Troubleshoot Fast: Common Hayward Pool Heater Error Codes Explained

Diving into the world of Hayward pool heaters, you’ll find that they’re reliable companions for your swimming comfort. But like any complex machinery, they may occasionally flash error codes that can leave you puzzled. Understanding these error codes is crucial to maintaining your pool’s perfect temperature and ensuring a quick fix to common issues.

This article will decode the mystery behind Hayward pool heater error codes. You’ll learn what each code means and how you can troubleshoot them effectively. Whether you’re facing an IF code indicating ignition failure or an LO code pointing to insufficient water flow, you’ll be equipped to handle it with ease. Keep reading to transform yourself into a pool heater problem-solving pro.

What Are Hayward Pool Heater Error Codes?

Hayward pool heater error codes are diagnostic alerts that your pool heater generates when it encounters a problem. These alphanumeric messages are your heater’s way of telling you something is amiss. Recognising these error codes is crucial because they offer the first clue in troubleshooting and maintaining an efficient pool heating system.

  • LO: Indicates low water flow, a common issue that could be due to a clogged filter or a closed valve.
  • IF: Refers to ignition failure, which occurs when the heater fails to light, often due to gas supply problems or faulty ignition components.
  • HS: Signals high-limit switch activation, a safety feature that triggers when water temperature exceeds safe levels.

Understanding Hayward pool heater error codes ensures you’re promptly aware of issues that could escalate into costly repairs. They are designed to protect both your comfort and your pool equipment. It’s crucial to address these alerts immediately, as ignoring them can lead to more significant problems, including damage to your pool heater and even potential safety hazards.

By familiarising yourself with these codes, you’ll be equipped to communicate effectively with technicians and potentially resolve some issues without professional help. Regular maintenance of your pool heater can prevent many of these errors, but when they do arise, a quick response is paramount. Armed with this knowledge, you’re on your way to prolonging the life of your pool heating system and ensuring it operates at peak performance.

Understanding the Importance of Error Codes

Grasping the significance of error codes on your Hayward pool heater isn’t merely about tackling current problems – it’s a proactive measure to maintain optimum performance and ensure the safety of your heater. When an error code flashes, it’s alerting you to specific issues that need your attention.

  • Economic Efficiency
    When you respond to error codes quickly, you dodge the bullet of hefty repair bills. Consider the code ‘LO’ which signals low water flow. Neglecting this could strain the heater, leading to a breakdown.
  • Safety Measures
    Codes like ‘IF’, indicating ignition failure, are a nod to possible safety hazards. Timely actions can prevent dangerous situations, such as gas leaks or fire risks.
  • DIY Troubleshooting
    Some codes offer you an opportunity for quick fixes without reaching for your wallet. The ‘HS’ code, which stands for high limit switch error, could be resolved simply by resetting the heater.
  • Long-term Durability
    Ignoring error codes is akin to ignoring the ‘check engine’ light in your car – it’s a fast track to wear and tear. Addressing these codes can prolong the lifespan of your heater, saving you the cost and hassle of premature replacement.

Addressing an error code like ‘LO’ can often be as simple as cleaning out the pool filter or checking water levels – tasks you can manage on your own. Conversely, more complex codes such as ‘IF’ may require professional assessment. By keeping an eye on these codes and understanding what they represent, you’re placing yourself in a pivotal position to keep your pool heater in top shape.

Common Hayward Pool Heater Error Codes

When maintaining your Hayward pool heater, you’ll encounter various error codes. Recognising and understanding these codes is key to keeping your heater operational. Here’s a rundown of the most frequent ones you might see displayed on your heater’s panel:

