Mitsubishi Electric PAC-SIF051B-E Installation Manual

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English

FLOW TEMP. CONTROLLER [MASTER] (Cased)

PAC-IF051B-E

PAC-IF052B-E

FLOW TEMP. CONTROLLER [SLAVE] (Cased)

PAC-SIF051B-E

OPERATION MANUAL

For safe and correct use, please read this operation manual thoroughly before operating the FTC4 unit.

FOR USER

INSTALLATION MANUAL

For safe and correct use, read this manual thoroughly before installing the FTC4 unit.

FOR INSTALLER

Table of Contents

Other manuals for Mitsubishi Electric PAC-SIF051B-E

Installation And Operation Manual70 pages

Questions and Answers:

D
Danielle SmithSep 13, 2025
Why is the Mitsubishi Electric Temperature Controller main display blank?
- D
  David HendersonSep 13, 2025
  A blank display on your Mitsubishi Electric Temperature Controller can be due to a couple of reasons. First, there might be no power getting to the main controller. Check LED2 on the FTC4 (Master): if it's lit, there may be damage or a loose connection in the main controller wiring; if it's blinking, refer to point No. 5 in the manual; if it's off, refer to point No. 4 in the manual. Alternatively, power might be supplied, but the display isn't working. In this case, check for disconnections between the main controller cable and the FTC4 (Master) control board, or the main controller might be faulty if 'Please Wait' isn't showing. If 'Please Wait' is displayed, refer to point No. 2 in the manual.
S
Shawn MillerAug 25, 2025
Why is my Mitsubishi Electric Controller heating system not reaching the set temperature?
- K
  Kelly MyersAug 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.
C
Courtney HamiltonAug 26, 2025
Why has the water temperature in my Mitsubishi Electric Controller DHW tank dropped?
- P
  pamelagriffinAug 26, 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.
T
timothylawrenceAug 27, 2025
What does it mean when LED4 is blinking on my Mitsubishi Electric Controller?
- A
  aaron73Aug 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.
K
kleinkimberlyAug 28, 2025
Why is my Mitsubishi Electric PAC-SIF051B-E leaking water?
- A
  Anthony DavisAug 28, 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.
T
teresahannaSep 9, 2025
Why does the water circulation pump run for a short time unexpectedly on my Mitsubishi Electric Controller?
- S
  Stephanie WoodSep 9, 2025
  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.
P
perezmarkSep 8, 2025
Why is the heat pump on my Mitsubishi Electric PAC-SIF051B-E turning on and off repeatedly?
- E
  Eric PalmerSep 8, 2025
  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.
E
Elaine HarrisSep 8, 2025
Why does error L6 occur frequently during DHW or LP mode after cooling on my Mitsubishi Electric PAC-SIF051B-E Controller?
- J
  Jose BarnesSep 9, 2025
  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.
B
Brian LoganSep 3, 2025
Why doesn't the cooling system cool down to the set temperature on my Mitsubishi Electric PAC-SIF051B-E Controller?
- P
  phillipscharlesSep 3, 2025
  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.
K
keith30Sep 1, 2025
In 2-zone temperature control, why does only Zone2 not reach the set temperature on my Mitsubishi Electric PAC-SIF051B-E Controller?
- J
  jasonkimSep 1, 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-SIF051B-E Specifications

General

Brand	Mitsubishi Electric
Model	PAC-SIF051B-E
Category	Controller
Language	English

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