Are you tired of dealing with a malfunctioning gas pool heater? We understand the frustration of having your pool water stay cold or encountering issues like leaks and loud noises. Gas pool heater troubleshooting can be a headache, but with the right information, you can solve common problems yourself or effectively communicate with a service technician.

Gas Pool Heater Troubleshooting List

If your pool heater isn't working properly, here are the most common problems you may encounter:

Heater won't turn on
Pilot light won't ignite
Pilot light keeps going out
Water isn't reaching desired temperature
Heater cycles on and off frequently
Heater is leaking water
Rust in the pool from the heater
Heater is making loud noises

Gas Pool Heater Won't Turn On

The most common issue is when the gas pool heater fails to start. The problem can be as simple as ensuring the power is turned on or the gas valve is open. However, if the service light is also on, it's best to call a service technician. Here are some troubleshooting steps:

Check that the heater switch and the main power supply breaker are in the ON position.

Make sure all valves, including the gas valve, gas supply valve, plumbing, and filter valves, are in the OPEN position.

Ensure that the pilot light is lit. If not, proceed to the next step.

Set the thermostat to a higher temperature than the current water temperature.

Gas Pool Heater Won't Ignite

If the pilot light of your gas pool heater won't ignite, there could be a few reasons. You can perform some basic checks, but if the problem persists, it's advisable to call a service professional. Here's what you can do:

Verify that gas is reaching the heater. Check for a closed gas line supply valve, obstructed gas line, or an empty propane supply tank.
Ensure that there is adequate air supply and venting. Clear any debris or vegetation from the air vents.
Check if the pilot light tubing or orifices are clogged. Clean them if they are obstructed by rust, dirt, insects, or vegetation.
Make sure there is no internal moisture or water that can prevent ignition and cause rust.

Pilot Light Keeps Going Out

If you manage to light the pilot light, but it goes out before heating the pool fully, there are a few possibilities. Troubleshooting this issue can be challenging if there is no apparent pattern to the extinguishing. Here's what you can try:

Ensure that the pilot light isn't affected by wind or water. Direct sprinklers and rain spouts away from the heater or use a cover to protect it from the elements.

Check if there is adequate gas supply, considering the recommendations mentioned earlier.

Test the output of the pilot light using a multimeter to determine if it's low or not powering at all.

Verify that there is no excess moisture or water within the heater.

Gas Pool Heater Cycles On and Off Frequently

When your gas pool heater frequently cycles on and off, it requires thorough investigation and troubleshooting. If accompanied by loud banging noises, the problem may be related to the heat exchanger. Here's what you can do:

Ensure that water flow is adequate and check for a malfunctioning pressure sensor. Low water pressure can result from an improperly sized pool pump, dirty filters, closed valves, or a reversed water connection.

Check the thermostat for proper calibration or consider replacing a faulty one.

Inspect the heat exchanger for lime or calcium buildup, which may require cleaning or replacement.

Water Isn't Reaching Desired Temperature

If your pool water fails to reach the desired temperature, there could be multiple factors contributing to this issue. It may require research and understanding your pool system. Here are some possible causes:

Verify that the thermostat is set correctly on the heater unit and any mobile or automated control systems.

Check if your heater has sufficient BTUs to heat your pool based on water volume and ambient air temperature.

Ensure that the gas line valve is open and unobstructed.

Determine if the high limit switch is being activated due to poor ventilation or an undersized heater.

Gas Pool Heater is Leaking Water

If you notice water around the base of your gas pool heater, it's usually a straightforward diagnosis. However, replacing the pool heat exchanger assembly can be costly. Here's what you should do:

Inspect the heat exchanger for signs of wear, damage, or looseness. If necessary, replace it, as it might have been compromised by pool chemicals or improper winterization.

Consider installing an external pool heater bypass to reduce water pressure on the heater parts, especially if excessive pressure is suspected.

Check all connections that come into contact with the water supply line for damage, including gaskets, o-rings, and drain plugs.

Note that some condensation is normal when introducing cold water to the heater.

Gas Pool Heater Banging Noise

If you hear banging noises coming from your gas pool heater, the most likely culprit is an open external water bypass that shouldn't be open during heater operation. Check if the bypass is closed to maintain proper water flow through the heat exchanger. If the overheating has caused damage, it may be necessary to replace the exchanger. Consult a qualified service technician for assistance.

Rust in the Pool from the Heater

Rust flakes in your pool water can be a sign of rust inside your gas pool heater. This typically occurs when stainless steel or titanium components deteriorate due to unbalanced or highly acidic water. To prevent rusting:

Maintain the water chemistry and balance to avoid excessive acidity.

Install a chemical feeder or salt system after the heater to prevent super chlorinated water from entering.

Consider using a check valve between the heater and sanitizer to prevent water from flowing backwards.

Gas Pool Heater Frequently Asked Questions

If you still have questions about gas pool heaters, here are some common inquiries and their answers:

Is a Fireman Switch necessary?

In most modern heaters, a fireman's switch is not necessary as it is built into the heater. However, it's best to consult your heater manufacturer to confirm.

What power supply do I need?

Gas pool heaters typically require either 120VAC or 240VAC. Some models can operate on both, while older models may be limited to one option. Millivolt ignited heaters function solely on gas power without external electrical power.

Can I convert from natural gas to propane or vice versa?

Yes, modern gas pool heaters can be converted between natural gas and propane. It's recommended to have this conversion performed by a professional, as it involves changing the gas valve and burner orifices.

How do I winterize my gas pool heater?

To winterize your gas pool heater, turn off the water and gas supply, disconnect the gas and plumbing lines, and drain all the water from the heater. Tilt the heater to ensure complete water removal or use a shop vac or blower for assistance.

How can I save on pool heating costs?

In addition to troubleshooting and optimizing your gas pool heater, there are several ways to reduce pool heating costs:

Purchase an energy-efficient gas pool heater.
Supplement pool heating with a solar-powered pool heater.
Use a solar pool cover to minimize heat loss.
Keep the water temperature at the lowest comfortable setting.
Reduce the water temperature when the pool is not in use for extended periods.
Create wind barriers to minimize heat loss.
Turn off the heater when it's not needed.

We hope this comprehensive gas pool heater troubleshooting guide and FAQs section help you enjoy warm pool water while saving money. Remember to consult a qualified service technician for any necessary repairs or maintenance.

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