Pentair ULTRATEMP 120 User Manual (English)

Questions and Answers:

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Patrick MendezAug 22, 2025
What causes a low refrigerant alarm on a Pentair Heat Pump?
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  Terry HarrisAug 23, 2025
  A low refrigerant alarm on your Pentair Heat Pump can occur due to several reasons. The most common cause is low refrigerant in the system, which requires locating and fixing the refrigerant leak, then pulling a vacuum and recharging the system. It can also happen if the air and water temperatures are too cold for the heat pump to operate; in this case, wait for warmer temperatures. A faulty refrigerant low-pressure switch can also trigger the alarm; check its resistance with a full charge and replace it if open. Lastly, a faulty fan, capacitor or fan motor could be the problem; inspect these components and replace if needed, also check the fan blade and make sure it is not slipping or broken and replace if needed.
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ruizmartinAug 25, 2025
What to do if Pentair ULTRATEMP 120 Heat Pump shows LOW WATER FLOW alarm?
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  Hannah RamirezAug 25, 2025
  If your Pentair Heat Pump displays a LOW WATER FLOW alarm, it means the pressure switch isn't sensing water flow. Here's what you should check: * First, ensure your water circulation pump is running. * Second, check for sufficient water flow by cleaning dirty or worn filters and clogged lint traps. Backwash if needed, or replace the filter element. Inspect and clean the pump impeller. Adjust plumbing valves and repair any suction air leaks. * Third, make sure any external water bypass around the heat pump is closed. * Finally, with water flowing, check the resistance of the water pressure switch; if it's open, replace the switch.
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Olivia DavisAug 26, 2025
Why is the fan not turning on my Pentair Heat Pump?
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  Christopher WrightAug 26, 2025
  If your Pentair Heat Pump has power and the set temperature is above the actual temperature, but the fan isn't turning and there are no alarms, it could be due to a faulty fan relay, capacitor, fan motor, control board failure, or incorrect wiring. Contact a dealer for guidance before attempting to replace any parts. Potential solutions include replacing the fan relay, capacitor, fan motor, or control board.
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Caroline SimmonsAug 28, 2025
Why won't my Pentair ULTRATEMP 120 start?
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  Kathleen PottsAug 28, 2025
  If your Pentair Heat Pump has power, the green light is on, and the set temperature is above the actual temperature, but the unit won't start heating or cooling and there are no alarms, it could be due to the remote feature being enabled without a controlling device connected. Check to see if the Remote feature on the Control Board is enabled and disable it if needed. Another possibility is a control failure, in which case you should contact a dealer or the factory for advice before attempting to replace parts, but replacing the control board may be necessary.
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Tammy HartAug 29, 2025
What to do if Pentair ULTRATEMP 120 Heat Pump displays HIGH WATER TEMP alarm?
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  John ArellanoAug 29, 2025
  If your Pentair Heat Pump is showing a HIGH WATER TEMP alarm (water temperature above 107°F [41.7°C]), the issue might be a bad thermistor or a faulty control board. Verify the water temperature to see if it is correct. If it is not, use the 10k ohm resistance test to verify the thermistor. If the thermistor is bad, replace it. If the thermistor is good, then replace the control board.
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amy05Aug 31, 2025
Why Pentair ULTRATEMP 120 Heat Pump shows LOW WATER TEMP alarm?
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  Dr. Diamond BenderAug 31, 2025
  If your Pentair Heat Pump displays a LOW WATER TEMP alarm (water temperature below 40°F [4.4°C]), a potential cause is a faulty thermistor or a bad control board. To resolve this, first test the water temperature to ensure it's accurate. If the temperature reading is incorrect, use the 10k ohm resistance test to check the thermistor. Replace the thermistor if it's defective; otherwise, replace the control board.
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fpattonSep 2, 2025
What to do if Pentair ULTRATEMP 120 Heat Pump shows LOW WATER TEMP alarm because of debris?
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  Stephanie MooreSep 2, 2025
  If your Pentair Heat Pump displays a LOW WATER TEMP alarm, and the cause is debris shorting the connections, remove the debris or replace the PCB.
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Michael SmithSep 4, 2025
How to fix a brownout alarm on my Pentair Heat Pump?
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  davisalexanderSep 4, 2025
  To address a brownout alarm on your Pentair Heat Pump, start by checking the supply voltage to the transformer, it should be between 208 and 260 volts, and the transformer's output, which should be between 24 and 28 volts; replace the transformer if the output is below this range. Also, check the supply voltage to the heat pump, ensuring it's between 208 and 260 volts, and verify that there isn't a phase outage, with 120 volts to ground and 240 volts across power legs. If voltage issues persist, consider installing a boost transformer closer to the heat pump to maintain proper voltage levels.
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williamlewisSep 5, 2025
Why is my Pentair ULTRATEMP 120 showing a high water temperature alarm?
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  Gary AdamsSep 6, 2025
  A high water temperature alarm on your Pentair Heat Pump indicates that the water temperature is above 107°F [41.7°C]. This can be due to a bad thermistor or a bad control board. Test the water temperature to ensure it's accurate. If the temperature reading is incorrect, use a 10k ohm resistance test to verify the thermistor. Replace the thermistor if it's faulty; otherwise, replace the control board.
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Joshua HaynesSep 7, 2025
Why is ice forming on my Pentair Heat Pump?
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  Amanda OwensSep 7, 2025
  Ice or frost forming on the outer air coil of your Pentair Heat Pump, typically at the bottom, can occur if the discharge air flow is restricted. Ensure the heater is installed with the required placement clearances for air flow and roof clearance, and do not install it indoors. Also, ensure sprinklers do not spray on the heater. Another cause could be that the outside air temperature is too low and the defrost feature is not enabled. Make sure heater is installed with the required placement clearances for air flow and roof clearance, and do not install it indoors. If ice forms, shut off the heater and allow the ice to thaw.

Pentair ULTRATEMP 120 Specifications

General

Model	ULTRATEMP 120
Heating Capacity	120, 000 BTU/hr
COP (Coefficient of Performance)	5.0
Refrigerant Type	R-410A
Phase	Single
Hertz	60 Hz
Weight	350 lbs
Voltage	208/230V
Maximum Current	50 A
Operating Temperature Range	40°F - 100°F