Pentair ULTRATEMP 90 - User Manual

Questions and Answers

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john79Aug 19, 2025
What to do if Pentair ULTRATEMP 90 shows low water flow alarm?
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  barkerlisaSep 12, 2025
  If your Pentair Heat Pump displays a low water flow alarm, several factors could be the cause. First, ensure the water circulation pump is running. Insufficient water flow might be due to dirty or worn filters, clogged lint traps, or a clogged pump impeller; clean or replace filters, inspect the pump impeller, and adjust plumbing valves. Check for and repair any suction air leaks. Also, verify that any external water bypass around the heat pump is closed. Finally, a faulty water pressure switch could be the culprit; if water is flowing, check the switch's resistance, and replace it if it's open.
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Michele StoutAug 23, 2025
What causes a low refrigerant alarm on a Pentair Heat Pump?
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  rdanielsAug 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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Jordan Goodwin MDAug 26, 2025
Why is the fan not turning on my Pentair Heat Pump?
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  Douglas MorganAug 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.
L
Lindsay BarajasAug 27, 2025
Why won't my Pentair ULTRATEMP 90 Heat Pump start?
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  Robert NashAug 27, 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.
S
snyderkelseyAug 30, 2025
How to fix a brownout alarm on my Pentair ULTRATEMP 90 Heat Pump?
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  uwagnerAug 30, 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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morrisonjohnSep 1, 2025
Why is my Pentair ULTRATEMP 90 Heat Pump showing a high water temperature alarm?
- J
  jmcdanielSep 1, 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.
G
Gary ThomasSep 3, 2025
Why is ice forming on my Pentair Heat Pump?
- D
  David GonzalezSep 3, 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.
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Patricia CampbellSep 5, 2025
What does it mean when my Pentair ULTRATEMP 90 Heat Pump displays a low water temperature alarm?
- J
  John ThompsonSep 5, 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.
J
janet71Sep 7, 2025
What to do if Pentair ULTRATEMP 90 shows water therm short alarm?
- M
  Melissa MarshSep 7, 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.
Q
qmooreSep 9, 2025
How to troubleshoot a water therm open alarm on a Pentair ULTRATEMP 90 Heat Pump?
- D
  Daniel SkinnerSep 9, 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.

Summary

Important Safety Instructions

Codes and Standards

Outlines compliance with UL and Canadian electrical codes for installation.

Electrical Shock and Electrocution Warning

Warns about electrical hazards and requirements for qualified electricians.

Consumer Safety Guidelines

Provides safety advice for pool/spa use, including temperature limits and health considerations.

Warranty Information

Details the limited factory warranty and conditions that may void it.

General Specifications

Lists installation location, pipe connections, flow rate, pressure, and voltage requirements.

Quick Start Guide: Menu Tree Navigation

Operator Menu Tree Overview

Displays the operator menu structure for navigating settings and parameters.

Pre-Installation Guide

Heat Pump Overview

Explains how heat pumps work, ideal conditions, and operational expectations.

Installation Requirements

Lists essential requirements for safe and proper Pentair heat pump installation.

General Installation Information

Covers installer qualifications, electrical source, and intended use for pools/spas.

General Features

Highlights key features like dual thermostats, titanium exchanger, self-diagnostics, and automation compatibility.

Installation and Location

Installation Site Caution

Warns about potential flooding and damage from leaks when equipment is below pool surface.

Materials Needed for Installation

Lists items the installer must supply for heat pump installation, including plumbing and electrical.

Equipment Pad Requirements

Specifies requirements for the pad, including flatness and pitch for drainage.

Drainage and Condensation Management

Explains condensation formation and the importance of keeping drain ports clear.

Roof Run-off and Lawn Sprinklers

Advises on avoiding roof run-off and sprinkler spray to prevent unit damage or warranty voiding.

Heat Pump Dimensions

Provides a table showing the dimensions for different heat pump models.