  • IF Code: This indicates ignition failure. Your heater attempted to ignite but was unsuccessful after several tries. Check for:
  • LO Code: Signifying inadequate water flow. This is a safety alert. To address it:
  • HS and LS Codes: High limit switch or low limit switch errors. These are critical safety alerts related to the water temperature within the heater exceeding or dropping below safe operating levels. Actions to take include:
  • CE Code: Communication error. There’s a problem with the connection between the control module and the rest of the heater. Often solved by:
  • AO Code: Blower switch alert. If the blower’s not working correctly, this error will display. Look at:
Error Code Meaning Quick Fixes
IF Ignition Failure Check gas, venting, flame sensor
LO Low Water Flow Inspect filters, pump, valves
HS/LS High/Low Limit Switch Error Verify flow, check bypass, test switches
CE Communication Error Check wires, reset power
AO Blower Switch Alert Assess blower, check for blockages

Handling these issues promptly can prevent more serious damage to your pool heater. Stay alert to the signs and you’ll be able to enjoy a well-maintained and efficiently-running pool heating system.

Troubleshooting Hayward Pool Heater Error Codes

When you’re faced with a frustrating error code on your Hayward pool heater, it’s essential to tackle the problem head-on. Here’s a straightforward guide to help you navigate through the most common issues.

Error Code: IF

The ‘Ignition Failure’ code means your heater attempted to ignite but couldn’t.

  • Ensure gas is turned on
  • Check the igniter for functionality
  • Inspect the gas valve for proper operation

Error Code: LO

A ‘Low Flow’ message could disrupt heating:

  • Verify if the pump is on
  • Clean the filter
  • Check for closed valves, and open them

Error Code: HS

‘High Limit Switch’ errors suggest an overheating issue.

  • Reduce the heater’s temperature setting
  • Make sure the heater has adequate ventilation
  • Check for water flow restrictions and remove them

Error Code: AO

‘Air Switch Open’ indicates air flow problems.

  • Inspect the air blower for obstructions
  • Confirm the air switch tubing is intact

By systematically addressing these error codes, you’ll not only restore your heater to working condition but also extend its lifespan and efficiency. Remember, regular maintenance can prevent many of these errors from occurring in the first place. Keep all vents clear, change filters as recommended, and schedule annual professional check-ups for optimal performance.

Tips for Preventing Hayward Pool Heater Error Codes

Proactive measures can keep your Hayward pool heater running smoothly, reducing the likelihood of encountering error codes. By implementing regular maintenance and monitoring, you can avoid the frustration and potential costs associated with heater malfunctions.

Regular Maintenance: Ensure your pool heater receives regular service to catch issues before they escalate.

  • Clean the Filter: A clogged filter can cause ‘Low Flow’ errors. Clean or replace your filter according to the manufacturer’s recommendations to maintain proper water flow.
  • Inspect the Ignition System: For ‘Ignition Failure’ codes, routinely check the pilot, burners, and ignition electrodes for dirt and wear.
  • Monitor Water Chemistry: Improper water balance can lead to corrosion or scaling, adversely affecting the heater’s components.
  • Air Flow Check: Keep the area around the heater clear of debris to prevent ‘Air Switch Open’ errors caused by blocked air passages.

Invest in a Water Softener: If your water supply is hard, it can contribute to the scaling of heat exchangers. A water softener can reduce mineral buildup, prolonging the life of the heater.

Professional Inspection: Have a certified technician inspect your pool heater annually. They will spot potential issues and perform complicated maintenance tasks that are not advisable to handle yourself.

By understanding what causes Hayward pool heater error codes and taking steps to prevent them, you’re positioned to enjoy a properly heated pool with fewer interruptions. Regular attention to maintenance tasks and professional inspections will contribute significantly to the longevity and efficiency of your pool heating system.


You’re now equipped with the knowledge to tackle Hayward pool heater error codes head-on. By adhering to the preventive measures outlined, you’ll minimise disruptions and maintain a comfortably heated pool. Remember, regular upkeep is key to your pool heater’s longevity. Should you encounter any errors, use the insights from this article to troubleshoot efficiently. And don’t forget, an annual check-up by a professional is your best bet to ensure your pool heater runs smoothly season after season. Keep these tips in hand, and you’ll be set for a hassle-free pool experience.