Daikin Altherma ERLQ004-006-008CA User Manual (English)

Questions and Answers:

C
Chris McdanielAug 16, 2025
Why is my Daikin Air Conditioner not heating well in cold weather?
- S
  samanthalandryAug 16, 2025
  If your Daikin Air Conditioner isn't sufficiently heating your space at low outdoor temperatures, the backup heater equilibrium temperature might not be configured correctly. Increase the "equilibrium temperature" to activate the backup heater operation at a higher outdoor temperature. Also, check if too much heat pump capacity is being used for heating domestic hot water. Ensure that the “space heating priority status” has been enabled and increase the "space heating priority temperature" to activate the backup heater operation at a higher outdoor temperature.
M
mary86Aug 19, 2025
What to do if the water pressure relief valve leaks in my Daikin Air Conditioner?
- L
  Lisa WilsonAug 19, 2025
  If the water pressure relief valve in your Daikin Air Conditioner is leaking, it could be that dirt is blocking the water pressure relief valve outlet. Check whether the pressure relief valve works correctly by turning the red knob on the valve counterclockwise. If you do NOT hear a clacking sound, or if the water keeps running out of the unit, contact your dealer.
K
Katelyn TorresAug 22, 2025
How to troubleshoot a Daikin Altherma ERLQ004-006-008CA that is not heating?
- C
  cferrellAug 22, 2025
  If your Daikin Air Conditioner unit is not heating, it might be because the water volume in the installation is too low. Make sure that the water volume in the installation is above the minimum required value.
T
Timothy WilliamsAug 25, 2025
Why is my Daikin Altherma ERLQ004-006-008CA compressor not starting?
- A
  Andrew MclaughlinAug 26, 2025
  If your Daikin Air Conditioner's compressor isn't starting, several factors could be at play. First, the water temperature might be too low, causing the unit to rely on the backup heater. Ensure the backup heater is correctly wired, its thermal protector isn't activated, and the contactor isn't broken. If the issue persists, it could be a mismatch between the preferential kWh rate power supply settings and electrical connections; verify these connections. Finally, the electricity company might have sent a preferential kWh rate signal, in which case you should wait for the power to return, which can take up to 2 hours.
A
Amy KellyAug 28, 2025
How to fix a noisy pump in my Daikin Air Conditioner?
- B
  Brianna WalshAug 28, 2025
  If the pump in your Daikin Air Conditioner is making noise, it could be due to air in the system. Try purging air manually on both zones or use the automatic air purge function on both zones. Another possibility is that the water pressure at the pump inlet is too low. Check that the water pressure is above 1 bar, the manometer isn't broken, the expansion vessel isn't broken, and the pre-pressure setting of the expansion vessel is correct.
A
Anthony HollandAug 31, 2025
What to do if the pressure relief valve opens on my Daikin Air Conditioner?
- H
  harttheresaAug 31, 2025
  If the pressure relief valve of your Daikin Air Conditioner is opening, the expansion vessel might be broken. In this case, you should replace the expansion vessel.
B
Brady SchaeferSep 3, 2025
Why is the tank disinfection failing on my Daikin Altherma ERLQ004-006-008CA (AH-error)?
- K
  Kevin DavisSep 3, 2025
  If the tank disinfection function in your Daikin Air Conditioner is not completing correctly (AH-error), it might be because the disinfection function was interrupted by domestic hot water tapping. Try programming the start-up of the disinfection function when no domestic hot water tapping is expected for the next 4 hours. Another cause could be that the backup heater operation is not activated. Ensure that the backup heater operation mode is enabled and that the thermal protector of the backup heater has not been activated. If it has, check the water pressure and whether there is air in the system, then perform the air purge operation and press the reset button in the switch box.
M
Molly PerezSep 6, 2025
Why is the water pressure unusually high in my Daikin Air Conditioner?
- V
  vanessawellsSep 6, 2025
  If the pressure at the tapping point of your Daikin Air Conditioner is temporarily unusually high, it could be due to a failing or blocked pressure relief valve. Flush and clean the complete tank including the piping between pressure relief valve and the cold water inlet. If needed, replace the pressure relief valve.
E
eric19Sep 9, 2025
What to do if hot water use interferes with disinfection on my Daikin Air Conditioner?
- J
  Joel BrownSep 9, 2025
  If large domestic hot water tapping happened recently before the programmed start-up of the disinfection function of your Daikin Air Conditioner, and the Domestic hot water > Type > Reheat or Reheat + sched. is selected, it is recommended to program the start-up the disinfection function at least 4 hours later than the last expected large hot water tapping. Also, avoid pressing the button while the disinfection function is active, as the disinfection operation can be stopped manually.
J
jordanhannahSep 12, 2025
Why are the panels bulging on my Daikin Air Conditioner's tank?
- T
  Tracy WardSep 12, 2025
  If the decoration panels of your Daikin Air Conditioner are being pushed away due to a swollen tank, it's likely due to a failing or blocked pressure relief valve. Contact your local dealer for assistance.

