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Pentair ULTRATEMP 110 - User Manual

Pentair ULTRATEMP 110
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ULTRATEMP
®
HEAT PUMP
INSTALLATION AND
USER’S GUIDE
IMPORTANT SAFETY INSTRUCTIONS
READ AND FOLLOW ALL INSTRUCTIONS
SAVE THESE INSTRUCTIONS
ESPAÑOL
ENGLISH
FRANÇAIS

Table of Contents

Questions and Answers

  • A
    anthony55Sep 5, 2025
    Why is my Pentair ULTRATEMP 110 Heat Pump showing a high water temperature alarm?
    • U
      uguzmanSep 5, 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.
  • S
    Susan FreyNov 19, 2025
    Why does my Pentair ULTRATEMP 110 show a high refrigerant alarm?
    • M
      Michele ClementsNov 19, 2025
      A high refrigerant alarm on your Pentair Heat Pump can stem from several issues. Begin by confirming that the water circulation pump is active and that there's sufficient water flow, ensuring filters and skimmers are clean via backwashing if needed. Also, check that any external water bypass around the heat pump is closed and all other valves are correctly positioned for proper water flow. A faulty refrigerant high-pressure switch could be the cause; check its resistance and replace if open. Other potential causes include a TXV stuck closed, in which case you should disconnect the TXV bulb from suction line, have it in your hand, if pressures go back to normal, then reinstall the bulb on suction line. For adjustable TXVs open adjustable valve, it may remove the debris and set it back to or...
  • J
    James WilsonSep 18, 2025
    What does remote pool spa alarm mean on Pentair ULTRATEMP 110?
    • M
      Ms. Robin AndersonSep 18, 2025
      A REMOTE POOL SPA alarm on a Pentair Heat Pump indicates that the remote pool, spa, and common spade terminals on the back of the control board are all energized at the same time. To resolve this, modify the automation control output so that only either the pool and common or spa and common terminals are energized, but not all simultaneously.
  • J
    Jeremiah MarshallSep 16, 2025
    How do I fix a suction th open alarm on my Pentair ULTRATEMP 110 Heat Pump?
    • A
      Ann HollandSep 16, 2025
      To address a suction th open alarm on your Pentair Heat Pump, which indicates an open defrost refrigerant temperature sensor circuit, begin by using the 10k ohm resistance test to verify the thermistor. If the test reveals an open circuit, replace the thermistor. If the thermistor is functioning correctly, the issue likely lies with the control board, necessitating its replacement.
  • N
    nloveSep 14, 2025
    What does suction th short alarm mean on Pentair ULTRATEMP 110 Heat Pump?
    • J
      Jessica RussoSep 14, 2025
      If your Pentair Heat Pump displays a suction th short alarm, it indicates that the defrost refrigerant temperature sensor circuit is shorted. This is often due to a faulty thermistor or a bad control board. To fix this, use the 10k ohm resistance test to check the thermistor. If the test shows a short, replace the thermistor. If the thermistor is good, the problem is likely the control board, which will need to be replaced.
  • C
    Christopher DorseySep 12, 2025
    How to troubleshoot a water therm open alarm on a Pentair ULTRATEMP 110?
    • R
      Rachel MorrisSep 12, 2025
      To troubleshoot a water therm open alarm on your Pentair Heat Pump, which indicates an open water temperature sensor circuit, start by testing the thermistor using the 10k ohm resistance test. If the test shows an open circuit, replace the thermistor. If the thermistor tests good, the issue is likely with the control board, which should be replaced.
  • J
    jason24Sep 12, 2025
    What to do if Pentair ULTRATEMP 110 shows water therm short alarm?
    • S
      stephaniesolomonSep 12, 2025
      If your Pentair Heat Pump displays a water therm short alarm, it means the water temperature sensor circuit is shorted. This is often due to a bad thermistor or a bad control board. To resolve this, use the 10k ohm resistance test to verify the thermistor. If the test shows a short, replace the thermistor. If the thermistor is good, then the control board needs to be replaced.
  • F
    fwatsonSep 8, 2025
    What does it mean when my Pentair ULTRATEMP 110 displays a low water temperature alarm?
    • K
      Kaitlyn HallSep 9, 2025
      A low water temperature alarm on your Pentair Heat Pump indicates that the water temperature is below 40°F [4.4°C]. This can be caused by a bad thermistor or control board, or debris shorting the connections. First, test the water temperature to see if the reading is correct. If it is not, use the 10k ohm resistance test to verify the thermistor. Replace the thermistor if it is bad, otherwise, replace the control board. Also, remove any debris or replace the PCB.
  • D
    danielnashSep 7, 2025
    Why is ice forming on my Pentair Heat Pump?
    • J
      James NguyenSep 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.
  • D
    Daniel OwenAug 22, 2025
    What causes a low refrigerant alarm on a Pentair ULTRATEMP 110?
    • T
      Tyler RojasAug 22, 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.

Summary

Safety and Warnings

Important Safety Instructions

Covers essential safety precautions for installation, operation, and general use.

General Safety Warnings

Covers essential safety precautions for installation, operation, and general use.

Electrical Safety

Details risks of electrical shock and proper installation.

Consumer Safety Guidelines

Provides safety rules for hot tub use and health considerations.

Installation and Setup

Installation Site and Location

Water Pressure Switch Adjustment

Electrical Connections and Wiring

Details wiring, bonding, and main power connection procedures.

Operation and Control

Operating the Heat Pump

Provides guidance on the normal operation of the heat pump unit.

Using the Control Panel

Automation System Connectivity

Timers, Delays, and Alarm Messages

MAINTENANCE AND TECHNICAL INFORMATION

MAINTENANCE

Covers essential maintenance tasks for the heat pump.

Water Chemistry and Winterization

Spring Start Up and Inspections

Professional Maintenance

TECHNICAL INFORMATION

TROUBLESHOOTING

TROUBLESHOOTING

Provides solutions for common problems and error conditions.

Water Temperature and Flow Alarms

Refrigerant and Sensor Faults

Diagnosing refrigerant pressure and sensor-related alarm conditions.

Operational and Electrical Issues

TXV, Refrigerant Charge, and Phase Monitor Issues

Pentair ULTRATEMP 110 Specifications

General IconGeneral
ModelULTRATEMP 110
Heating Capacity110, 000 BTU/h
PhaseSingle
Hertz60 Hz
RefrigerantR-410A
Minimum Water Flow Rate30 GPM
Operating Temperature Range50°F to 104°F
Compressor TypeScroll

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