Mitsubishi Electric PAC-IF082B-E

Questions and Answers

L
Laura WrightNov 27, 2025
Why is LED2 on my Mitsubishi Electric PAC-IF082B-E FTC (Main) off?
- B
  burkedavidNov 27, 2025
  When LED1 on FTC (Main) is also off, the possible causes are: * The outdoor unit is not supplied at the rated voltage. Check the voltage across the terminals L and N or L3 and N on the outdoor power board. When the voltage is not 220 to 240 V AC, check wiring of the outdoor unit and of the breaker. When the voltage is at 220 to 240 V AC, check the voltage across the outdoor unit terminals S1 and S2. * Defective outdoor controller circuit board. Check the voltage across the outdoor unit terminals S1 and S2. When the voltage is not 220 to 240 V AC, check the fuse on the outdoor control board and check for faulty wiring. When the voltage is 220 to 240 V AC, check the voltage across the indoor unit terminals S1 and S2. * FTC (Main) is not supplied with 220 to 240V AC. Check the voltage ...
A
amy98Aug 25, 2025
Why is my Mitsubishi Electric Controller noisy?
- R
  rhaneyAug 26, 2025
  A noisy water circulation pump in your Mitsubishi Electric Controller system is caused by air in the water circulation pump. Use manual and automatic air vents to remove air from the system. Top up water if necessary to achieve 1 bar on primary circuit.
J
Jessica LoweAug 29, 2025
What does it mean if LED4 on Mitsubishi Electric PAC-IF082B-E Controller FTC (Main) is blinking?
- H
  Heather ReevesAug 29, 2025
  If LED4 on the FTC (Main) of your Mitsubishi Electric Controller is blinking, it indicates a problem with the SD memory card: * Full of data: Move or delete data, or replace microSD memory card with a new one. * Write-protected: Release the write-protect switch. * NOT formatted: Refer to "4.11 Using microSD memory card". * Formatted in NTFS file system: FTC is not compatible with NTFS flie system. Use a microSD memory card formatted in FAT file system.
L
Lance AdamsAug 30, 2025
Why does my Mitsubishi Electric PAC-IF082B-E Controller have no hot water at the hot tap?
- C
  Christina FlemingAug 30, 2025
  If there's no hot water at the tap with your Mitsubishi Electric Controller, the possible causes are: * Cold main off: Check and open stop cock. * Strainer (local supply) blocked: Isolate water supply and clean strainer.
M
Martha RomanSep 19, 2025
Why doesn't the cooling system cool down to the set temperature with Mitsubishi Electric PAC-IF082B-E?
- S
  Sharon ScottSep 22, 2025
  If the cooling system on your Mitsubishi Electric Controller isn't cooling down to the set temperature, it could be due to: * When the water in the circulation circuit is unduly hot, Cooling mode starts with a delay for the protection of the outdoor unit. Normal operation. * When the outdoor temperature is lower than the preset temperature below which the freeze stat. function is activated, Cooling mode does not start running. To run Cooling mode overriding the freeze stat. function, adjust the preset temperature below which the freeze stat. function is activated.
E
Erika WilliamsSep 16, 2025
Why is FTC unit running in the DHW mode after power recovery with Mitsubishi Electric PAC-IF082B-E?
- G
  Garrett MillsSep 16, 2025
  The FTC unit is designed to run in an operation mode with a higher priority (i.e. DHW mode in this case) at power recovery. Normal operation. After the DHW max. operation time has elapsed or the DHW max. temperature has been reached, the DHW mode switches to the other mode (ex. heating mode).
M
Mr. Curtis Sampson Jr.Sep 18, 2025
Why is cooling mode NOT available on my Mitsubishi Electric Controller?
- E
  evaughanSep 18, 2025
  If cooling mode is not available on your Mitsubishi Electric Controller, DIP SW2-4 is OFF. Turn DIP SW2-4 to ON. (Refer to “5.1 DIP switch functions” in this manual.)
S
sharrisonSep 9, 2025
Why does water discharge from the pressure relief valve (Primary circuit) in Mitsubishi Electric PAC-IF082B-E Controller?
- J
  Julie FuentesSep 9, 2025
  If water is discharging from the pressure relief valve (primary circuit) in your Mitsubishi Electric Controller, it could be due to: * If continual – pressure relief valve may be damaged. Turn the handle on the pressure relief valve to check for foreign objects in it. If the problem is not still solved, replace the pressure relief valve with a new one. * If intermittent – expansion vessel charge may have reduced/bladder perished. Check pressure in expansion vessel. Recharge to 1 bar if necessary. If bladder perished replace expansion vessel with a new one.
G
Gregory EdwardsSep 7, 2025
Why does only Zone 2 not reach the set temperature in Mitsubishi Electric Controller?
- E
  Elizabeth GonzalezSep 7, 2025
  For a Mitsubishi Electric Controller with 2-zone temperature control, if only Zone 2 isn't reaching the set temperature, consider these factors: * When Zone 1 and Zone 2 are both in heating mode, the hot water temperature in Zone 2 does not exceed that in Zone 1. Normal operation no action necessary. * Faulty wiring of motorized mixing valve. Refer to "4.7 Wiring for 2-zone temperature control". * Faulty installation of motorized mixing valve. Check for correct installation. (Refer to the manual included with each motorized mixing valve.) * Incorrect setting of running time. Check for correct setting of running time. * Motorized mixing valve failure. Inspect the mixing valve.
E
Erika GonzalezSep 8, 2025
Why does the room temperature rise during DHW operation with Mitsubishi Electric PAC-IF082B-E?
- N
  Nancy ThompsonSep 8, 2025
  If the room temperature rises during DHW operation with your Mitsubishi Electric Controller, the 3-way valve may have failed. Check the 3-way valve.

