Bosch Compress 7000 Heat Pumps

The room sensor displays an error code (A21, A22, A23, or A24) because the EMS bus signal has gone absent from the parent controller (display HMC300/HPC400) after successful installation.

The local device has not received its EMS token from the EMS bus master for a certain amount of time. This indicates a break, disruption, or interference on the EMS bus connection.

This alarm is triggered if the installer has selected an external room temperature sensor module to control heating circuit 1, but this module has not been developed or is not physically connected.

This alarm is triggered if the installer has selected an external room temperature sensor module to control heating circuit 2, but this module has not been developed or is not physically connected.

This warning indicates that the heat carrier outlet temperature sensor TC1 has an open circuit. This means the sensor is not properly connected, its cable is broken, or the sensor itself is faulty.

This warning indicates that the heat carrier outlet temperature sensor TC1 has a short circuit. This typically means there's an electrical short within the sensor or its connecting cable.

This alarm indicates a persistent failure of the heat carrier outlet sensor TC1. It is triggered after repeated errors or continuous open/short circuit conditions for 15 minutes, combining conditions for warnings 5207 and 5208.

This warning indicates that the heat carrier return sensor TC0 has an open circuit. This means the sensor is not properly connected, its cable is broken, or the sensor itself is faulty.

This warning indicates that the heat carrier return sensor TC0 has a short circuit. This typically means there's an electrical short within the sensor or its connecting cable.

This alarm indicates a persistent failure of the heat carrier return sensor TC0. It is triggered after repeated warnings or continuous open/short circuit conditions for 15 minutes, combining conditions for warnings 5213 and 5214.

This alarm indicates that either the electrical heater's overheating protector has triggered, or the heating system's pressure guard (MC1) has activated due to low system pressure (below 0.5 bar).

This warning appears when the heat carrier temperature difference (delta) exceeds 13K in heating mode or 7K in cooling mode. This suggests restricted flow or poor circulation within the heating system.

This alarm indicates a problem with the external additional heater or its overheating protector, specifically if 230 V is detected on terminal 64 on the installer module.

This alarm indicates that a phase is missing from the power supply. For 3-phase models, the Heat Pump shuts down if L3 is missing, and the indoor unit shuts down if L1 is missing.

This alarm indicates a fault with the electric anode. This is shown by a red LED on the electrical anode board, or if voltage greater than 1 V DC is detected on terminals 45, 46 on the installer module for over 6 hours.

This alarm triggers if the circuit for the pressure guard (external input I1-I2-I3-I4) is broken, indicating that the pressure in the cold carrier (brine) circuit has fallen below its chosen limit.

This alarm indicates that communication with the compressor control system is missing, or more than 30% of data sent to the inverter returns with errors. This can be caused by power issues, incorrect settings, or cable interference.

This warning indicates that the incoming AC voltage to the inverter has dropped below 165 V for 10 seconds, or below 180 V for 0.5 seconds. The warning resets automatically after 2 minutes if voltage returns above 190 V.

The compressor motor failed to synchronize after five start attempts. This could be due to cabling issues, oil or liquid in the compressor, a bad sensor reading, or incorrect rotary encoder settings.

This alarm triggers if three warnings (code 5350) are registered within three hours, or if the warning is active for 30 minutes. It indicates a persistent problem with the compressor motor failing to start or synchronize.

The inverter has detected an overcurrent condition (greater than 42 A DC for more than 20 microseconds) to the compressor. The warning automatically resets after 4 minutes if the condition is no longer present.

This alarm triggers if three warnings (code 5354) are registered within three hours, or if the warning is active for 30 minutes. It indicates a persistent overcurrent condition to the compressor.

This information message indicates that the supply voltage to the Heat Pump has exceeded 400 V for more than 30 seconds. It automatically resets after 4 minutes if the voltage drops below 380 V.

This warning indicates that the suction gas superheat is below 2 degrees Celsius and the discharge gas superheat is below 20 degrees Celsius. This can point to issues with the electronic expansion valve or its motor.

This alarm triggers if three warnings (code 5366) are registered within three hours, or if the warning is active for 30 minutes. It indicates a persistent issue with the refrigerant's superheat being too low.

This warning appears if the condenser temperature drops below 5°C, indicating a risk of frost damage. It resets automatically if the temperature rises above 7°C.

This alarm is triggered if the 'Risk of frost in condenser' warning (code 5374) occurs repeatedly (3 times within 3 hours) or remains active for 30 minutes, indicating a critical and persistent risk of frost damage.

This alarm indicates that the internal temperature sensor in the inverter's PFC module has exceeded 80°C, signifying that the compressor driver is overheating.

This warning indicates that the inverter has detected an over-current (> 42 A DC) to the compressor. This can be caused by issues in the cabling between the inverter and the compressor.

This alarm indicates a persistent issue with the compressor's internal driver, triggered if three warnings (code 5394) are registered within three hours, or if the warning is continuously active for 30 minutes.

