Brand: BOSCH
Category: Air Conditioner
Document Type: Manual
Language: EN
Manual for Cool 4000
Uploaded: April 20, 2026, 7:52 p.m.
Manual Publish Date: 2023-09-01
Warranty Information
This manual provides installation and operating instructions for the Bosch Cool 4000.
Operation Summary
This manual provides instructions for operating the Bosch Cool 4000 local air conditioner. It covers both control panel and remote controller operations. Key functions include:
- Mode Selection: Choose between Air Conditioning, Dehumidification, Fan, Auto, Silent, and Sleep modes.
- Temperature Control: Adjust the desired temperature using the up/down buttons or remote.
- Fan Speed: Select from Low, Medium, High, or Auto fan speeds.
- Swing Function: Activates the air outlet flap to distribute air evenly.
- Timer: Program delayed start-up or shut-down.
- Temperature Scale: Switch between Celsius (°C) and Fahrenheit (°F).
The manual also details installation, cleaning, maintenance, troubleshooting, and safety precautions.
Troubleshooting and error codes
Troubleshooting
| Problem | Possible cause | Possible solution |
|---|---|---|
| The appliance does not turn on when pressing ON/OFF button. | The appliance is not plugged in. There is no current. |
Plug in the appliance. Check if a circuit breaker has flipped off and in case reset circuit breaker. Otherwise wait. |
| An internal safety device prevents the appliance from being restarted until four minutes have elapsed since it was last turned off. | If you turn the appliance off wait 4 minutes to restart it. | |
| The appliance works for a short time only. | Room temperature is lower than the setting temperature. | Reset the setting temperature. |
| There are bends or kinks in the air exhaust hose. | Position the air exhaust hose correctly, keep it as short as possible and free of bends. | |
| The appliance turns on and off rapidly. | The air filter is soiled. | Turn off the appliance and clean the filter. |
| Something is preventing the air from being discharged. | Check and remove any obstacles obstructing air discharge. | |
| The appliance is working in air conditioning modes, but does not cool the room properly. | Unfavourable ambient conditions: windows, doors and/or curtains are open. | Close doors, windows and curtains. |
| Unfavourable ambient conditions: the room contains powerful heat sources. | Eliminate the heat sources. | |
| The air filter is soiled. | Turn off the appliance and clean the filter. | |
| Incorrect temperature setting. | Setting temperature should be lower than ambient temperature. | |
| Compressor shut-off. | Wait approximately 4 minutes and listen for compressor to restart when set in air conditioning mode. | |
| Unpleasant odours during operation. | Air intakes and/or air outlets are obstructed. | Check and remove any obstacles obstructing air in- or/and out takes. |
| The technical specification of the appliance is not adequate for the room size in which it is located. | Reconfirm that the cooling capacity is adequate for the room in which it is located. | |
| Unpleasant odours in the air may enter the appliances and spread. | Turn off the appliance and clean the filter. | |
| Dust is being discharged from the air outlet. | The air filter is soiled. | Turn off the appliance and clean the filter. |
| Dust may accumulate in the appliance if it is shut down for an extended period and not covered. | ||
| The appliance is noisy and vibrates too much. | The ground is not level. | Place the appliance on a flat, level surface. |
| The air filter is soiled. | Turn off the appliance and clean the filter. | |
| The appliance is noisy. | In order for the appliance to work, the appliance produces some noises that are considered normal. At the top of the appliance, a sound of rushing air being moved by the fan can be heard. High efficient compressors may occur high-pitched sound during air conditioning operation. A gurgling or hissing noise is normal during operation. This is caused by the flow of refrigerant. | |
| The remote control does not turn on. | The batteries are empty. | Replace the batteries. |
| The appliance does not receive signal from the remote control. | The signal between the remote control and signal receiver is interrupted. | The remote control must be no more than 5 meters away from the appliance without obstacles between the remote control and the appliance. |
| The error messages FL, E2, E4, E6. E7 appear on the display. | The appliance has a self diagnosis system to identify a number of malfunctions. | → Chapter 8.1 "Self-diagnosis", Page 22 |
Self-diagnosis
| Error code | Description | Solution |
|---|---|---|
| FL | Internal tank full | Empty the internal tank (→Chapter 6.3.2 "Draining the internal tank", Page 19). If the Error code continues to appear despite the internal tank being empty, please contact an authorized service technician. |
| E2 | Sensor failure | Please contact an authorized service technician. |
| E4 | Sensor failure | Please contact an authorized service technician. |
| E6 | Motor failure | Please contact an authorized service technician. |
| E7 | PCB failure | Please contact an authorized service technician. |