Daikin Altherma ERLQ004-006-008CA Specifications

General

Category	Air Conditioner
Model	ERLQ004-006-008CA
Energy Efficiency Class (Heating)	A++
Refrigerant	R-410A
Type	Heat Pump
Operating Temperature Range (Heating)	-20°C to 35°C
Operating Temperature Range (Cooling)	10 to 46 °C

Summary

General Safety Precautions

About the Documentation

Safety instructions and documentation overview. Essential reading before installation.

About the Documentation

About This Document

Details the documentation set and target audience for installers.

Installer Reference Guide at a Glance

Overview of chapters and their content in the installer guide.

About the Box

Overview: About the Box

Information on unpacking and handling delivered units and accessories.

Outdoor Unit

Instructions for unpacking and removing accessories from the outdoor unit.

Indoor Unit

Instructions for unpacking and removing accessories from the indoor unit.

About the Units and Options

Overview: About the Units and Options

Information on identifying, combining units, and available options.

Identification

Details on identifying outdoor and indoor units via label information.

Combining Units and Options

Explains possible combinations of units and optional equipment.

Application Guidelines

Overview: Application Guidelines

Overview of system setup possibilities for space heating and DHW.

Setting up the Space Heating System

Guidelines for configuring space heating for single or multiple rooms.

Setting up the Domestic Hot Water Tank

Guidance on integrating and configuring the domestic hot water tank.

Setting up the Energy Metering

Instructions for setting up energy metering for produced heat and consumed energy.

Setting up the Power Consumption Control

Configuration for limiting the system's total power consumption.

Setting up an External Temperature Sensor

Instructions for connecting and configuring external temperature sensors.

Preparation

Overview: Preparation

Information on tasks and knowledge required before on-site installation.

Preparing Installation Site

Requirements and precautions for selecting and preparing the installation site.

Preparing Refrigerant Piping

Guidelines for preparing refrigerant piping, including material and diameter.

Preparing Water Piping

Requirements and precautions for preparing the water circuit and piping.

Preparing Electrical Wiring

Precautions and guidelines for connecting electrical wiring safely and correctly.

Installation

Overview: Installation

Describes the on-site tasks required for system installation.

Opening the Units

Instructions on how to open the outdoor and indoor units for access.

Mounting the Outdoor Unit

Steps and precautions for securely mounting the outdoor unit.

Mounting the Indoor Unit

Steps and precautions for securely mounting the indoor unit.

Connecting the Refrigerant Piping

Detailed guidelines for connecting refrigerant piping, including precautions.

Checking the Refrigerant Piping

Procedures for checking for leaks and performing vacuum drying.

Charging Refrigerant

Instructions and precautions for charging the system with refrigerant.

Connecting the Water Piping

Steps and precautions for connecting the water pipes and ensuring proper flow.

Connecting the Electrical Wiring

Guidelines for connecting electrical wiring to the outdoor and indoor units.

To Connect the Main Power Supply

Instructions for connecting the main power supply for normal and preferential rates.

To Connect the User Interface

Guide for installing and connecting the user interface.

Configuration

Overview: Configuration

Explains the importance and methods of system configuration.

To Connect the PC Cable to the Switch Box

Procedure for connecting a PC to the indoor unit for configuration.

To Access the Most Used Commands

Steps to access installer settings and overview settings via the user interface.

Basic Configuration

Guidance on initial system settings like language, date, time, and layout.

Space Heating Control

Settings for configuring space heating, including weather-dependent operation.

Domestic Hot Water Control

Configuration options for domestic hot water preparation methods.

Advanced Configuration/Optimization

Advanced settings for optimizing system performance and features.

Space Heating Operation: Advanced

Advanced settings for space heating, including preset temperatures and modulation.

