Brand: HITACHI
Category: Air Conditioner
Document Type: Manual
Language: EN
Available Languages: EN , ES
Manual for FSXN
Uploaded: Nov. 21, 2025, 8:10 p.m.
Manual Publish Date: 2010-12-01
The FSXN series belongs to the SET FREE series, characterized by its modular design. It offers refrigeration, heating, or both simultaneously, for personalized environments. The units are designed with environment-friendly R410A gas refrigerant and adhere to RoHS and Green Dot standards. This manual covers installation, piping, electrical wiring, control systems, optional functions, test runs, troubleshooting, spare parts, servicing, electrical checks, and maintenance notes for the FSXN series outdoor units and associated CH units.
Troubleshooting and error codes
| No. | Check item | Action | Judgement | |
|---|---|---|---|---|
| 1 | Is the service space sufficient? | Yes | No | |
| 2 | Is there a short circuit in the discharge air? | Yes | No | |
| 3 | Any heat influence? | Yes | No | |
| 4 | Is the earth wire connected? | Yes | No | |
| 5 | Refrigerant pipe | Correct | Incorrect | |
| 6 | Fixing of units | Correct | Incorrect | |
| 7 | Are the internal and external surfaces damaged? | Yes | No | |
| 8 | Are the screws and bolts tightened? | Tighten if loose. | Tightened | Not tightened |
| 9 | Are the terminal screws tightened? | Tighten the screws on the terminals with a Philips screwdriver. | Tightened | Not tightened |
| 10 | Are the compressor terminals tightened? | Push all the terminals. | Push | Not push |
| 11 | Insulation resistance | Measure the insulation resistance with a multimeter. Fan and compressor: Motor: greater than 3 MΩ. Others: greater than 3 MΩ. | Correct | Incorrect |
| 12 | Are there drainage problems in the water flow? | Check the smoth flow with a little water. | Correct | Incorrect |
| 13 | Is there leakage in the compressor? | Check there is no leakage. | Correct | Incorrect |
| 14 | Is there leakage in the outdoor heat exchanger? | Check there is no leakage. | Correct | Incorrect |
| 15 | Is there leakage in the indoor heat exchanger? | Check there is no leakage. | Correct | Incorrect |
| 16 | Is there leakage in the 4-way valves? | Check there is no leakage. | Correct | Incorrect |
| 17 | Is there leakage in the check valve? | Check there is no leakage. | Correct | Incorrect |
| 18 | Is there leakage in the accumulator? | Check there is no leakage. | Correct | Incorrect |
| 19 | Is there leakage in the strainer? | Check there is no leakage. | Correct | Incorrect |
| 20 | Is there leakage in the expansion valve? | Check there is no leakage. | Correct | Incorrect |
| 21 | Is there leakage in the piping? | Check there is no leakage. | Correct | Incorrect |
| 22 | Check the direction of the fans | See the air flow volume. | Correct | Incorrect |
| 23 | Check the voltage of each phase | Greater than 220 V. | Correct | Incorrect |
| 24 | Vibrations and noise | Check the compressor, the piping, the fan, etc. | Correct | Incorrect |
| 25 | Activation of the operation modes | Activate the COOL switch, the HEAT switch, the STOP switch and the TEMP switch. | Correct | Incorrect |
| 26 | Cut-out of the high pressure switch | Check the current activation valve. | Correct | Incorrect |
| 27 | Activate the drain-up mechanism | Check it is activated during cooling mode. | Correct | Incorrect |
| 28 | Indoor inlet air temperature DB/WB | — | (°C) DB | (°C) WB |
| 29 | Indoor outlet air temperature DB/WB | — | (°C) DB | (°C) WB |
| 30 | Outdoor inlet air temperature DB/WB | — | (°C) DB | (°C) WB |
| 31 | Outdoor outlet air temperature DB/WB | — | (°C) DB | (°C) WB |
| 32 | High pressure switch | MPaG | ||
| 33 | Low pressure switch | MPaG | ||
| 34 | Operating voltage | — | V | |
| 35 | Operating current | — | A | |
| 36 | Instructions for the customer for cleaning the filters | — | Done | Not yet |
| 37 | Instructions for the customer for the cleaning procedure | — | Done | Not yet |
| 38 | Instructions for the customer for operation | — | Done | Not yet |