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How To Troubleshoot A Hayward Pool Heater: Most Common Issues, Error Codes & Solutions

how to troubleshoot a hayward pool heater

Pool heaters are an essential part of any swimming pool owner’s life. They provide warmth and comfort for swimmers and guests alike.

However, there are times when your pool heater may malfunction or stop working altogether.

Here are some tips to help you troubleshoot a Hayward pool heater if you are in such a situation. 

Note: Most of these steps will apply if you own a different brand.

Before You Blame Your Pool Heater...

Checking the Pool Heater Circuit Breaker

First, turn off the power to the pool heater circuit breaker. This should immediately shut down the pool heater. If the circuit breaker does not shut off, you should call a professional service technician to come out and inspect the problem.

Next, check the fuse box located near the pool pump. The fuses should be in good condition. If one of the fuses has blown, replace it.

Check the Pool Heater Thermostat

Next, check the thermostat. If the temperature setting is set too low, the pool heater will not run properly. On the other hand, if the temperature setting matches the current temperature inside the pool, then the thermostat is functioning correctly.

Check the Pool Pump

Finally, check the pool pump. If the pump is running, then the water flow is normal. If the pump is not running, you need to contact a professional service technician to fix the issue.

Most Common Problems With Hayward Pool Heater

how to troubleshoot a hayward pool heater

Hayward pool heaters can experience numerous problems. Here are some of the more common issues with pool heaters:

Pool Heaters Not Working

If your pool heater isn’t producing heat, then the pool heater probably needs to be fixed. But, first, contact a professional service technician to have them look at the pool heater.

Pool Heater Leaks

Leaks are very common with pool heaters. If you notice any leaks around the pool heater, you must get them fixed immediately.

Pool Heater Won’t Heat Up.

This is another common problem with pool heaters. You need to ensure that the pool heater receives enough voltage from the electrical outlet. If the pool heater is getting too little electricity, you need to increase the amount of electricity sent to the pool heater.

Hayward Pool Heater Replacement Cost

how to troubleshoot a hayward pool heater

Replacing a pool heater can cost anywhere between $250 – $1000, depending on how old the pool heater is. Most new pool heaters start at about $500.

However, if you want to save money by purchasing an older model pool heater, you can find used pool heaters for as cheap as $200.

Fixing A Hayward Pool Heater: Most Common Repairs

how to troubleshoot a hayward pool heater

There are many different ways to repair a pool heater. Here are the most common items needing attention:

1. Replace the Pool Heater Coil

A pool heater coil is the essential component of a pool heater. It provides heat to the water in the pool. If the pool heater coil breaks, the pool heater will no longer produce heat. In this case, you must replace the pool heater coil.

2. Replace the Pool Heater Motor

The motor is responsible for turning the pool heater on and off. If the motor is not working properly, the pool heater cannot operate. In this case, the pool heater needs to be replaced.

3. Repair the Pool Heater Fuse Box

If the pool heater fuse box is damaged, then the pool heater won’t function properly. In this case, a professional service technician must repair the fuse box.

4. Repair the Pool Heating System

The entire pool heater must be repaired if the pool heating system is damaged. A professional service technician is recommended to perform the repairs in this case.

How to Maintain a Hayward Pool Heater (So You Won't Need It Repaired)

how to troubleshoot a hayward pool heater

Maintaining a pool heater properly will help prevent future problems.

Here are some tips to keep in mind when maintaining a pool heater:

Clean The Filter Regularly

You should clean the filter every month or so. This helps remove debris from the water.

Check The Pool Pump And Water Level

You should check the pool pump and water level regularly. These two components work together to ensure that the pool heater operates correctly.

Change The Filters Every Year

It is recommended that you change the water filters every year. Changing the filters ensures that they are performing their job properly.

Use The Right Size Of Pool Heater For Your Pool

It is essential to use the correct pool heater size for your pool.

Using a larger-sized pool heater than needed could lead to overheating.

