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Why does my Hayward pool heater keep shutting off?

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Asked By: Argelina Korff | Last Updated: 17th June, 2020
A dirty filter can cause low pressure and as a result, cause the heater’s pressure switch to turn OFF. A dirty filter can prevent a heater from firing and it can also cause your heater to shut off before warming the water to the desired temperature.

Similarly, it is asked, how do I fix my pool heater?

  1. Heater Won’t Turn On or Does Not Stay On. Clean the filter and turn the thermostat up to try the heater again.
  2. Low Flow or Inadequate Heating. If your heater shuts off before warming the water to the desired temperature, it may be the result of a dirty filter or an improperly set timer.
  3. Noise.
  4. When to Call a Professional.

Furthermore, what does AO mean on a Hayward pool heater? AO Blower vacuum switch open error If the blower prover switch does not close after the blower starts the control will stop the ignition trial go into lockout. The blower will continue to run.

Also, can I leave my pool heater on all the time?

Efficient use of pool heater. Your theory is correct. It is one in the same to either leave the heater on all night or to start again from a lower temperature in the morning except that you lose hours of warm water swimming time in the morning if you leave the heater off all night.

Why does my pool heater keep shutting off?

A dirty filter can cause low pressure and as a result, cause the heater’s pressure switch to turn OFF. A dirty filter can prevent a heater from firing and it can also cause your heater to shut off before warming the water to the desired temperature.

How do I reset my pool heater?

In most cases, you can reset the lockout in a relatively short time by following a standard procedure.
  1. Reset the breaker for the electrical circuit to the pool heater by flipping the breaker switch to the “Off” position and then to the “On” position.
  2. Remove the cover on the digital control panel.

How do you test a pool heater?

Common Gas Pool Heater Problems
  1. Your Heater Won’t Ignite.
  2. The Pilot Won’t Light.
  3. Heater Won’t Heat to the Desired Temperature.
  4. Heater Cycles On and Off.
  5. The Heater Is Leaking.
  6. Heater Leaks When Burner Is Lit.
  7. Top is Black or Dark Exhaust.
  8. Rust from the Heater.

Is it normal to smell gas from a pool heater?

Gas is delivered to the heater through a number of connections. All of these connections can develop leaks, which can lead to fire or explosions. Sometimes, leaks have a smell because gas suppliers add a “rotten egg” smell. But otherwise natural gas is odorless and colorless.

How do you clean a pool filter?

Cleaning with Muriatic Acid
  1. Backwash the filter for 3 to 5 minutes to remove debris.
  2. Turn the pump off.
  3. Open the air relief valve.
  4. Remove the drain plug, and let the water drain out of the filter tank.
  5. Remove the clamps (or other latching mechanisms) holding the filter together.
  6. Open the filter tank.

Can pool heaters be repaired?

Pool Heater Repair Cost

Swimming pool heater repair costs $424 on average, or between $160 and $687. Common issues that might warrant repair include failure to power on or reach the temperatures you set. The extent of wear or damage (and the type of pool heater itself) can affect repair costs, too.

How does a gas pool heater work?

How They Work. Gas pool heaters use either natural gas or propane. As the pump circulates the pool’s water, the water drawn from the pool passes through a filter and then to the heater. The gas burns in the heater’s combustion chamber, generating heat that transfers to the water that’s returned to the pool.

How long does it take to heat a pool?

Overall, a heat pump usually requires between 24 and 72 hours to heat a swimming pool by 20°F (11°C) and between 45 and 60 minutes to heat a spa by 20°F (11°C). So now you know some factors that affect your swimming pool’s or spa’s required heating time.

How do you clean a Hayward pool heater?

How to Clean a Hayward Pool Heater
  1. Remove the screws from the pool heater top and take this piece off.
  2. Check the burner flames.
  3. Turn off the burners and allow them to cool.
  4. Disconnect the high-limit wires from the heat exchanger and the thermistor leads from the control panel.
  5. Remove the four screws from the retaining air deflector and take if off.

Should I turn my heater off at night?

According to doctors, temperatures below 60-67 is not ideal for sleeping. So turning your heat off at night isn’t just uncomfortable, it can also cause you to lose sleep. In fact, the colder it is outside and the warmer the indoor temperature, the faster the temperature will drop when the heat is turned off.

Is it better to leave the water heater on all the time?

It’s better to leave the hot water heater on all the time, rather than turning it on and off. Your immersion heater or boiler will heat up hot water which is stored in a tank. As long as the tank has a good insulating jacket, it will keep the water hot all day, without needing to be constantly reheated.

What should I set my pool heater to?

Young children, the elderly and others often need 80 degrees F or warmer water, however, and hydrotherapy calls for warmer water, too. Although 78 degrees F to 82 degrees F takes in about everyone, how warm you should keep your pool actually depends on personal preference. Obviously, a heated pool means more swimming.

How much does it cost to repair a pool heater?

According to, the average cost nationwide to repair a swimming pool heater is about $400 to $600. Based on the type of repair and local pricing, however, actual repair costs could be significantly higher or lower. A recommended annual pool heater tune-up costs $100 to $200.

Is gas or electric pool heater better?

Because of the cost involved in operation and speed at which they warm water, gas heaters are typically recommended as backup heaters or for pools that don’t have to be heated often. In contrast, electric swimming pool heaters are better for extended use.

How much heat does a pool lose overnight?

Pools that are not covered can lose 4° F to 5° F overnight in most parts of the country. With a cover, you can reduce that heat loss by 50% or more. So without a heater you should be able to use your pool in the afternoons and early evenings, in the warmest part of the season.

How long should pool pump run?

Swimming pool pumps should be run an average 8 hours a day to properly circulate and clean your water. The pump should push your entire pool in gallons in this 8 hour period of time. However, often times swimming pool pump horse power is overrated for their size swimming pool.

Should I leave my pool pump on all the time?

Although it’s generally recommended that all the pool water undergo filtration every 24 hours, the pump does not need to run all the time. If your pool is in constant use, you may need to run the pump for up to eight hours per day, frequently checking the water clarity and chemical balance.

How do you change the Armistor on a Hayward pool heater?

To replace the thermistor:
  1. Turn pump, gas supply, and heater power “OFF”.
  2. Drain the heat exchanger of all water.
  3. Remove the front access panel.
  4. Remove the control box cover.
  5. Unplug the thermistor connector from the ignition control board.

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