Pentair ULTRATEMP ETi 220

Questions and Answers

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kristenmaldonadoAug 14, 2025
What to do if my Pentair ULTRATEMP ETi 220 Heater shows a LOW WATER FLOW alarm?
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  Cory Lowe DDSAug 14, 2025
  If your Pentair Heater displays a LOW WATER FLOW alarm, first ensure the water circulation pump is running. If it is on, check for sufficient water flow by verifying the filter is clean (backwash if needed) and inspecting/cleaning the pump impeller. Also, make sure any external water bypass around the heater is closed. Finally, with water flowing, test the water pressure switch; if it's open, replace it.
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Alexandra KimAug 17, 2025
How to fix a HIGH WATER TEMP alarm on a Pentair ULTRATEMP ETi 220?
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  davidrogersAug 18, 2025
  If you're seeing a HIGH WATER TEMP alarm on your Pentair Heater, the issue could stem from a faulty thermistor, connection, or control board. Begin by checking the water temperature to confirm its accuracy. If the temperature reading seems off, use a 10k ohm resistance test to check the thermistor. Replace the thermistor if it's defective; otherwise, consider replacing the control board.
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michaelgainesAug 21, 2025
Why is my Pentair Heater showing a BROWNOUT alarm?
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  Chelsea NicholsAug 21, 2025
  If your Pentair Heater is showing a BROWNOUT alarm, it could be due to a bad transformer or insufficient supply voltage. Check that the supply voltage to the heater is between 208 and 240 volts, and that the transformer outputs between 22 and 28 volts. If the voltage is outside this range, replace the transformer. Also check to see if a phase is out. A boost transformer may be needed closer to the heater to get voltages within proper range.
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barnesmariaAug 25, 2025
What causes a LOW WATER TEMP alarm on a Pentair Heater and how to resolve it?
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  Michael KruegerAug 25, 2025
  If your Pentair Heater displays a LOW WATER TEMP alarm, it might be due to a faulty thermistor or control board, or debris causing shorted connections. First, test the water temperature to ensure it's accurate. If the temperature is incorrect, use the 10k ohm resistance test to check the thermistor. Replace the thermistor if it's bad. If the thermistor is good, replace the control board. Also, remove any debris or replace the PCB.
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Stephanie BrownAug 27, 2025
How do I troubleshoot a WATER THERM SHORT alarm on my Pentair Heater?
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  Deanna McmahonAug 28, 2025
  If your Pentair Heater is displaying a WATER THERM SHORT alarm, it could be caused by a bad thermistor or a faulty control board. To troubleshoot, use the 10k ohm resistance test to check the thermistor. If the test indicates a short, replace the thermistor. If the thermistor tests fine, then replace the control board.
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davidtownsendAug 31, 2025
What does a WATER THERM OPEN alarm mean on my Pentair ULTRATEMP ETi 220 Heater?
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  Christine GreeneAug 31, 2025
  If your Pentair Heater shows a WATER THERM OPEN alarm, this may be caused by a bad thermistor or a faulty control board. Use the 10k ohm resistance test to verify the thermistor. If the test shows an open, replace the thermistor. If the thermistor is good, replace the control board.
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Amanda BookerSep 3, 2025
What should I do if my Pentair ULTRATEMP ETi 220 shows a SUCTION TH SHORT alarm?
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  Rachel LeSep 3, 2025
  If your Pentair Heater displays a SUCTION TH SHORT alarm, the problem could be a bad thermistor or a faulty control board. Use the 10k ohm resistance test to check the thermistor. If the test shows a short, replace the thermistor. If the thermistor is functioning correctly, replace the control board.
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Douglas LambSep 6, 2025
How to fix a SUCTION TH OPEN alarm on a Pentair ULTRATEMP ETi 220?
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  nkhanSep 6, 2025
  If your Pentair Heater is showing a SUCTION TH OPEN alarm, it could be due to a bad thermistor or a faulty control board. Use the 10k ohm resistance test to verify the thermistor. If the test indicates an open, replace the thermistor. If the thermistor is good, replace the control board.
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Kimberly RuizSep 10, 2025
What causes the REMOTE POOL SPA alarm on my Pentair ULTRATEMP ETi 220 Heater, and how can I fix it?
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  Jonathan HardySep 10, 2025
  To resolve a REMOTE POOL SPA alarm on your Pentair Heater, the automation control output should be modified so that only either the pool and common or spa and common terminals are energized, because Remote pool, spa, and common spade terminals on the back of the control board are all energized.

