Bosch Heat Pumps

The Heat Pump has detected a fault with the outdoor temperature sensor (TL1). This alarm indicates that the sensor or its signal cable has failed, is missing, or has short-circuited after multiple warnings.

The Heat Pump has detected a fault with the primary flow sensor (T0). This alarm indicates that the sensor or its signal cable has either failed or short-circuited after multiple warnings.

The Heat Pump has detected a fault with the heat transfer fluid outlet sensor (TC1) for zone 1. This alarm indicates the sensor or its signal cable has either failed or short-circuited after multiple warnings.

The Heat Pump has detected a fault with the heat transfer fluid outlet sensor (TC1) for zone 2. This alarm indicates the sensor or its signal cable has either failed or short-circuited after multiple warnings.

The Heat Pump has detected a fault with the heat transfer fluid inlet sensor (TC0) for zone 1. This alarm indicates the sensor or its signal cable has either failed or short-circuited after multiple warnings.

The Heat Pump has detected a fault with the heat transfer fluid inlet sensor (TC0) for zone 2. This alarm occurs after multiple short circuit or failure warnings for sensor TC0 over a short period.

The Heat Pump has detected a fault with the pool temperature sensor (TP1). This alarm indicates the sensor or its signal cable has either failed or short-circuited after multiple warnings.

The Heat Pump has detected a fault with the hot water sensor (TW1) for zone 1. This alarm indicates a failure or short circuit in the sensor or its signal cable after multiple warnings.

The electric cassette for zone 1 has triggered its overheat protection or the system pressure switch has indicated low pressure (below 0.5 bar) in the air module. This prevents damage to the unit.

The electric cassette for zone 2 has triggered its overheat protection or the system pressure switch has indicated low pressure (below 0.5 bar) in the air module. This prevents damage to the unit.

Your Heat Pump for zone 1 is reporting that it cannot operate at optimal efficiency because its heat curve or hot water temperature settings are too high, leading to increased energy consumption.

Your Heat Pump for zone 2 is reporting that it cannot operate at optimal efficiency because its heat curve or hot water temperature settings are too high, leading to increased energy consumption.

Your Heat Pump for zone 1 is operating with reduced performance due to insufficient heat transfer fluid flow. This can happen if the temperature difference (delta) is too high in heating or cooling mode.

The Heat Pump control board for zone 1 has lost communication with the indoor unit (tower). This alarm is triggered after multiple warnings or a prolonged communication failure via the CAN bus.

The pressure in Heat Pump Z1, monitored by sensor JR1, has registered as too high (above 67°C or 44 bar G) three times within two hours, leading to an alarm.

This alarm indicates that the compressor motor in Bosch Heat Pump zone 2 is not running synchronously. It triggers after 3 warnings within 3 hours, or if a warning is active for 30 minutes. The system may reset after 4 minutes if the cause is resolved.

This alarm signifies that the compressor in Bosch Heat Pump zone 1 is drawing too much current. It activates after 3 warnings in 3 hours, or if a warning is active for 30 minutes.

This alarm indicates that the compressor in Bosch Heat Pump zone 2 is drawing excessive current. It triggers after 3 warnings within 3 hours, or if a warning is active for 30 minutes.

This alarm indicates an overcurrent issue in the Power Factor Correction (PFC) part of the compressor driver in Bosch Heat Pump zone 2. It triggers after 3 warnings in 3 hours, or if a warning is active for 30 minutes.

This information message appears if the DC bus voltage in Bosch Heat Pump zone 1 exceeds 440 V for more than 30 seconds. The message typically resets after 4 minutes if the DC bus voltage drops below 380 V.

This alarm indicates that Bosch Heat Pump zone 1 is experiencing conditions of low overheating. It triggers after 3 warnings in 3 hours, or if a warning is active for 30 minutes.

This alarm indicates that Bosch Heat Pump zone 2 is experiencing conditions of low overheating. It triggers after 3 warnings in 3 hours, or if a warning is active for 30 minutes.

