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Heather JamesSep 23, 2025
How to enable cooling mode on Mitsubishi Electric Controller?
- JJeremy PerrySep 23, 2025
Turn Dip SW2-4 to ON.
How to enable cooling mode on Mitsubishi Electric Controller?
Turn Dip SW2-4 to ON.
Why is my Mitsubishi Electric PAC-IF073B-E heating system not reaching the set temperature?
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.
Why has the water temperature in my Mitsubishi Electric PAC-IF073B-E Controller DHW tank dropped?
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.
What does it mean when LED4 is blinking on my Mitsubishi Electric PAC-IF073B-E?
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.
Why is my Mitsubishi Electric PAC-IF073B-E Controller leaking water?
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.
Why does the water circulation pump run for a short time unexpectedly on my Mitsubishi Electric PAC-IF073B-E?
If the water circulation pump runs for a short time unexpectedly, it is due to the water circulation pump jam prevention mechanism (routine) to inhibit the build-up of scale.
Why is the heat pump on my Mitsubishi Electric PAC-IF073B-E turning on and off repeatedly?
If the heat pump is forced to turn ON and OFF, it is because the smart grid ready input (IN11 and IN12) is used, and switch-on and off commands are input.
Why does error L6 occur frequently during DHW or LP mode after cooling on my Mitsubishi Electric Controller?
If during DHW or LP mode following the cooling mode, error L6 (circulation water freeze protection) occurs and operation stops frequently, it is because the preset temperature below which the freeze stat. function is activated is low, error L6 is more likely to occur interruption operation before the freeze stat. function is activated. Adjust the preset temperature below which the freeze stat. function is activated.
Why doesn't the cooling system cool down to the set temperature on my Mitsubishi Electric PAC-IF073B-E Controller?
If the cooling system does not cool down to the set temperature, it could be because the water in the circulation circuit is unduly hot, causing Cooling mode to start with a delay to protect the outdoor unit. It could also be because the outdoor temperature is lower than the preset temperature below which the freeze stat. function is activated, preventing Cooling mode from starting. To run Cooling mode overriding the freeze stat. function, adjust the preset temperature below which the freeze stat. function is activated.
In 2-zone temperature control, why does only Zone2 not reach the set temperature on my Mitsubishi Electric PAC-IF073B-E Controller?
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.
General| Model | PAC-IF073B-E |
|---|---|
| Category | Controller |
| Type | Interface |
| Communication Protocol | M-NET |
| Operating Temperature | -10°C to +50°C |
| Storage Temperature | -20°C to +60°C |
| Compatibility | Mitsubishi Electric Air Conditioners |
| Function | Control and monitoring of air conditioning systems |
Precautions for installing the FTC unit based on environmental factors like water, wind, or combustible gases.
Guidelines for safely moving and installing the FTC unit, emphasizing packaging and handling.
Precautions for electrical connections, circuit breakers, and grounding to prevent shock or fire.
Verifies the included parts for the FTC unit installation, listing components and quantities.
Criteria for selecting an appropriate installation site, considering environmental factors and accessibility.
Step-by-step instructions for physically mounting the FTC unit, including screw usage and cover removal.
Describes system configurations involving DHW tank, immersion heater, booster heater, and their functions.
Specifies required parts like flow switches, valves, and pumps, along with their electrical requirements.
Procedures for connecting the main remote controller cable to the FTC unit and installing the controller.
Instructions for connecting various thermistor cables (TH1, TH2, THW1, THW2, THW5B) to the FTC unit.
Details signal inputs and outputs for connecting external devices like pumps, valves, sensors, and meters.
Explains the location and function of DIP switches on the FTC printed circuit board for system configuration.
Details DIP switch settings for various system functions like boilers, DHW tanks, immersion heaters, and booster heaters.
Configuration options via DIP switches for remote controllers, flow sensors, cooling modes, and automatic backup.
Overview of the main remote controller's parts, screen layout, and basic functions.
Detailed diagram illustrating the hierarchical menu structure for accessing various controller functions and settings.
Configuration options for DHW tank heating and legionella prevention modes, including settings for temperature and time.
Settings related to heating operation, such as flow temperature range, room temperature control, and heat pump adjustments.
A comprehensive list of fault symptoms, possible causes, and explanations/solutions for common issues.
Details electrical connection procedures for FTC (Main) and FTC (Sub) units, including power supply options.
Troubleshooting guide for common issues encountered with multiple outdoor unit configurations.
