Brand: BOSCH
Category: Air Conditioner
Document Type: Manual
Language: EN
Manual for Climate 8000i/8100i
Uploaded: Nov. 21, 2025, 6:30 p.m.
Manual Publish Date: 2021/05
Operation Summary
This manual details the functions and operation of protective procedures for the Bosch Climate 8000i/8100i air conditioning systems. It covers:
- Control Functions: Restart control, freeze prevention, overheat prevention, start-up control, and fan delay.
- Protection Device Functions: Details on various error conditions related to fan operation, thermistors, DC/AC current, PAM, and serial communication.
- Thermistor Characteristics: Resistance and temperature data for indoor and outdoor unit thermistors.
- Troubleshooting: Flowcharts and procedures for diagnosing and resolving error codes such as Cycle error, Outdoor unit fan motor error, Compressor rotation error, PAM error, Serial errors, and WLAN errors.
- Disassembly Procedures: Instructions for taking apart the indoor and outdoor units for servicing.
- Environmental Protection: Information on responsible disposal of the product and its components.
Troubleshooting and error codes
| Function | Operation | Description | Detection period | Reset condition | Indoor unit error display | Self-diagnosis result display Indoor Outdoor unit unit |
| 1 | Indoor unit fan lock | Operation stops if there is no input of rotation pulse signal from indoor unit fan motor for 1 minute. | When indoor unit fan is in operation | Operation OFF or ON | None | Yes None |
| 2 | Indoor unit fan rotation speed error | Operation stops if rotation pulse signal from indoor unit fan indicates abnormally low speed (about 300 rpm or slower). | When indoor unit fan is in operation | Operation OFF or ON | None | Yes None |
| 3 | 2-way valve freeze prevention | Compressor stops if temperature of outdoor unit 2-way valve remains below 0 °C for 10 continuous minutes during cooling or dehumidifying operation. | When in cooling or dehumidifying operation | Automatic reset when temperature of 2-way valve rises above 10 °C. | None | None Yes |
| 3 | Outdoor unit heat exchanger overheat shut down | Operation frequency lowers if outdoor unit heat exchanger temperature exceeds about 55 °C during cooling operation. | When in cooling or dehumidifying operation | Automatic reset after safety period (180 sec). | None | None Yes |
| 4 | Compressor discharge overheat shut down | Compressor stops if outdoor unit heat exchanger temperature exceeds about 55 °C for 120 seconds at minimum frequency. | When compressor is in operation | Automatic reset after safety period (180 sec). | None | None Yes |
| 5 | Dehumidifying operation temporary stop | Compressor stops if outside air temperature thermistor is lower than about 16 °C during dehumidifying operation. | When in dehumidifying operation | Automatic reset when outside air temperature rises above 16 °C. | None | None Yes |
| 6 | DC over current error | Compressor stops if DC current of about 20 A or higher flows in IPM. | When compressor is in operation | Operation OFF or ON | Only after outdoor unit restarts eight times (complete shutdown). | Yes Yes |
| 7 | AC over current error | Operating frequency lowers if outdoor AC current exceeds peak control current value. Compressor stops if compressor AC current exceeds peak control current value at minimum frequency. | When compressor is in operation | Operation OFF or ON | Only after outdoor unit restarts four times (complete shutdown). | Yes Yes |
| 8 | AC over current error in compressor OFF status | AC current exceeds about 3 A while compressor is in non-operation status. | When compressor is in non-operation | Replacement of defective parts such as IPM | After a single error judgment (complete shutdown). | Yes Yes |
| 9 | AC maximum current error | Compressor stops if outdoor AC current exceeds 17 A. | When compressor is in operation | Operation OFF or ON | After a single error judgment (complete shutdown). | Yes Yes |
| 10 | AC current deficiency error | Compressor stops if operating frequency is 50 Hz or higher and compressor AC current is about 2.0 A or lower. | When compressor is in operation | Operation OFF or ON | Only after outdoor unit restarts four times (complete shutdown). | Yes Yes |
| 11 | Thermistor installation error or 4-way valve error | Compressor stops if high and low values of temperatures detected by outdoor unit heat exchanger thermistor (TH2) and 2-way valve thermistor (TH5) do not match operating cycle. | 3 minutes after compressor start up | Operation OFF or ON | Only after outdoor unit restarts four times (complete shutdown). | Yes Yes |