This alarm indicates that the condenser in Bosch Heat Pump zone 2 is at risk of freezing. It triggers if the temperature sensor TC3 is below 5°C. The alarm resets when TC3 and TC1 are both above 7°C. This alarm activates after 3 warnings in 3 hours, or if a warning is active for 30 minutes.

This warning indicates that Bosch Heat Pump zone 1 has failed its defrosting cycle. It triggers if the condenser temperature (TR24) is below 25°C or pressure sensor (PH1) is below 30°C after 800 seconds in defrosting. This warning activates after 3 occurrences in 3 hours, or if conditions are active for 30 minutes.

This warning indicates that Heat Pump Z2 has failed to complete its defrosting cycle. It occurs if specific temperature or pressure conditions are not met during defrosting, triggering after 3 failures in 3 hours, or if conditions are active for 30 minutes.

This alarm indicates that the compressor driver for Heat Pump Z1 is overheating. This happens if the internal temperature sensor in the inverter's PFC module exceeds 80°C for 10 seconds.

This alarm indicates that the compressor driver for Heat Pump Z2 is overheating. This happens if the internal temperature sensor in the inverter's PFC module exceeds 80°C for 10 seconds.

This alarm indicates an internal fault with the compressor driver in Heat Pump Z1. It triggers after 3 warnings within 3 hours, or if a warning remains active for 30 minutes.

This alarm indicates an internal fault with the compressor driver in Heat Pump Z2. It triggers after 3 warnings within 3 hours, or if a warning remains active for 30 minutes.

This alarm indicates a fault with the air intake temperature sensor TL2 in Heat Pump Z1, possibly due to a failure or short circuit. It triggers after 3 faults in 2 hours, or 15 minutes of continuous failure or short circuit.

This alarm indicates a fault with the air intake temperature sensor TL2 in Heat Pump Z1, possibly due to a failure or short circuit. It triggers after 3 faults in 2 hours, or 15 minutes of continuous failure or short circuit.

This alarm indicates a fault with the fluid line sensor TR3 for Heat Pump Z1 while in heating mode. This could be due to a sensor failure or a short circuit in the cable. It triggers after 3 faults in 2 hours, or 15 minutes of continuous failure or short circuit.

This alarm indicates a fault with the fluid line sensor TR3 for Heat Pump Z2 while in heating mode. This could be due to a sensor failure or a short circuit in the cable. It triggers after 3 faults in 2 hours, or 15 minutes of continuous failure or short circuit.

This alarm indicates a fault with the fluid line sensor TR4 for Heat Pump Z1 while in cooling mode. This could be due to a sensor failure or a short circuit in the cable. It triggers after 3 faults in 2 hours, or 15 minutes of continuous failure or short circuit.

This alarm indicates a fault with the fluid line sensor TR4 for Heat Pump Z2 while in cooling mode. This could be due to a sensor failure or a short circuit in the cable. It triggers after 3 faults in 2 hours, or 15 minutes of continuous failure or short circuit.

This alarm indicates a fault with the suction gas sensor TR5 for Heat Pump Z1. This could be due to a sensor failure or a short circuit in the cable. It triggers after 3 faults in 2 hours, or 15 minutes of continuous failure or short circuit.

This alarm indicates a fault with the suction gas sensor TR5 for Heat Pump Z2. This could be due to a sensor failure or a short circuit in the cable. It triggers after 3 faults in 2 hours, or 15 minutes of continuous failure or short circuit.

This alarm indicates a fault with the low-pressure sensor JR0 for Heat Pump Z1. This could be due to a wiring issue or a defective sensor. It triggers after 3 faults in 2 hours, or 15 minutes of constant failure.

This alarm indicates a fault with the low-pressure sensor JR0 for Heat Pump Z2. This could be due to a wiring issue or a defective sensor. It triggers after 3 faults in 2 hours, or 15 minutes of constant failure.

