Mitsubishi Electric PAC-IF071B-E User Manual (English)

Questions and Answers:

D
David SmithAug 23, 2025
How to troubleshoot a blank display on my Mitsubishi Electric PAC-IF071B-E?
- C
  Cheyenne JonesAug 23, 2025
  If the main remote controller display is blank, it could be due to a lack of power supply or a display issue. First, check LED2 on the FTC (Main). If it's lit, inspect the main remote controller wiring for damage or contact failure. If LED2 is blinking, further investigation is needed. If LED2 is off, additional troubleshooting steps are required. Also, check for any disconnection between the main remote controller cable and the FTC (Main) control board. If 'Please Wait' is not displayed, the main remote controller might be faulty. If 'Please Wait' is displayed, further investigation is needed.
H
hooverjohnAug 25, 2025
Why is my Mitsubishi Electric PAC-IF071B-E heating system not reaching the set temperature?
- M
  Melissa MendozaAug 26, 2025
  If the heating system isn't reaching the set temperature, several factors could be at play. Check if 'Prohibit', a schedule timer, or holiday mode is active, and adjust settings accordingly. Ensure the temperature sensor is in a representative location. The heat pump may not be working. The booster heater cut-out may have tripped. The booster heater breaker (ECB1) may have tripped. The booster heater thermal cut-out may have tripped and cannot be reset using the manual reset button. The heat emitter may be incorrectly sized. There may be a 3-way valve failure. There may be a battery problem (*wireless control only). If a mixing tank is installed, the flow rate between the mixing tank and the heat exchanger may be less than that between the mixing tank and the local system.
J
Jennifer FullerAug 27, 2025
Why has the water temperature in my Mitsubishi Electric Controller DHW tank dropped?
- C
  chelsea92Aug 27, 2025
  If the temperature of the DHW tank water has dropped, it could be due to water leakage in the pipes connecting to the DHW tank, loose or missing insulation, or a 3-way valve failure. Retighten the nuts holding the pipes onto the DHW tank, replace seal materials, or replace the pipes. Fix any loose insulation. Check the plumbing/wiring to the 3-way valve. Manually override 3-way valve using the main remote controller. Replace 3-way valve coil. Replace 3-way valve.
S
Steven Williams IIAug 27, 2025
What does it mean when LED4 is blinking on my Mitsubishi Electric PAC-IF071B-E?
- R
  Robert MartinAug 27, 2025
  If the LED4 on the FTC (Main) is blinking, it indicates a problem with the SD memory card. The card may be full of data, write-protected, not formatted, or formatted in the NTFS file system. Move or delete data, or replace the SD memory card with a new one. Release the write-protect switch. Use an SD memory card formatted in FAT file system, as the FTC is not compatible with NTFS.
L
Laura BakerAug 29, 2025
Why is my Mitsubishi Electric PAC-IF071B-E Controller leaking water?
- S
  shawn84Aug 29, 2025
  If water is leaking, it could be due to poorly sealed connections of water circuit components or water circuit components reaching the end of their life. Tighten connections as required.
R
ronnielongAug 30, 2025
What does it mean if LED2 is blinking on my Mitsubishi Electric PAC-IF071B-E Controller FTC (Main)?
- H
  Heather JohnsonAug 30, 2025
  If the LED2 on the FTC (Main) is blinking, and LED1 is also blinking, it indicates faulty wiring between the FTC (Main) and the outdoor unit. Check for faulty wiring between the FTC (Main) and the outdoor unit.
Q
qwardAug 31, 2025
Why is the LED4 on my Mitsubishi Electric PAC-IF071B-E FTC (Main) off?
- K
  Katie RobertsAug 31, 2025
  If the LED4 on the FTC (Main) is off, it may be because the SD memory card is not inserted correctly or you are not using an SD standards compliant memory card. Correctly insert the SD memory card in place until a click is heard. Use an SD standards compliant memory card.
E
Eric CunninghamSep 2, 2025
Why does water heating take longer with my Mitsubishi Electric PAC-IF071B-E?
- G
  George BellSep 2, 2025
  If the water heating is taking longer than usual, it could be due to several reasons. The heat pump may not be working, the booster heater cut-out might have tripped, or the booster heater breaker tripped. The booster heater thermal cut-out may have tripped and cannot be reset using the manual reset button. The immersion heater cut-out may have been triggered, or the immersion heater breaker tripped. There may also be a decreased flow rate in the DHW circuit (only when the external plate HEX for DHW is used).
A
Amy LeeSep 3, 2025
Why is there no water at the hot tap of my Mitsubishi Electric PAC-IF071B-E Controller?
- E
  Erin HansonSep 3, 2025
  If you have no water at the hot tap, it could be that the cold main is off or the strainer (local supply) is blocked. Check and open the stop cock. Isolate the water supply and clean the strainer.
C
cgrantSep 4, 2025
In 2-zone temperature control, why does only Zone2 not reach the set temperature on my Mitsubishi Electric PAC-IF071B-E Controller?
- D
  Dr. Kathryn GarciaSep 5, 2025
  In 2-zone temperature control, if only Zone2 does not reach the set temperature, it could be due to several reasons. When Zone1 and Zone2 are both in heating mode, the hot water temperature in Zone2 does not exceed that in Zone1. There may be faulty wiring of the motorized mixing valve, faulty installation of motorized mixing valve, incorrect setting of Running time, or motorized mixing valve failure. There is no action necessary.

