IVT Greenline HT Plus C Assembly, Commissioning And Maintenance Manual page 38

What to do is a fault occurs in the heatpump
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 sensor under the 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 below 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. Clear 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.
38
ALARM (GT1)
Sensor return rad.
080922 16:08:15
Info Ackn.
Note
ALARM (GT10)
HTF in under limit
080922 16:08:15
Info Ackn.
ALARM (GT11)
HTF out under limit
080922 16:08:15
Info Ackn.