Location and Clearances

Minimum Clearances for Access and Airflow

Details required clearances around the unit for service, airflow, and specific installation scenarios.

Anchor Clamp Installation

Recommends and guides the installation of anchor clamps for wind resistance.

Water Connections and Plumbing

Standard Plumbing Layout

Illustrates a typical plumbing setup for a single heat pump unit.

Automatic Flow Control Valve

Explains the function of the internal flow control valve and when a bypass valve is needed.

Heat Pump Water Connections

Inlet and Outlet Connections

Describes how to connect water inlet and outlet using 2-inch quick connect fittings.

Drainage Connection

Details the installation of a drain hose barb for condensate and water drainage.

Water Pressure Switch Adjustment

Adjustment for Below Pool Water Level

Provides steps to adjust the pressure switch when the unit is below the pool water level.

Adjustment for Above Pool Water Level

Provides steps to adjust the pressure switch when the unit is above the pool water level.

Multiple Unit Installation

Heat Pump, Heater, Solar Combination

Discusses combining heat pumps with other heating sources like heaters or solar.

Multiple Heat Pump Connections

Covers parallel plumbing for multiple heat pumps and flow rate requirements.

Electrical Connections and Wiring

General Information on Wiring

Guides on making wiring connections as per diagrams and includes bonding requirements.

Main Power Wiring Procedure

Step-by-step instructions for wiring the heat pump to the electrical source.

Wiring Diagrams

Single Phase Wiring Diagram (50 Hz;60 Hz)

Illustrates the wiring connections for single-phase models.

Wiring Diagrams

Three Phase Wiring Diagram (60 Hz)

Illustrates the wiring connections for three-phase models.

Automation System Integration

Remote Operation and Relay Controls

Connects heat pump to automation systems via spade terminals or relay controls.

Spade Terminal Connection to IntelliTouch;EasyTouch

Guides connecting the heat pump to a load center using spade terminals for remote control.

RS-485 Connector Connection to IntelliTouch;EasyTouch

Details connecting the heat pump to a load center via RS-485 for advanced automation control.

RS-485 Connection Pin Configuration

Specifies pin configuration for connecting the heat pump control board to IntelliTouch via RS-485.

Operating the Heat Pump

Initial Start-Up Precautions

Important precautions before initial heat pump operation, including water flow and delays.

Swimming Pool Energy Saving Tips

Provides recommendations for efficient heat pump operation and energy conservation.

Heat Pump Control Panel Overview

Explains the function of each button and indicator on the heat pump's control panel.

Operator Menu Tree Guide

Navigating Operator Menu Screens

Instructions for navigating the service menu for advanced settings and diagnostics.

Operator Menu Screen Descriptions

Explains the purpose of each menu screen, such as Pool/Spa, Heat/Cool Mode, and Alarm Status.

Using the Control Panel

Starting and Stopping the Heat Pump

Instructions on how to turn the heat pump on and off using the ON/OFF button.

Changing the Set Point (Temperature)

How to adjust pool and spa temperature set points using the control panel.

Heat, Cool, and Auto Modes

Explains the operation of different modes: Heat Only, Cool Only, and Auto.

Heat Pump Timer Function

Describes how to set the timer for automatic operation of the heat pump.

Using the Control Panel

AutoSet Operation Feature

Details the AutoSet feature for independent filter pump activation for sensing water temperature.

Extend Operation Feature

Explains the Extend feature for activating the filter pump to sense water temperature after a cycle.

Timers and Delays

Water Sensing Timer

A one-minute timer for water temperature acquisition before operation.

Restart Delay Timer

A five-minute timer protecting the compressor from rapid cycling.

Defrost Delay Timer

A fifteen-minute timer used during defrost operation.

Pump Start Delay

A 1-4 hour timer used with AutoSet to control filter pump activation.

Heat Pump Runtime Timer

An adjustable timer to set a specific runtime for the heat pump.

