Bosch Climate 8000i Service Manual

Function and Operation of Protective ProceduresClimate 8000i/8100i – 6721840685 (2021/05)163 Outdoor unit heatexchanger overheatshut downOperation frequency lowers if outdoorunit heat exchanger temperatureexceeds about 55 °C during coolingoperation.Compressor stops if outdoor unit heatexchanger temperature exceeds about55 °C for 120 seconds at minimumfrequency.When in cooling ordehumidifyingoperationAutomatic resetafter safety period(180 sec).None None Yes4 Compressordischarge overheatshut downOperating frequency lowers iftemperature of compressor dischargethermistor (TH1) falls below about110 °C.Compressor stops if temperature ofcompressor discharge thermistor (TH1)remains at about 110 °C (for120 seconds in cooling operation, or60 seconds in heating operation) atminimum frequency.When compressoris in operationAutomatic resetafter safety period(180 sec).None None Yes5 Dehumidifyingoperationtemporary stopCompressor stops if outside airtemperature thermistor is lower thanabout 16 °C during dehumidifyingoperation.When indehumidifyingoperationAutomatic resetwhen outside airtemperature risesabove 16 °C.None None Yes6 DC over currenterrorCompressor stops if DC current of about20 A or higher flows in IPM.When compressoris in operationOperation OFF or ON Only after outdoorunit restarts eighttimes (completeshutdown).Yes Yes7 AC over currenterrorOperating frequency lowers if outdoorAC current exceeds peak control currentvalue. Compressor stops if compressorAC current exceeds peak control currentvalue at minimum frequency.When compressoris in operationOperation OFF or ON Only after outdoorunit restarts fourtimes (completeshutdown).Yes Yes8 AC over currenterror in compressorOFF statusIndoor and outdoor units stop if outdoorAC current exceeds about 3 A whilecompressor is in non-operation status.When compressoris in non- operationReplacement ofdefective parts suchas IPMAfter a single errorjudgment(completeshutdown).Yes Yes9 AC maximumcurrent errorCompressor stops if outdoor AC currentexceeds 17 A.When compressoris in operationOperation OFF or ON After a single errorjudgment(completeshutdown).Yes Yes10 AC currentdeficiency errorCompressor stops if operatingfrequency is 50 Hz or higher andcompressor AC current is about 2.0 A orlower.When compressoris in operationOperation OFF or ON Only after outdoorunit restarts fourtimes (completeshutdown).Yes Yes11 Thermistorinstallation error or4-way valve errorCompressor stops if high and low valuesof temperatures detected by outdoorunit heat exchanger thermistor (TH2)and 2-way valve thermistor (TH5) do notmatch operating cycle.3 minutes aftercompressor startupOperation OFF or ON Only after outdoorunit restarts fourtimes (completeshutdown).Yes Yes12 Compressor hightemperature errorCompressor stops if compressordischarge thermistor (TH1) exceedsabout 114 °C, or if there is short-circuitin TH1.When in operation Operation OFF or ON Only after outdoorunit restarts fourtimes (completeshutdown).Yes Yes13 Outdoor unit heatexchangerthermistor short-circuit errorCompressor stops if there is shortcircuit in outdoor unit heat exchangerthermistor (TH2).At compressorstart upOperation OFF or ON Only after outdoorunit restarts fourtimes (completeshutdown).Yes YesOperation Self-diagnosisresult displayFunction Description Detection period Reset condition Indoor unit errordisplayIndoorunitOutdoorunit