Jandy Pool Heater Error Code 11: How to Fix It

Medium 30-60 minutes Medium Severity Verified June 2026
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Error Code
11
Brand
Jandy
Product Type
pool_equipment
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
30-60 minutes
Jandy pool heater error code 11 indicates an air flow switch problem, meaning the heater's air pressure switch is not closing properly. This usually points to a blocked exhaust, faulty switch, or draft issues. Follow these steps to diagnose and fix the issue.
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Tools You'll Need

How to Fix Error Code 11

  1. Safety First: Power Down the Heater

    Always disconnect power and gas before servicing.

  2. Inspect the Exhaust Vent

    Wear gloves and eye protection when handling debris.

  3. Check the Air Pressure Switch Hose

  4. Test the Air Pressure Switch

    Only use a multimeter if you are comfortable with electrical testing. Otherwise, skip to step 5.

  5. Clean or Replace the Air Pressure Switch

    Use caution when handling electrical components.

  6. Restore Power and Test

Parts You May Need

Air pressure switch
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Rubber hose (if needed)
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Air pressure switch
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Rubber hose (if needed)
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Air pressure switch
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Rubber hose (if needed)
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Air pressure switch
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Rubber hose (if needed)
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When to Call a Professional

If you suspect a gas leak, the heater still fails after switch replacement, or you're uncomfortable with electrical or gas components, call a licensed pool heater technician.

Frequently Asked Questions

What does error code 11 mean on a Jandy pool heater?
Error code 11 indicates an air flow switch problem. The air pressure switch is not closing, which can be caused by a blocked vent, faulty switch, or draft issues.
How do I reset a Jandy pool heater error code 11?
First, turn off the heater and disconnect power for 30 seconds. Then restore power. If the error persists, follow the troubleshooting steps above to clear the blockage or replace the switch.
Can I bypass the air pressure switch on a Jandy heater?
No, bypassing the switch is dangerous and can cause carbon monoxide buildup or fire. Always replace a faulty switch with an identical part.
Where is the air pressure switch located on a Jandy pool heater?
It is typically located inside the heater cabinet, near the blower or exhaust manifold. It has a rubber hose connected to it.
How much does it cost to fix error code 11 on a Jandy pool heater?
If you DIY, a replacement air pressure switch costs $20-$50. Professional service including diagnosis and repair can range from $150-$300.

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