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installation
troubleshooting
16.5 fault table
Fault display
Cause
remedy
SENSOR BREAK E 70
The mixer sensor is faulty.
Check the sensor terminal on the MFG or replace sensor.
SENSOR BREAK E 71
The source sensor is faulty.
Check the sensor terminal on the MFG or replace sensor.
SENSOR BREAK E 72
The flow sensor is faulty.
Check the sensor terminal on the MFG or replace sensor.
SENSOR BREAK E 73
The return sensor is faulty.
Check the sensor terminal on the MFG or replace sensor.
SENSOR BREAK E 75
The external sensor is faulty.
Check the sensor terminal on the MFG or replace sensor.
SENSOR BREAK E 76
The DHW sensor is faulty.
Check the sensor terminal on the MFG or replace sensor.
SENSOR BREAK E 80
The remote control is faulty.
Check the sensor terminal on the MFG or replace sensor.
SENSOR BREAK E 130
The HP sensor is faulty.
Check the sensor terminal on the MFG or replace sensor.
SENSOR BREAK E 128
The LP sensor is faulty.
Check the sensor terminal on the MFG or replace sensor.
ERR T FLO BH MFG
The flow sensor of the electric emergency/booster heater in the MFG is
faulty.
Check the sensor terminal in the MFG or replace sensor.
ERR T FLO HP MFG
The heat pump flow sensor on the MFG is faulty.
Check the sensor terminal on the MFG or replace sensor.
ERR T RTRN MFG
The return sensor on the MFG is faulty.
Check the sensor terminal on the MFG or replace sensor.
ERR T DHW MFG
The DHW sensor on the MFG is faulty.
Check the sensor terminal on the MFG or replace sensor.
HP SENSOR MAX
Fatal error in heating mode only; 5 faults within 5 minutes of compressor
runtime.
If the system has been shut down five times within the operating time (5
minutes), the fault will be added to the fault list and the system will be
permanently shut down. Generally, a shutdown via HP SENSOR MAX is a
controlled shutdown that is only displayed for information and for the du-
ration of the idle time, i.e. it is not entered into the fault list. Only frequent
shutdowns over a short period of time point towards a fault and are there-
fore entered into the fault list.
Only when a fault has been entered into the fault list: Monitor
the flow temperature and check the HP sensor. Check the flow
rate and the temperature on the heating side.
MAX HOT GAS T
The compressor will be stopped for the minimum idle time if a hot gas
temperature of 120 °C is exceeded. This is a normal controlled shutdown
that is not entered into the fault list. The reason for the shutdown is dis-
played for information during the idle time.
This requires no action, as it is a controlled shutdown.
HIGH PRESSURE
After the compressor has started and a delay of 15 seconds has elapsed,
the system checks whether relay K9 is open. If this is the case, a HP limit
switch has responded. The fault is added to the fault list and the system is
permanently shut down.
Monitor the flow temperature and check the HP sensor.
Check the flow rate and the temperature on the heating side.
LOW PRESSURE
The system will be permanently shut down after the fault has occurred
five times within the operating time (idle time x 50 plus 20 minutes). The
fault is added to the fault list after it has occurred for the first time.
Check the flow rate and the layout of the source side.
Check the refrigerant level.
MIN SRCE TEMP
Minimum source temperature
The defined minimum source temperature was not reached.
The fault is added to the fault list. The compressor starts again after the
selected idle time has expired.
Check the minimum source temperature and change it if re-
quired. Check the source flow rate: Check source design.
CONTACTOR STUCK
Each time the compressor is switched off, the system checks after 10
seconds whether the relay K9 is open. If this is the case, then a contactor
is stuck. The fault is added to the fault list and the system is permanently
shut down.
Check contactors K1 and K2 and replace if required.
NO OUTPUT
After the compressor has started, the pressure must have risen by 2 bar
within 10 seconds. If this is not the case, a fault has occurred. The fault is
added to the fault list if this is its first occurrence, and the system is per-
manently shut down.
Compressor is turning in the wrong rotational direction.
Change the rotational direction by interchanging two supply
cores.
TO T FLO BH MFG
The flow sensor of the electric emergency/booster heater in the MFG is
faulty.
Check the communication cable terminal or replace the com-
munication cable.
TO T FLO HP MFG
The heat pump flow sensor on the MFG is faulty.
Check the communication cable terminal or replace the com-
munication cable.
TO T RET MFG
The return sensor on the MFG is faulty.
Check the communication cable terminal or replace the com-
munication cable.
TO T DHW MFG
The DHW sensor on the MFG is faulty.
Check the communication cable terminal or replace the com-
munication cable.
TO FL RATE HC MFG
Faulty communication with the MFG.
Check the communication cable terminal or replace the com-
munication cable.
TO PRES HC MFG
Faulty communication with the MFG.
Check the communication cable terminal or replace the com-
munication cable.
TO P SOL MFG
Faulty communication with the MFG.
Check the communication cable terminal or replace the com-
munication cable.
TO PUMP HC MFG
Faulty communication between heating circuit pump and MFG.
Check the communication cable terminal or replace the com-
munication cable.
TO P BRINE MFG
Faulty communication between brine circuit pump and MFG.
Check the communication cable terminal or replace the com-
munication cable.
TO VALVE MFG
Faulty communication between 3-way diverter valve and MFG.
Check the communication cable terminal or replace the com-
munication cable.
TO BH MFG
Communication of the electric emergency/booster heater in the MFG is
incorrect.
Check the communication cable terminal or replace the com-
munication cable.
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