On the other hand, using a smaller-sized pool heater than needed might cause the pool heater to run inefficiently.

Inspect The Pool Heater Once Per Month

Make sure that you inspect the pool heater once per month.

Then, you can catch any potential problems before they become significant issues.

How Do I Reset My Hayward Pool Heater?

how to troubleshoot a hayward pool heater

You can reset a pool heater from the circuit breaker or control panel. This way, you do not have to call a technician to fix anything.

The control panel and keypad offer the same functionality; however, the keypad works better because there is no chance of making mistakes.

You need to press the control panel’s reset button to do this. Once you do, wait for about five minutes before turning the power supply back on again.

When you turn off the power supply, you will see a flashing red light.

After three seconds, the flashing red light turns green.

Then, you can turn the power supply back on.

Hayward Pool Heaters: Common Error Codes

how to troubleshoot a hayward pool heater

bD - Gas valve error

This code means there is something wrong with the gas valve. The gas valve could be stuck closed, causing no heat output whatsoever.

This may happen because of corrosion, dirt buildup, or debris entering the valve. To check the gas valve, turn off the power, open the cover and look inside the valve.

You’ll see the valve stem sticking out of the housing. Remove the valve cap and clean the valve stem. Then replace the valve cap and reattach the power cord. Turn the power back on and test again. If the problem persists, contact a pro.

HF - Flame is sensed, but the gas valve is OFF

The flame sensor detects whether the burner is operating properly. If the flame isn’t burning brightly enough, the gas valve won’t operate. Check the flame sensor itself first.

Is it plugged in correctly? Does it work when the power is turned on? Is the battery fully charged?

PF - Electrical supply wiring error

The pool heater won’t function properly if the electrical supply wiring is faulty. The electric wires must pass through the wall outlet box. Ensure the wire connectors are securely attached to the wires and that the wires are firmly secured within the outlet box.

Also, make sure the breaker panel is set up correctly. If you notice loose connections, tighten them immediately.


Q: How Long Does It Take For Pool Heater To Work?

A pool heater usually takes 1-2 hours to work after it has been turned on. You should then wait 2-4 hours before using the pool.

Q: What Is The Best Way To Clean My Pool Heater?

You don’t need to clean your pool heater every week.  Once or twice a season should be fine unless you have hard water issues that could cause premature mineral buildup.

Q: How Do I Know When My Pool Heater Needs to be Replaced?

You should check your pool heater once a month in-season to see if it needs replacing. Look for signs of rusting, leaking, or other damage.

Q: How Long Do Pool Heaters Last?

Pool heaters last anywhere from 5-10 years. Some pool heaters even last up to 15 years or more!

Q: Can I Leave Pool Heater On All The Time?

It’s not advisable to leave your pool heater on all night long. Apart from the huge waste of resources, you will also stress out its components unnecessarily and cause potential damage. Cycle it several hours before you plan to use it, or cycle it during midday if you want to swim in the evening after work.

Q: How Often Should I Change The Pool Filter To Protect My Pool Heater?

You should change or clean your pool filter every 3 months to keep your pool heater in good shape.

Q: What Is The Best Way To Clean A Pool That Uses A Heater?

There are several different ways to clean your pool. One of the easiest ways to clean your pool is to use a chlorine tablet. Chlorine tablets kill bacteria and algae. They also help keep your pool looking great.

Q: Can I Use Salt In My Pool?

Yes, you can use salt in your pool. However, you must ensure that you add the right amount of salt. Too much salt will leave your pool feeling like a swimming pool.

Q: Why Are There Different Types Of Pool Heaters?

There are many types of pool heaters available today. Each type of pool heater has its own advantages and disadvantages.

Q: What Type Of Pool Heater Should I Buy?

The best way to decide which type of pool heater to buy is by considering what features you want in a pool heater.

Q. How Much Does A Pool Heater Cost?

A pool heater costs anywhere from $200-$1000, depending on how big it is. If you have a small pool, then you probably won’t need a very expensive pool heater.

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