Domestic Hot Water Control: Advanced

Advanced settings for DHW control, including disinfection and tank temperatures.

Heat Source Settings

Configuration for backup heater operation and auto emergency settings.

System Settings

Configuration of system priorities, auto-restart, and power supply settings.

Menu Structure: Overview User Settings

Hierarchical view of user-accessible settings on the interface.

Menu Structure: Overview Installer Settings

Hierarchical view of installer-accessible settings.

Commissioning

Overview: Commissioning

Describes the steps for commissioning the system after installation.

Precautions When Commissioning

Important safety precautions and operational notes before and during commissioning.

Checklist Before Commissioning

A detailed checklist of items to verify before starting the commissioning process.

Checklist During Commissioning

A checklist of tasks to perform during the commissioning phase.

To Check the Minimum Flow Rate

Procedure to verify minimum water flow rate for system operation.

Air Purge Function

Instructions for purging air from the water circuit for optimal performance.

To Perform a Test Run

Procedure for performing a system test run to check operation.

To Perform an Actuator Test Run

Procedure to test the operation of individual actuators like pumps and valves.

Underfloor Heating Screed Dryout

Functionality for drying screed in underfloor heating systems.

To Readout the Status of an Underfloor Heating Screed Dryout

How to check the current status of the screed dryout program.

To Interrupt an Underfloor Heating Screed Dryout

Procedure to manually stop the screed dryout program.

Hand-over to the User

Overview: Hand-over to the User

Key information to provide to the end-user after installation.

Maintenance and Service

Overview: Maintenance and Service

Introduction to yearly maintenance for indoor and outdoor units.

Maintenance Safety Precautions

Safety warnings and precautions for performing maintenance work.

Checklist for Yearly Maintenance of the Outdoor Unit

Checklist for annual maintenance tasks on the outdoor unit.

Checklist for Yearly Maintenance of the Indoor Unit

Checklist for annual maintenance tasks on the indoor unit.

Troubleshooting

Overview: Troubleshooting

Guide to identifying and solving problems based on symptoms and error codes.

Precautions When Troubleshooting

Safety warnings and precautions to follow during troubleshooting.

Solving Problems Based on Symptoms

Troubleshooting guide for common unit issues based on observed symptoms.

Symptom: The Unit is NOT Heating as Expected

Troubleshooting steps for when the unit fails to heat properly.

Symptom: The Compressor Does NOT Start

Troubleshooting steps when the compressor fails to start during operation.

Symptom: The Pump is Making Noise (Cavitation)

Troubleshooting steps for pump noise, potentially due to cavitation.

Symptom: The Pressure Relief Valve Opens

Troubleshooting steps when the pressure relief valve activates.

Symptom: The Water Pressure Relief Valve Leaks

Troubleshooting steps for leaks from the water pressure relief valve.

Symptom: The Space is NOT Sufficiently Heated at Low Outdoor Temperatures

Troubleshooting steps for insufficient heating at low ambient temperatures.

Solving Problems Based on Error Codes

Overview of error codes and their descriptions for troubleshooting.

Error Codes: Overview

Detailed list of error codes for outdoor and indoor units with descriptions.

Symptom: The Pressure at the Tapping Point is Temporarily Unusual High

Troubleshooting for unusual high pressure at the tapping point.

Symptom: Decoration Panels are Pushed Away Due to a Swollen Tank

Troubleshooting for swollen tanks affecting decoration panels.

Symptom: Tank Disinfection Function is NOT Completed Correctly (AH-error)

Troubleshooting AH errors related to incomplete tank disinfection.

Disposal

Overview: Disposal

General steps and legal requirements for system disposal.

To Pump Down

Procedure for pumping down refrigerant for relocation or disposal.

To Start and Stop Forced Cooling

Instructions for starting and stopping the forced cooling operation mode.

Technical Data

Overview: Technical Data

Information on dimensions, components, diagrams, and specifications.

Dimensions and Service Space

Detailed dimensions and required service space for outdoor and indoor units.

Center of Gravity

Information on the center of gravity for the outdoor unit.

Components

Lists and identifies the key components of the system.

Components: Outdoor Unit

Diagram and list of components within the outdoor unit.

Components: Switch Box (Outdoor Unit)

Diagram and list of components within the outdoor unit's switch box.

Components: Indoor Unit

Diagram and list of components within the indoor unit.

Components: Switch Box (Indoor Unit)

Diagram and list of components within the indoor unit's switch box.

