Bosch EHP 6-11 LW User And Installation Manual page 37

Sensor fault
All sensors connected to the heat pump can give an alarm when defective. In the
example to the right it is sensor T1 (GT1), Return radiator, which has given an
alarm. All sensors give alarms in the same way. Read more about the sensors
under heading Read the temperatures on the heat pump.
Possible cause 1: Temporar y error.
Action: 1. Wait and see.
Possible cause 2: Short circuit or broken sensor cable.
Action: 1. If you have an ohmmeter you can disconnect the
sensor and check the cable's resistance. Compare with
the sensor table in the section Technical information.
Otherwise contact your dealer.
Possible cause 3: Defective sensor or incorrect connection.
Action: 1. Contact your dealer.
HTF in under limit T10 (GT10) and HTF out under
limit T11 (GT11)
Possible cause 1: Temporar y low heat transfer fl uid temperature.
Action: 1. Wait and see.
2. If the alarm returns, contact your dealer.
Possible cause 2: Too low fl ow on the cold side.
Action: 1. Check the particle fi lter.
2. Clean the fi lter if it is clogged.
Possible cause 3: The minimum heat transfer fl uid temperature has
been set too low.
Action: 1. Wait and see.
2. If the alarm returns, contact your dealer.
In a groundwater system the cause may also be:
Possible cause 4: Clogged fi lter in the groundwater circuit.
Action: 1. Clean the fi lter.
Possible cause 5: The motor cut-out or a fuse on the pump in the
groundwater system has tripped.
Action: 1. Reset the motor cut-out or fuse.
Possible cause 6: Faulty pump in the groundwater circuit.
Action: 1. Contact your dealer.
Switch off the power before checking
the resistance of the cable.
The factory settings are 0°C and -2°C
respectively. If anti-freeze liquid is
used these values need to be changed.
Contact your installer
37
What to do if a fault occurs
Alarm (GT1)
Sensor return rad.
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Info Ackn.
Note
Note
Alarm (GT10)
Pump inlet too cold
040622 16:08:15
Info Ackn.
Alarm (GT11)
Pump outlet too cold
040622 16:08:15
Info Ackn.