Summary

IMPORTANT WARNING AND SAFETY INSTRUCTIONS

Electrical Shock and Electrocution Risks

Details risks and precautions for electrical hazards and installation safety.

Consumer Safety Guidelines

Safety rules for pool/spa use, including water temperature and health advice.

Carbon Monoxide Hazards

Information on carbon monoxide risks, symptoms, and necessary precautions.

General Safety Specifications

Installation location and water flow requirements for safe heater operation.

GENERAL INFORMATION

Heater Introduction and Features

Overview of the UltraTemp ETi Hybrid Heater, its technology, and key features.

Installation Requirements and Guidelines

Essential requirements for safe and proper heater installation.

POSITIONING THE HEATER

Site Preparation and Clearances

Guidance on selecting a location, pad requirements, and necessary clearances.

Vent Clearances

Proper installation of exhaust vents to ensure safety and performance.

INSTALLATION

Anchor Clamp Installation

Steps for securing the heater to the equipment pad for wind resistance.

Water Connections and Plumbing

Details on connecting water lines, flow control, and drainage.

Gas Connections and Pressure Testing

Guidelines for gas line installation, sizing, and leak testing.

Electrical Connections and Bonding

Instructions for wiring the heater, including grounding and bonding.

Connecting to an Automation System

Procedures for integrating the heater with automation systems.

OPERATING THE HEATER

Initial Start-Up and Safety Checks

Crucial steps and precautions before first-time operation.

Control Panel Overview and Functions

Explanation of the control panel buttons, display, and operating modes.

Safety Controls and Sensors

Description of various safety devices and their functions.

Using the Operator Menus

Navigating Operator Screens

How to access and use the various operator menu screens for settings.

Heater Operation Settings

Adjusting temperature, modes, timers, and remote controls.

Control Panel Alarm Messages

Using the Service Menus

Service Menu Navigation and Settings

Accessing service menus for language, address, delays, and temperature settings.

Defrost Cycle Configuration

Enabling/disabling the defrost feature for heat pump operation.

MAINTENANCE

Water Chemistry and Balancing

Maintaining optimal water quality for heater health and performance.

Routine Maintenance and Winterizing

General checks, cleaning, condensate management, and seasonal protection.

Spring Start-Up and Professional Service

Procedures for restarting the heater and recommended professional checks.

TECHNICAL DATA

Electrical and Temperature Specifications

Voltage requirements, amperage, and temperature-resistance data.

Pressure and Flow Rate Performance

Charts detailing pressure and flow rate relationships for system performance.

TROUBLESHOOTING

Control Panel Alarms and Error Codes

Identifying and resolving common control panel error messages.

General Operational Issues and Solutions

Troubleshooting common problems like unit not starting or heating.

REPLACEMENT PARTS

Heater Parts Breakdown

Visual guide to major heater components.

Parts List - Refrigeration and Outer Shell

Detailed list of parts for the heater's exterior and refrigeration system.

Parts List - Gas System

Detailed list of replacement parts for the gas components.

Parts List - Electrical and Plumbing

Detailed lists of electrical and plumbing replacement parts.

Pentair ULTRATEMP ETi 220 Specifications

General

Model	ULTRATEMP ETi 220
Category	Heater
Type	Heat Pump
Heating Capacity	220, 000 BTU
Voltage	208-230V
Phase	Single
Compressor Type	Scroll
Refrigerant	R-410A
Weight	265 lbs
Warranty	2 years parts and labor
Frequency	60 Hz
Minimum Flow Rate	30 GPM
Maximum Flow Rate	120 GPM
BTU Heating	220, 000 BTU