Summary

1. Safety Precautions

1.1 Before Installation (Environment)

Precautions for installing the FTC unit in various environments to prevent damage or breakdown.

1.2 Before Installation or Relocation

Precautions to observe when moving the FTC unit to prevent injury or damage.

1.3 Before Electric Work

Safety precautions related to electrical work, including circuit breakers and wiring.

1. Safety Precautions (Continued)

1.4 Before Starting the Test Run

Precautions to take before initiating the FTC unit's test run to prevent damage.

1.5 Electric Booster and Immersion Heaters

Requirements for electric heaters used on the water circuit to prevent overheating.

2. Installing the FTC Unit

2.1 Check the Parts

List of supplied FTC unit components and instructions for checking them.

2.2 Choosing the FTC Unit Installation Location

Guidelines for selecting an appropriate installation location for the FTC unit.

2.3 Installing the FTC Unit

Step-by-step instructions for physically installing the FTC unit.

4. Electrical Work

4.1 Electrical Connection

General instructions and diagrams for electrical connections and wiring.

4.2 Connecting the Main Remote Controller

Instructions for connecting the main remote controller cable and its installation.

4.3 Main Remote Controller Options

Options for connecting remote controllers and sensors for 1-zone and 2-zone control.

4.4 Connecting the Thermistor Cables

Instructions for connecting various thermistor cables to the FTC controller.

4. Electrical Work (Continued)

4.5 Connecting Inputs;Outputs

Details on connecting signal inputs and outputs to the FTC controller.

4.10 Installation Procedure for DHW Tank

Step-by-step procedure for installing a DHW tank and related components.

4.6 Wiring for Heater

Wiring instructions for booster and immersion heaters.

4.11 Forced Cooling Mode Input (IN13)

4.7 Wiring for 2-Zone Temperature Control

Wiring for mixing valves and thermistors in a 2-zone temperature control setup.

4.12 Using microSD Memory Card

4.8 2-Zone Valve ON;OFF Control

Instructions for implementing 2-zone control using 2-way valves.

5. DIP Switch Setting

5.1 DIP Switch Functions

5.2 Outdoor Unit Type

5.3 Functions Setting

5.4 Operation Setting

5. DIP Switch Setting (Continued)

5.5 Emergency Mode (Heater Only Operation)

5.6 Emergency Mode (Boiler Operation)

5.7 Indoor Unit Only Operation

9. Troubleshooting

Troubleshooting by Inferior Phenomena

Table of fault symptoms, possible causes, and suggested solutions.

10. Multiple Outdoor Units Control

10.1 Wiring for Multiple Outdoor Units Control

10.2 Pipe Work

10.3 Electrical Connection

10.4 Main Remote Controller Wiring

10. Multiple Outdoor Units Control (Continued)

10.5 Connecting the Thermistor Cables

Basic Troubleshooting for Multiple Outdoor Units Control

10.6 DIP Switch Functions

10.6 DIP Switch Functions (Continued)

10.7 Connecting Inputs;Outputs