Piping Diagram

Schematic diagrams illustrating the piping connections of the system.

Piping Diagram: Outdoor Unit

Schematic of the refrigerant and water piping within the outdoor unit.

Piping Diagram: Indoor Unit

Schematic of the refrigerant and water piping within the indoor unit.

Wiring Diagram

Electrical wiring diagrams for the outdoor unit and its components.

Wiring Diagram: Outdoor Unit

Detailed wiring diagram for the outdoor unit, including component labels.

Wiring Diagram: Indoor Unit

Diagram showing the internal wiring of the indoor unit and switch box.

Technical Specifications

Detailed technical specifications for outdoor and indoor units.

Technical Specifications: Outdoor Unit

Specifications for heating/cooling capacity, power input, COP, and EER.

Technical Specifications: Indoor Unit

Specifications for indoor units including heater, water volume, and electrical connections.

Operation Range

Defines the operating temperature ranges for heating, cooling, and DHW.

Operation Range: Heating and Cooling

Graphs showing operating ranges based on outdoor and water temperatures.

Operation Range: Domestic Hot Water

Graphs showing operating ranges for domestic hot water heating.

ESP Curve

External Static Pressure curves for indoor units, showing flow rate vs. pressure.

Glossary

Dealer

Sales distributor for the product.

Authorized Installer

Technical skilled person qualified to install the product.

User

Person who owns or operates the product.

Applicable Legislation

Directives, laws, and codes relevant to the product's domain.

Service Company

Qualified company that can perform or coordinate required service.

Installation Manual

Manual explaining how to install, configure, and maintain the product.

Operation Manual

Manual explaining how to operate the product.

Accessories

Items delivered with the product that need installation per documentation.

Optional Equipment

Equipment made or approved by Daikin that can be combined with the product.

Field Supply

Equipment not made by Daikin that can be combined with the product.

Field Settings Table

Applicable Indoor Units

List of indoor units for which the field settings table applies.

Notes

Notes referring to specific models or units within the table.

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Daikin Altherma ERLQ004-006-008CA User Manual

Table of Contents

Questions and Answers:

Daikin Altherma ERLQ004-006-008CA Specifications

Summary

General Safety Precautions

About the Documentation

About the Documentation

About This Document

Installer Reference Guide at a Glance

About the Box

Overview: About the Box

Outdoor Unit

Indoor Unit

About the Units and Options

Overview: About the Units and Options

Identification

Combining Units and Options

Application Guidelines

Overview: Application Guidelines

Setting up the Space Heating System

Setting up the Domestic Hot Water Tank

Setting up the Energy Metering

Setting up the Power Consumption Control

Setting up an External Temperature Sensor

Preparation

Overview: Preparation

Preparing Installation Site

Preparing Refrigerant Piping

Preparing Water Piping

Preparing Electrical Wiring

Installation

Overview: Installation

Opening the Units

Mounting the Outdoor Unit

Mounting the Indoor Unit

Connecting the Refrigerant Piping

Checking the Refrigerant Piping

Charging Refrigerant

Connecting the Water Piping

Connecting the Electrical Wiring

To Connect the Main Power Supply

To Connect the User Interface

Configuration

Overview: Configuration

To Connect the PC Cable to the Switch Box

To Access the Most Used Commands

Basic Configuration

Space Heating Control

Domestic Hot Water Control

Advanced Configuration/Optimization

Space Heating Operation: Advanced

Domestic Hot Water Control: Advanced

Heat Source Settings

System Settings

Menu Structure: Overview User Settings

Menu Structure: Overview Installer Settings

Commissioning

Overview: Commissioning

Precautions When Commissioning

Checklist Before Commissioning

Checklist During Commissioning

To Check the Minimum Flow Rate

Air Purge Function

To Perform a Test Run

To Perform an Actuator Test Run

Underfloor Heating Screed Dryout

To Readout the Status of an Underfloor Heating Screed Dryout

To Interrupt an Underfloor Heating Screed Dryout

Hand-over to the User

Overview: Hand-over to the User

Maintenance and Service

Overview: Maintenance and Service

Maintenance Safety Precautions

Checklist for Yearly Maintenance of the Outdoor Unit

Checklist for Yearly Maintenance of the Indoor Unit

Troubleshooting

Overview: Troubleshooting

Precautions When Troubleshooting

Solving Problems Based on Symptoms