| 12 | Compressor high temperature error | Compressor stops if compressor discharge thermistor (TH1) exceeds about 114 °C, or if there is short-circuit in TH1. | When in operation | Operation OFF or ON | Only after outdoor unit restarts four times (complete shutdown). | Yes Yes |
| 13 | Outdoor unit heat exchanger thermistor short-circuit error | Compressor stops if there is short circuit in outdoor unit heat exchanger thermistor (TH2). | At compressor start up | Operation OFF or ON | Only after outdoor unit restarts four times (complete shutdown). | Yes Yes |
| 14 | Outdoor unit outside air temperature thermistor short-circuit error | Compressor stops if there is short circuit in outdoor unit outside air temperature thermistor (TH3). | At compressor start up | Operation OFF or ON | Only after outdoor unit restarts four times (complete shutdown). | Yes Yes |
| 15 | Outdoor unit suction thermistor short-circuit error | Compressor stops if there is short circuit in outdoor unit suction thermistor (TH4). | At compressor start up | Operation OFF or ON | Only after outdoor unit restarts four times (complete shutdown). | Yes Yes |
| 16 | Outdoor unit 2-way valve thermistor short-circuit error | Compressor stops if there is short circuit in outdoor unit 2-way valve thermistor (TH5). | At compressor start up | Operation OFF or ON | Only after outdoor unit restarts four times (complete shutdown). | Yes Yes |
| 17 | Outdoor unit heat exchanger thermistor open-circuit error | Compressor stops if there is open circuit in outdoor unit heat exchanger thermistor (TH2). | At compressor start up | Operation OFF or ON | Only after outdoor unit restarts four times (complete shutdown). | Yes Yes |
| 18 | Outdoor unit outside air temperature thermistor open-circuit error | Compressor stops if there is open circuit in outdoor unit outside air temperature thermistor (TH3). | At compressor start up | Operation OFF or ON | Only after outdoor unit restarts four times (complete shutdown). | Yes Yes |
| 19 | Outdoor unit suction thermistor open-circuit error | Compressor stops if there is open circuit in outdoor unit suction thermistor (TH4). | At compressor start up | Operation OFF or ON | Only after outdoor unit restarts four times (complete shutdown). | Yes Yes |
| 20 | Outdoor unit 2-way valve thermistor open-circuit error | Compressor stops if there is open circuit in outdoor unit 2-way valve thermistor (TH5). | At compressor start up | Operation OFF or ON | Only after outdoor unit restarts four times (complete shutdown). | Yes Yes |
| 21 | Outdoor unit discharge thermistor open-circuit error | Compressor stops if there is open circuit in outdoor unit discharge thermistor (TH1). | At compressor start up | Operation OFF or ON | Only after outdoor unit restarts four times (complete shutdown). | Yes Yes |
| 22 | Serial signal error | Compressor stops if outdoor unit cannot receive serial signal from indoor unit for 30 seconds. | When in operation | Reset after reception of serial signal | None | None |
| 23 | Compressor start up error | Compressor stops if compressor fails to start up. | At compressor start up | Operation OFF or ON | Only after outdoor unit restarts eight times (complete shutdown). | Yes Yes |
| 24 | Outdoor unit DC fan error | Operation stops if there is no input of rotation pulse signal from outdoor unit fan motor for 30 seconds. | When outdoor unit fan is in operation | Operation OFF or ON | Only after outdoor unit restarts four times (complete shutdown). | Yes Yes |
| 25 | PAM over voltage error | Compressor stops if DC voltage is 400 V or higher. | When in operation | Operation OFF or ON | Only after outdoor unit restarts four times (complete shutdown). | Yes Yes |
| 26 | PAM clock error | When power source frequency cannot be determined (at start up), or when power source clock cannot be detected for 1 continuous second (at start up). | At compressor start up, when in operation | Operation OFF or ON | Only after outdoor unit restarts four times (complete shutdown). | Yes Yes |
| 27 | Outdoor unit thermal fuse blown in the Terminal board | Serial signal is lost. As a result, compressor stops if outdoor unit cannot receive serial signal from indoor unit for 30 seconds. | At compressor start up | Reset after reception of serial signal | None | None |