Aqua Comfort AC750 User Manual (English)

Questions and Answers:

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David ThomasAug 12, 2025
What to do if the Internal Flow Switch is Open on my Aqua Comfort AC750 Swimming Pool Heater?
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  John CainAug 13, 2025
  If the internal flow switch on your Aqua Comfort Swimming Pool Heater is open, it could be due to several reasons. First, check that the pump is running and ensure there's sufficient water supply, looking for any air leaks. The filter might be dirty or clogged, so clean or replace it. Make sure that valves are correctly positioned and that the filter is not in backwash mode. An undersized pump can also cause this issue, so consider replacing it with an appropriately sized pump. Finally, the water pressure switch might need adjustment or replacement.
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nancy93Aug 16, 2025
Why is the Low Pressure Switch Open on my Aqua Comfort AC750 Swimming Pool Heater?
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  Tracey PattonAug 16, 2025
  If the low-pressure switch is open on your Aqua Comfort Swimming Pool Heater, several factors could be the cause. The evaporator coil might be dirty, so cleaning it is a good first step. Check if the fan motor is running; if not, repair or replace it. Low refrigerant pressure can also trigger this issue, so check the refrigerant levels and recharge if necessary. Finally, the low-pressure switch itself might be defective and require replacement.
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Amanda OlsonAug 20, 2025
What causes the High Pressure Switch to Open on an Aqua Comfort AC750?
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  Stacey WatsonAug 20, 2025
  If the high-pressure switch is open on your Aqua Comfort Swimming Pool Heater, it could be due to low water flow to the heater. Make sure that there is adequate water flow. Alternatively, the high-pressure switch itself may be defective and need replacement.
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Margaret MorganAug 25, 2025
How to fix a Water Thermistor Open error on Aqua Comfort Swimming Pool Heater?
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  lisawyattAug 25, 2025
  If you're getting a 'Water Thermistor Open' error on your Aqua Comfort Swimming Pool Heater, it could be due to a loose sensor wire, so ensure that it is secure. If the wire is secure, the water thermistor itself might be defective and need replacement.
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conwayjenniferAug 27, 2025
What should I do if the Water Thermistor is Closed on my Aqua Comfort AC750?
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  travis43Aug 27, 2025
  If the water thermistor is closed on your Aqua Comfort Swimming Pool Heater, it could be because the wire terminals are touching; try separating them. If that doesn't resolve the issue, the water thermistor itself might be defective and need replacement.
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bennettdavidAug 31, 2025
What does it mean when the Defrost Sensor is Open on an Aqua Comfort Swimming Pool Heater?
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  cmooreAug 31, 2025
  If the defrost sensor is open on your Aqua Comfort Swimming Pool Heater, it could indicate a loose sensor wire. Make sure the wire is secure. If the wire is properly connected, the defrost sensor itself may be defective and require replacement.
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Danielle BakerSep 4, 2025
Why is my Aqua Comfort Swimming Pool Heater showing a Defrost Sensor Closed error?
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  Rebecca GutierrezSep 4, 2025
  If your Aqua Comfort Swimming Pool Heater shows a 'Defrost Sensor Closed' error, it might be because the wire terminals are touching. Separate the terminals and see if that resolves the issue. If not, the defrost sensor itself may be defective and require replacement.
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Sandra CastilloSep 7, 2025
What to do if the Control Voltage is Below 18VAC on my Aqua Comfort Swimming Pool Heater?
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  Sean WolfSep 7, 2025
  If the control voltage is below 18VAC on your Aqua Comfort Swimming Pool Heater, check the supply voltage to the unit.