Electronic Functions; Abbreviation; Display Function; Main Protection - Bosch Climate 5000 Series Service Manual

1 2 | Bosch Climate 5000 Series Ductless Air Conditioner / Heat Pump Outdoor Unit

5 Electronic Functions

5.1 Abbreviation

T1: Indoor room temperature
T2: Coil temperature of evaporator
T3: Coil temperature of condenser
T4: Outdoor ambient temperature
T5: Compressor discharge temperature
Ts: Room temperature setting
Td: Off-set value (Td is an advanced feature)

5.2 Display Function

5.2.1 Icon explanation on indoor display board.
Digital display:
Display window
turbo defrost
defrost: when defrosting (cooling & heating units)
run: when the unit is operational
timer: when Timer is set
turbo: when Turbo feature is turned on
auto: when Auto mode is activated
display the temperature setting or room temperature.
When error occurs, it displays error code. For some
units, it can display the following functions:
for 3 seconds when:
• TIMER ON is set
• FRESH, SWING, TURBO, or SILENCE feature is turned on
for 3 seconds when:
• TIMER OFF is set
• FRESH, SWING, TURBO, or SILENCE feature is turned off
when anti-cold air feature is turned on
when defrosting (cooling & heating units)
when unit is self-cleaning (Single Zone system only)
when 8 ° C heating feature is turned on
Figure 8
A guide on using the infrared remote is not included in this literature
package. A separate user guide is available for the remote operations.
Data subject to change
run timer
Display may look different depending on IDU type.
Display is not available with Compact Cassette (9K, 12K &
18k) indoor model.
Ducted indoor model may have display; however, due to
installation set up, it may not be visible.
Please use Wired Wall Thermostat (optional accessory) to
check system information easily.

5.3 Main Protection

5.3.1 Three minutes delay at restart for compressor
1 minute delay for the 1st time start-up and 3 minutes delay for others.
5.3.2 Temperature protection of compressor discharge
Compressor discharge temp. T5> 239 °F (115°C) for 5s, compressor stops.
5.3.3 Fan speed is out of control
When indoor fan speed runs too low (300RPM) for certain time, the unit will stop
and the LED will display the failure.
5.3.4 Inverter module protection
The Inverter module has a protection function for current, voltage and temperature.
If these protections happen, the corresponding code will display on indoor unit and
the unit will stop working.
5.3.5 Indoor fan delay open function
When the unit starts up, the louver will be active immediately and the indoor fan
will open 7s later. If the unit is running in heating mode, the indoor fan will be also
controlled by anti-cold air function.
5.3.6 Compressor preheating functions
Preheating permitting condition:
When T4 (outdoor ambient temperature) 37.4 °F (3°C), the preheating function
will be activated.
5.3.7 Sensor protection at open circuit and breaking disconnection.
When there's only one temperature sensor malfunction, the system will keep
working but show the error code, in case of any emergency use.
When there's more than one temperature sensor malfunctioning, the system will
stop working.
Service Manual
04.2020 | Bosch Thermotechnology Corp.