Control Panel Alarm Messages

Lists and explains various alarm messages displayed on the control panel.

Service Menu Tree Guide

Navigating Service Menu Screens

Instructions for navigating the service menu for advanced settings and diagnostics.

Service Menu Options Explained

Describes options like language, software revision, Intell Address, and temperature settings.

Control Panel Settings and Features

Temperature Scale Adjustment

How to change the temperature display between Fahrenheit and Celsius.

Water Temperature Offset Adjustment

How to adjust the displayed water temperature by +/- 2 degrees.

Defrost Cycle Operation

Explains the defrost cycle, including passive cycle and when it activates.

Locking the Control Panel

How to lock the control panel to prevent unauthorized adjustments.

Maintenance

Water Chemistry Requirements

Importance of water chemistry and recommended levels for heat pump longevity.

Winterizing Procedure

Steps to properly drain and protect the heat pump for winter.

Spring Start Up Procedure

Steps for preparing the heat pump for operation after winter storage.

Inspection and Service

Emphasizes periodic inspections for safe and efficient operation.

Owner Inspection Guidelines

Basic guidelines for owners to inspect their heat pump regularly.

Maintenance

Condensate Drainage Inspection

How to inspect for proper condensate drainage and identify potential leaks.

Professional Maintenance Recommendations

Advice on regular professional cleaning and maintenance for optimal performance.

Technical Information

Electrical Supply Voltage Requirements

Table detailing voltage, phase, Hz, and amp requirements for various models.

Temperature Resistance Chart

Chart showing resistance values for thermistors at different temperatures.

Technical Information

Heat Pump Pressure Drop Data

Graphs and tables showing pressure drop based on water flow and conditions.

Troubleshooting

High and Low Water Temperature Alarms

Explains causes and corrective actions for high/low water temperature alarms.

Low Water Flow Alarm

Details causes and solutions for the low water flow alarm.

Remote Pool;Spa Alarm

Addresses issues when remote pool and spa inputs are energized simultaneously.

Thermistor Alarms

Explains shorted or open water temperature and defrost thermistor alarms.

Brownout Alarm

Discusses low 24 VAC supply voltage issues and checks.

Troubleshooting

High and Low Refrigerant Pressure Alarms

Causes and corrections for high and low refrigerant pressure switch alarms.

TXV Stuck Issues

Troubleshooting TXV stuck closed or open for pressure and superheat issues.

Five Alarms Fault

Explains the five alarms fault and how to reset it.

Troubleshooting

Unit Not Starting or Displaying Blank

Addresses issues when the unit won't turn on or the display is blank.

Unit Not Heating or Cooling

Troubleshooting when the unit is on but not heating/cooling, or cycling incorrectly.

Frost;Ice on Outer Air Coil

Explains causes of frost/ice formation and how to resolve it.

Fan Not Running or No Air Discharge

Diagnoses problems with the fan not operating or air not being discharged.

Spa;Pool Not Reaching Temperature

Troubleshooting slow heating or failure to reach maximum temperature.

Troubleshooting

High;Low Pressure and TXV Issues

Further details on high/low head pressure and TXV performance.

Unit Running Continuously or Breaker Tripping

Addresses issues with continuous running or tripping breakers.

3-Phase Unit Specific Troubleshooting

Troubleshooting for 3-phase units, including wiring and phase monitor issues.

Replacement Parts

Illustrated Parts View

Diagrams showing the location of various parts within the heat pump.

Replacement Parts

Parts List by Item Number

A detailed list of replacement parts with part numbers and descriptions.

Pentair ULTRATEMP 90 Specifications

General

Model	ULTRATEMP 90
Type	Heat Pump
Heating Capacity	90, 000 BTU/hr
Refrigerant	R-410A
Compressor Type	Scroll
Phase	Single
Operating Temperature Range	50°F to 104°F
Voltage	208/230V