Error-code hub
Bosch Climate 5000 systems show an alphanumeric code on the indoor unit display. The 18 codes below cover the Gen 4 range plus the remaining legacy R-410A systems. Bosch's code set is smaller than most brands' here, which reflects a simpler product family rather than thinner documentation - Climate 5000 is essentially one line.
Unit applicability
This table is sourced for Climate 5000 A/B legacy R-410A. If your unit is a different generation or product line not named here, the same display code may vary by generation.
Common codes first
Ranking basis: we do not have failure-frequency telemetry. These are ordered by breadth of affected systems in the SplitAtlas catalog - the documented product line's published model count, whether the same code appears on more than one product line, and any manual applicability notes we hold. This is a breadth ranking, not a popularity claim.
E0 means indoor unit eeprom error. In plain English, a control board, EEPROM, or board sensing circuit is not reading internal data correctly.
E1 means communication error between indoor unit and outdoor units. In plain English, the indoor and outdoor controls are not exchanging the expected signal, so the system may stop because the two halves cannot coordinate safely.
E3 means indoor fan speed error. In plain English, a fan is not moving at the speed the control expects, so the system may stop to protect the coil, compressor, or inverter electronics.
E4 means indoor return air temperature sensor error. In plain English, the named temperature or air-quality sensor is not sending a believable reading, so the control cannot trust that part of the system.
E5 means indoor coil temperature sensor error. In plain English, the named temperature or air-quality sensor is not sending a believable reading, so the control cannot trust that part of the system.
EC means low refrigerant. In plain English, the unit is detecting abnormal refrigerant flow, low refrigerant, or a cooling-system condition.
Safe first checks
These codes have homeowner-safe steps such as filters, airflow, condensate/drain checks, remote/controller items, or a single safe power reset. If the code returns, stop at the boundary in the card.
Turn the system off with the remote, then power cycle once at the breaker or disconnect if you can do that safely. If the code returns, stop resetting and schedule service.
Read the full code guideTurn the system off. Clear only loose, obvious debris outside the cabinet or from the user-accessible intake area; do not remove panels. Reset once if safe.
Read the full code guideTurn the system off with the remote, then power cycle once at the breaker or disconnect if you can do that safely. Do not open covers, unplug sensors, or spray cleaner into the sensor area.
Read the full code guideTurn the system off with the remote, then power cycle once at the breaker or disconnect if you can do that safely. Do not open covers, unplug sensors, or spray cleaner into the sensor area.
Read the full code guideUse the Bosch catalog to connect these manual error codes to current model pages and replacement options.
Climate 5000 A/B legacy R-410A
Climate 5000 A/B legacy R-410A
Climate 5000 Gen 4
Climate 5000 Gen 4
Climate 5000 Gen 4
Climate 5000 Gen 4
E0 means indoor unit eeprom error. In plain English, a control board, EEPROM, or board sensing circuit is not reading internal data correctly.
E1 means communication error between indoor unit and outdoor units. In plain English, the indoor and outdoor controls are not exchanging the expected signal, so the system may stop because the two halves cannot coordinate safely.
E3 means indoor fan speed error. In plain English, a fan is not moving at the speed the control expects, so the system may stop to protect the coil, compressor, or inverter electronics.
E4 means indoor return air temperature sensor error. In plain English, the named temperature or air-quality sensor is not sending a believable reading, so the control cannot trust that part of the system.
E5 means indoor coil temperature sensor error. In plain English, the named temperature or air-quality sensor is not sending a believable reading, so the control cannot trust that part of the system.
EC means low refrigerant. In plain English, the unit is detecting abnormal refrigerant flow, low refrigerant, or a cooling-system condition.
F0 means outdoor current overload sensed. In plain English, the outdoor unit detected voltage or current outside the safe operating range.
F1 means outdoor ambient temperature sensor error. In plain English, the named temperature or air-quality sensor is not sending a believable reading, so the control cannot trust that part of the system.
F2 means outdoor coil temperature sensor error. In plain English, the named temperature or air-quality sensor is not sending a believable reading, so the control cannot trust that part of the system.
F3 means compressor discharge temperature sensor error. In plain English, the named temperature or air-quality sensor is not sending a believable reading, so the control cannot trust that part of the system.
F4 means outdoor unit eeprom error. In plain English, a control board, EEPROM, or board sensing circuit is not reading internal data correctly.
F5 means outdoor unit fan speed error. In plain English, a fan is not moving at the speed the control expects, so the system may stop to protect the coil, compressor, or inverter electronics.
F6 means indoor coil outlet temperature sensor error. In plain English, the named temperature or air-quality sensor is not sending a believable reading, so the control cannot trust that part of the system.
P0 means inverter module ipm error. In plain English, the outdoor inverter, IPM module, or compressor drive circuit is reporting abnormal load or protection.
P1 means high or low voltage protection. In plain English, the outdoor unit detected voltage or current outside the safe operating range.
P3 means outdoor unit low temperature lockout. In plain English, outdoor temperature is outside the range the unit allows, or the outdoor unit is reading it that way.
P4 means compressor drive error. In plain English, the compressor drive is reporting abnormal feedback or load.
P5 means mode conflict. In plain English, connected indoor units are asking for incompatible operation, such as heat from one room and cooling or dry mode from another.