Mitsubishi Electric PAC-IF071B-E Specifications

General

Brand	Mitsubishi Electric
Model	PAC-IF071B-E
Category	Controller
Language	English

Summary

Safety Precautions

1.1 Before Installation (Environment)

Precautions for selecting installation environment to prevent electric shock or unit damage.

1.2 Before Installation or Relocation

1.3 Before Electric Work

Essential checks and precautions for electrical wiring and grounding to prevent shock or fire.

Electrical Work

4.1 Electrical Connection

General guidelines and requirements for performing all electrical connections by qualified technicians.

Option 2: FTC (Main) Powered by Independent Source

Details the procedure for connecting the FTC (Main) unit to a separate power source.

4.2 Connecting the Main Remote Controller

Instructions for wiring and installing the main remote controller to the FTC unit and the wall.

4.3 Main Remote Controller Options

4.4 Connecting the Thermistor Cables

Guide on connecting various thermistors (room, pipe, water, tank) to the FTC controller for accurate temperature sensing.

4.5 Connecting Inputs/Outputs

Details how to connect external inputs (thermostats, switches) and outputs (pumps, valves) to the FTC controller.

4.6 Wiring for Heater

Dip Switch Setting

5.1 DIP Switch Functions

Overview of DIP switch locations and their functions for system configuration and operation.

5.2 Outdoor Unit Type

5.3 Functions Setting

Configuring system functions like boiler, DHW tank, immersion/booster heaters, mixing tank, and flow sensor via DIP switches.

5.4 Operation Setting

5.5 Emergency Mode (Heater Only Operation)

5.6 Emergency Mode (Boiler Operation)

Before Test Run

6.1 Check

Pre-test run checks for wiring, piping, power supply, and insulation resistance to ensure safety.

6.2 Self-Check

Procedure for checking and resetting error codes displayed on the FTC unit.

Main Remote Controller Operation

Initial Setting Wizard

Guide for the initial setup process when the remote controller is first powered on, including language and basic settings.

Main Settings Menu

Accessing and navigating the main settings menu, with user and installer level access distinctions.

DHW/Legionella Prevention

Legionella Prevention Mode Settings (LP Mode)

Service Menu

Accessing the service menu for advanced settings, diagnostics, and system adjustments, protected by a password.

Manual Operation

Performing manual control of system components like circulation pumps and valves for filling or maintenance.

Operation Settings

Troubleshooting

Troubleshooting by Inferior Phenomena

A comprehensive guide to identifying and resolving various fault symptoms and error codes displayed by the system.

Multiple Outdoor Units Control

9.1 Wiring for Multiple Outdoor Units Control

9.3 Electrical Connection

Essential electrical connection procedures for both FTC (Main) and FTC (Sub) units in multi-unit systems.

9.4 Main Remote Controller Wiring

9.5 Connecting the Thermistor Cables

Guide for connecting thermistors (TH2, THW1, THW2) to the FTC (Sub) controller for accurate temperature readings.

9.6 Dip Switch Functions

Setting DIP switches on FTC (Sub) units to match outdoor unit type and system configuration.

9.7 Connecting Inputs/Outputs

Basic Troubleshooting for Multiple Outdoor Units Control

Common issues and solutions for problems encountered with multiple outdoor unit systems and remote controller communication.

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Mitsubishi Electric PAC-IF071B-E User Manual

Table of Contents

Questions and Answers:

Mitsubishi Electric PAC-IF071B-E Specifications

Summary

Safety Precautions

1.1 Before Installation (Environment)

1.2 Before Installation or Relocation

1.3 Before Electric Work

Electrical Work

4.1 Electrical Connection

Option 2: FTC (Main) Powered by Independent Source

4.2 Connecting the Main Remote Controller

4.3 Main Remote Controller Options

4.4 Connecting the Thermistor Cables

4.5 Connecting Inputs/Outputs

4.6 Wiring for Heater

Dip Switch Setting

5.1 DIP Switch Functions

5.2 Outdoor Unit Type

5.3 Functions Setting

5.4 Operation Setting

5.5 Emergency Mode (Heater Only Operation)

5.6 Emergency Mode (Boiler Operation)

Before Test Run

6.1 Check

6.2 Self-Check

Main Remote Controller Operation

Initial Setting Wizard

Main Settings Menu

DHW/Legionella Prevention

Legionella Prevention Mode Settings (LP Mode)

Service Menu

Manual Operation

Operation Settings

Troubleshooting

Troubleshooting by Inferior Phenomena

Multiple Outdoor Units Control

9.1 Wiring for Multiple Outdoor Units Control

9.3 Electrical Connection

9.4 Main Remote Controller Wiring

9.5 Connecting the Thermistor Cables

9.6 Dip Switch Functions

9.7 Connecting Inputs/Outputs

Basic Troubleshooting for Multiple Outdoor Units Control

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