Brand: FUJITSU Halcyon
Category: Air Conditioner
Manual Type:
Language:
Manual for INVERTER - Troubleshooting and error codes + PDF Download
Uploaded: April 8, 2025, 1:51 p.m.
Warranty Summary
No warranty information found in this operating manual.
To Select Mode Operation: Press START/STOP, then MODE to choose AUTO, COOL, DRY, HEAT, or FAN.
Set Thermostat: Use SET TEMP. buttons to adjust desired temperature.
Set Fan Speed: Press FAN button to cycle through AUTO, HIGH, MED, LOW, QUIET.
SUPER QUIET Operation: Select QUIET fan speed for reduced airflow and quieter operation.
To Stop Operation: Press START/STOP button again.
TIMER Operation: Use TIMER MODE and TIMER SET buttons to set ON/OFF times or program timer sequences.
SLEEP TIMER Operation: Press SLEEP button to activate sleep timer which adjusts temperature automatically before turning off.
Troubleshooting and error codes
| Symptom | Problem | See Page |
|---|---|---|
| Doesn't operate immediately: | If the indoor unit is stopped and then immediately started again, the compressor will not operate for about 3 minutes, in order to prevent fuse blowouts. Whenever the electrical breaker is turned off then on again the protection circuit will operate for about 3 minutes, preventing unit operation during that period. |
— |
| Noise is heard: | During operation or immediately after stopping the unit, the sound of water flowing in the air conditioner's piping may be heard. Also, noise may be particularly noticeable for about 2 to 3 minutes after starting operation (sound of refrigerant flowing). During operation, a slight squeaking sound may be heard. This is the result of minute expansion and contraction of the front panel due to temperature changes. During Heating operation, a sizzling sound may be heard occasional. This sound is produced by the Automatic Defrosting operation. |
17 |
| Smells: | Some smell may be emitted from the indoor unit. This smell is the result of room smells (furniture, tobacco, etc.) which have been taken into the indoor unit. | — |
| Mist or steam is emitted: | During Cooling or Dry operation, a thin mist may be seen emitted from the indoor unit. This results from the sudden Cooling of room air by the cool air emitted from the indoor unit, resulting in condensation and misting. During Heating operation, the outdoor unit's fan may stop, and steam may be seen rising from the unit. This is due to Automatic Defrosting operation. |
17 |
| Airflow is weak or stops: | When Heating operation is started, fan speed is temporarily very low, to allow internal parts to warm up. During Heating operation, if the room temperature rises above the thermostat setting, the outdoor unit will stop, and the indoor unit will operate at very low fan speed. If you wish to warm the room further, set the thermostat for a higher setting. During Heating operation, the indoor unit will temporarily stop operation (between 7 and 15 minutes) as the Automatic Defrosting mode operates. During Automatic Defrosting operation, the OPERATION Indicator Lamp will flash. During Dry mode, the indoor unit will operate at low speed; in order to adjust room humidity, the indoor unit's fan may stop from time to time. Also, the fan may operate at very low speed when adjusting room humidity. During SUPER QUIET operation, the fan will operate at very low speed. In the monitor of AUTO operation, the fan will operate at very low speed. In case of Multi-type unit, if multiple units are operated in different operation modes as shown below, the units operated afterward will stop and the OPERATION indicator lamp (green) will flash. Heating mode and cooling mode (or dry mode) Heating mode and fan mode |
6, 7, 17, 18 |
| Water is produced from the outdoor unit: | During Heating operation, water may be produced from the outdoor unit due to Automatic Defrosting operation. | 17 |
Troubleshooting and error codes
| Symptom | Problem | See Page |
|---|---|---|
| Doesn't operate immediately: | If the indoor unit is stopped and then immediately started again, the compressor will not operate for about 3 minutes, in order to prevent fuse blowouts. Whenever the electrical breaker is turned off then on again the protection circuit will operate for about 3 minutes, preventing unit operation during that period. |
— |
| Noise is heard: | During operation or immediately after stopping the unit, the sound of water flowing in the air conditioner's piping may be heard. Also, noise may be particularly noticeable for about 2 to 3 minutes after starting operation (sound of refrigerant flowing). During operation, a slight squeaking sound may be heard. This is the result of minute expansion and contraction of the front panel due to temperature changes. During Heating operation, a sizzling sound may be heard occasional. This sound is produced by the Automatic Defrosting operation. |
17 |
| Smells: | Some smell may be emitted from the indoor unit. This smell is the result of room smells (furniture, tobacco, etc.) which have been taken into the indoor unit. | — |
| Mist or steam is emitted: | During Cooling or Dry operation, a thin mist may be seen emitted from the indoor unit. This results from the sudden Cooling of room air by the cool air emitted from the indoor unit, resulting in condensation and misting. During Heating operation, the outdoor unit's fan may stop, and steam may be seen rising from the unit. This is due to Automatic Defrosting operation. |
17 |
| Airflow is weak or stops: | When Heating operation is started, fan speed is temporarily very low, to allow internal parts to warm up. During Heating operation, if the room temperature rises above the thermostat setting, the outdoor unit will stop, and the indoor unit will operate at very low fan speed. If you wish to warm the room further, set the thermostat for a higher setting. During Heating operation, the indoor unit will temporarily stop operation (between 7 and 15 minutes) as the Automatic Defrosting mode operates. During Automatic Defrosting operation, the OPERATION Indicator Lamp will flash. During Dry mode, the indoor unit will operate at low speed; in order to adjust room humidity, the indoor unit's fan may stop from time to time. Also, the fan may operate at very low speed when adjusting room humidity. During SUPER QUIET operation, the fan will operate at very low speed. In the monitor of AUTO operation, the fan will operate at very low speed. In case of Multi-type unit, if multiple units are operated in different operation modes as shown below, the units operated afterward will stop and the OPERATION indicator lamp (green) will flash. Heating mode and cooling mode (or dry mode) Heating mode and fan mode |
6, 7, 17, 18 |
| Water is produced from the outdoor unit: | During Heating operation, water may be produced from the outdoor unit due to Automatic Defrosting operation. | 17 |