Cooper & Hunter GRS-C3.5/A1-K

Questions and Answers

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michaelbrownAug 10, 2025
Why does my Cooper & Hunter GRS-C3.5/A1-K Heat Pump wired controller show L6 and the water temperature?
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  Mr. David NguyenAug 10, 2025
  The wired controller displaying L6 and the water temperature alternately indicates that the ambient temperature is outside the operational range of the main unit, preventing it from starting. In this situation, the auxiliary electric heater will run independently, which is normal.
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brandon93Aug 14, 2025
What to do if my Cooper & Hunter GRS-C3.5/A1-K Heat Pump makes strange noises or smells bad?
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  dixonericaAug 14, 2025
  If you notice a strong or unpleasant smell, loud noises, or frequent tripping of the circuit breaker while using your Cooper & Hunter Heat Pump, immediately stop using the unit and disconnect it from the power supply. This indicates a potential safety issue.
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Kelly ClarkAug 19, 2025
What does it mean when my Cooper & Hunter GRS-C3.5/A1-K Heat Pump wired controller displays 'Antifreeze'?
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  Matthew SmithAug 20, 2025
  The wired controller displaying “Antifreeze” means that the Cooper & Hunter Heat Pump is automatically running its anti-freezing function during winter, which is a normal operation.
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Roger PerezAug 25, 2025
Why is water draining from the safety valve of my Cooper & Hunter Heat Pump?
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  Jordan GardnerAug 25, 2025
  A small amount of water draining from the safety valve is normal. This occurs because of overpressure inside the water tank, and the draining is a pressure relief measure.
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smithgabrielaAug 29, 2025
Why is there a temperature difference between the set temperature and the actual water temperature in my Cooper & Hunter GRS-C3.5/A1-K?
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  monicabrandtAug 29, 2025
  If the water temperature differs from the set temperature on the wired controller when the Cooper & Hunter heat pump stops heating, it could be due to a low ambient temperature. In this case, the controller limits the maximum temperature of the heating water by heat pump. The water may be heated independently to specified value by the auxiliary electric heater.
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Jeffrey JohnsonSep 3, 2025
Why does my Cooper & Hunter GRS-C3.5/A1-K make a water flowing sound during operation?
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  Jeremy WalkerSep 4, 2025
  During operation, the swooshing or fizzing sound you hear in your Cooper & Hunter Heat Pump is the normal flow of refrigerant.