one hour.

More detail
Jandy's JXi manual (Section 10.2, Service Diagnostic Messages, p. 47) lists "FAULT-CHECK IGN CONTROL" with these possible causes: broken, split, pinched or disconnected air pressure switch tubing; fan not operating, running slow or failed early; air flow restricted at the intake or discharge; broken igniter; low gas supply pressure/volume; or no flame at the burner. Section 1.8 (p. 7) says that if a total of 3 ignition attempts fail, an ignition fault is displayed.

5-minute checks

Fix it step by step

Step 1 of 4

  1. Check clearances and ventilation

    • 5 min
    • None
    • Caution

    Safety: Gas appliance. Owner checks only; Jandy says a qualified professional service technician must do all service.

    A listed Jandy remedy you can check by eye.

    More detail

    Check clearances and ventilation.

    Jandy remedy (p. 47): check for proper clearances around the heater and for adequate room ventilation if enclosed. Look only. Jandy: improper maintenance can cause asphyxiation from carbon monoxide in flue gases. Do not take the vent apart.

    Did the code clear?

  2. Look for blockage at the flue outlet

    • 5 min
    • None
    • Caution

    Safety: Gas appliance. Owner checks only; Jandy says a qualified professional service technician must do all service.

    Jandy: inspect for blockage at the discharge of the flue.

    More detail

    Look for blockage at the flue outlet.

    Jandy remedy (p. 47): inspect for blockage or restriction at the discharge of the flue. Look from a safe distance; do not touch the vent while the heater has been running. Look only. Jandy: improper maintenance can cause asphyxiation from carbon monoxide in flue gases. Do not take the vent apart.

    Did the code clear?

  3. Reset the heater once

    • 2 min
    • None
    • Caution

    Safety: Gas appliance. Owner checks only; Jandy says a qualified professional service technician must do all service.

    Jandy's reset gives the heater 3 new tries.

    More detail

    Reset the heater once.

    Jandy Section 8.2.2 If Ignition Is Unsuccessful (p. 39): after three failed attempts the system shuts down and will automatically attempt to restart after one hour. To reset the heater to provide three attempts to start, turn OFF the control, then turn it back ON, and access either the Pool or Spa mode. Jandy (p. 38): before operating, smell all around the appliance for gas, including next to the floor. If you smell gas, do not reset.

    Did the code clear?

  4. Call a qualified service technician

    • Decision
    • None
    • Pro decision

    Stop here and book a qualified technician.

    More detail

    Call a qualified service technician.

    The other remedies Jandy lists (p. 47) are technician work: checking and replacing the air pressure switch tubing, fan or igniter, verifying 120 VAC or 240 VAC wiring, checking the ignition control LED codes, checking gas supply pressure and the gas line, and correcting loose wiring or problems with the igniter, gas valve or ignition control. Jandy (Section 11, p. 48): call a qualified service technician to perform all service and repairs on the heater. Do not open the heater cabinet yourself.

    Still showing CHECK IGN?Need a pro → call a pro

Code cleared. Nice work.

Watch the display for a day to make sure it stays clear.

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Fixed after any step? Watch the display for a day to make sure it stays clear. Still CHECK IGN after step 4? call a pro.

Call a pro if…

  • You smell gas (switch off the main gas supply if you can, then call your gas supplier from a neighbor's phone).
  • CHECK IGN CONTROL keeps coming back after the owner checks.
  • Anything that needs the heater cabinet opened, wiring checked, or gas pressure tested.

FAQ

What does CHECK IGN CONTROL mean on a Jandy JXi?

An ignition fault. Jandy's manual (p. 7) says the fault shows when a total of 3 ignition attempts fail. Listed causes include air pressure switch tubing problems, fan problems, restricted air flow, a broken igniter, low gas supply and no flame at the burner (p. 47).

How do I reset a Jandy JXi after an ignition fault?

Per Section 8.2.2 (p. 39): turn OFF the control, turn it back ON, and select Pool or Spa mode. That gives the heater three new attempts. It also retries on its own after one hour. If the fault keeps returning, call a qualified technician.

What is the flashing LED inside the heater?

Jandy's ignition control has an LED that flashes service codes; a triple flash means ignition lockout after three unsuccessful attempts (Section 10.3, p. 48). It is inside the heater, so leave reading it to a technician.

Source: Jandy JXi Gas-Fired Pool and Spa Heater Installation & Operation Manual (H0574300 Rev M), Section 10.2 Service Diagnostic Messages (p. 47); Section 1.8 (p. 7); Section 8.2.2 (p. 39); Section 10.3 (p. 48); safety, pp. 1, 32, 38 and 48. Written by the DIY Error Codes team. Updated 2026-10-16. DIY Error Codes is independent and not affiliated with or endorsed by Jandy.