This warning indicates that the circuit for sensor TR3 is broken, meaning its resistance is greater than 179 kOhm. This usually points to a loose connection, a broken sensor, or a defective I/O module.

This alarm triggers if warning codes 5414 or 5415 occur three times within two hours, or if sensor TR3 is continuously broken or shorted for 15 minutes. It indicates a persistent issue with the condensate sensor in heating mode.

This warning indicates that the circuit for sensor TR4 is broken, with a resistance reading greater than 170 kOhm. This could be due to a loose connection, a broken sensor, or a faulty I/O module.

This warning indicates that the voltage on terminal 17 on the I/O module is below 0.5 V DC. This typically suggests a poor connection, a defective pressure sensor JR0, or a faulty I/O module.

This alarm triggers if warning 5432 is registered three times within 15 minutes, or if the circuit is continuously broken for 15 minutes. It signifies a persistent issue with the low pressure sensor JR0.

This warning indicates that the voltage on terminal 16 on the I/O module is below 0.5 V DC. This typically suggests a poor connection, a defective pressure sensor JR1, or a faulty I/O module.

This alarm triggers if warning 5438 is registered three times within two hours, or if the circuit for pressure sensor JR1 is continuously broken for 15 minutes. It signifies a persistent issue with the high pressure sensor JR1.

This alarm indicates that the hoses for flow and return between the Heat Pump and the indoor unit have been incorrectly connected, causing abnormal temperature and pressure readings.

This alarm indicates that the Heat Pump may have too little refrigerant. This can happen if the electronic expansion valve has opened more than expected, suggesting a potential leak.

This warning indicates an internal fault within the Heat Pump's inverter, which controls the compressor. This could be a temporary issue or a sign of a defective component.

This warning occurs if the incoming AC voltage to the outdoor unit's inverter drops below 165 V for 10 seconds. It will automatically reset after 2 minutes if the voltage returns above 190 V.

This alarm indicates that the Heat Pump's defrost function is failing. This can be caused by excessive ice on the evaporator, issues with the heating system's temperature, or a clogged filter.

This warning means that the protective thermostat for your underfloor heating system has activated, likely due to exceeding a set temperature limit. This is a safety feature to prevent overheating.

This warning indicates that communication between the Heat Pump's installer module and the power guard system has been lost for 30 seconds. This suggests a wiring or cable issue.

This alarm is triggered if the 'Connection problem with the power guard' warning (code 5503) is registered multiple times within 3 hours, or remains active for 30 minutes, indicating a persistent and critical communication failure.

This alarm indicates that the Heat Pump's compressor did not start within 2 minutes after receiving a signal to do so. This could be due to a temporary malfunction or an internal inverter issue.

The circuit for the high pressure guard MR1 is broken for more than 3 seconds. This causes the compressor to stop, indicating a potential issue with the pressure guard or its connections.

This alarm is triggered if the high pressure warning code 5507 occurs two times within three hours. It indicates a recurring or persistent issue with the high pressure guard MR1 circuit.

The temperature of sensor JR1 is outside the currently allowed operating range for more than 30 seconds. This suggests the condensation temperature is too high relative to the evaporating temperature.

This alarm triggers if three warnings (code 5512) are registered within three hours, or if the warning is active for 30 minutes. It indicates a persistent issue with the condensation temperature being too high.

This warning indicates that the temperature reading from sensor JR0 is below -27°C for more than 30 seconds. This suggests issues with air flow, the fan, expansion valves, or the I/O module.

This alarm triggers if three warnings (code 5514) are registered within three hours, or if the warning is continuously active for 30 minutes. It indicates a persistent problem with the evaporation pressure being too low.

This alarm indicates that the rotary encoder setting on the installer board does not match the specific indoor and outdoor Heat Pump units installed. This often happens after replacing a component if the new part isn't configured correctly.

This warning indicates that the incoming AC current to the compressor driver has exceeded 31 A multiple times. It may signify a temporary malfunction within the inverter.

This alarm is triggered if the 'Internal compressor driver warning 3' (code 5523) occurs repeatedly or for an extended period, indicating a persistent internal error in the Heat Pump's inverter.

This alarm indicates that the Heat Pump has been overfilled with refrigerant. This condition is detected during hot water production when specific temperature and subcooling parameters are met for more than 5 minutes.

This warning indicates that the circuit for the compressor temperature sensor TR1 is open. This means the sensor connection is loose, the sensor itself is broken, or its signal cable is damaged.

This warning indicates that the circuit for the compressor temperature sensor TR1 has a short circuit. This typically means there's an electrical short within the sensor or its connecting cable.

This alarm indicates a persistent failure of the compressor temperature sensor TR1. It is triggered if warnings 5531 (open circuit) or 5532 (short circuit) occur repeatedly or are continuously active for 15 minutes.

This alarm indicates that the low pressure sensor has detected persistent problems in the brine circuit, triggered after repeated warnings. This alarm is only active when the Heat Pump is operating in cooling mode.