This alarm indicates a fault with the high-pressure sensor JR1 for Heat Pump Z1. This could be due to a wiring issue or a defective sensor. It triggers after 3 faults in 2 hours, or 15 minutes of constant failure.

This warning indicates that the condensing temperature in Bosch Heat Pump zone 1 is outside its highest permitted range. It triggers if the temperature on sensor PH1 is above the highest permitted actual envelope for longer than 30 seconds.

This alarm indicates that condensation levels in Bosch Heat Pump zone 1 are too high. It triggers after 3 warnings in 3 hours, or if a warning is active for 30 minutes.

This warning indicates low pressure (JR0) in Bosch Heat Pump zone 1. It triggers if sensor PL1 is below the lowest permitted actual envelope (-27°C) for longer than 30 seconds.

This alarm indicates low evaporation pressure (JR0) in Bosch Heat Pump zone 1. It activates after 3 warnings in 3 hours, or if a warning is active for 30 minutes.

This alarm indicates that condensation levels in Bosch Heat Pump zone 2 are too high. It triggers after 3 warnings in 3 hours, or if a warning is active for 30 minutes.

This warning indicates that the condensing temperature in Bosch Heat Pump zone 2 is outside its highest permitted range. It triggers if the temperature on sensor PH1 is above the highest permitted actual envelope for longer than 30 seconds.

This warning indicates low pressure (JR0) in Bosch Heat Pump zone 2. It triggers if sensor PL1 is below the lowest permitted actual envelope (-27°C) for longer than 30 seconds.

This alarm indicates low evaporation pressure (JR0) in Bosch Heat Pump zone 2. It activates after 3 warnings in 3 hours, or if a warning is active for 30 minutes.

This alarm indicates an overcurrent issue in the Power Factor Correction (PFC) part of the compressor driver in Bosch Heat Pump zone 1. It activates after 3 warnings in 3 hours, or if a warning is active for 30 minutes.

This alarm indicates that the defrosting cycle for Bosch Heat Pump zone 2 has exceeded its normal time or required too many attempts. It triggers if the timer for defrosting exceeds 800 seconds 3 times, or if 3 defrostings are needed in minimum time for heat production.

This alarm indicates that there is too much refrigerant in Bosch Heat Pump zone 1. It triggers if sensor PH1 is more than 5°C higher than TC3, and undercooling is greater than the set point, with both conditions met for longer than 5 minutes during hot water production.

This warning indicates a failure of compressor sensor TR1 in Bosch Heat Pump zone 2. It triggers after 3 faults (reading >364 kOhm) in 2 hours.

This warning indicates that compressor sensor TR1 in Bosch Heat Pump zone 2 has a short circuit. It triggers after 3 faults (reading >350 kOhm) in 2 hours.

This alarm indicates a fault, failure, or short circuit with compressor sensor TR1 in Bosch Heat Pump zone 2. It triggers after 3 faults in 3 hours, or 15 minutes of failure/short circuit on the sensor.

This warning indicates a failure of compressor sensor TR1 in Bosch Heat Pump zone 1. It triggers after 3 faults (reading >170 kOhm) in 2 hours.

This warning indicates that compressor sensor TR1 in Bosch Heat Pump zone 1 has a short circuit. It triggers after 3 faults (reading >350 kOhm) in 2 hours.

This alarm indicates a fault, failure, or short circuit with compressor sensor TR1 in Bosch Heat Pump zone 1. It triggers after 3 faults in 3 hours, or 15 minutes of failure/short circuit on the sensor.

Air trapped within the heat transfer or heating system can cause gurgling sounds, cold spots in radiators, and reduced heating efficiency.

The system filter or filter ball (SC1) is obstructed by dirt, which can significantly reduce the efficiency of your Heat Pump and heating system.

The flow of heat transfer fluid in your heating system is inadequate, leading to poor and uneven heating or cooling performance from the Heat Pump.