IVT Optima 1000 Assembly, Commissioning And Maintenance Manual page 34

What to do if a fault occurs
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 All menus for the temperature sensors.
Possible cause 1: Temporar y error.
Action: 1. Wait and see.
Possible cause 2: Defective sensor or incorrect connection.
Action: 1. Contact your dealer.
Motor circ. fan switch
Possible cause 1: The fan has jammed.
Action: 1. Check that nothing has become stuck in the fan.
Possible cause 2: Faulty fan motor.
Action: 1. Contact your dealer.
Possible cause 3: Temporar y error.
Action: 1. Contact your dealer should repeated faults occur.
Defrosting alarm
The defrosting alarm is caused by a too low water temperature in the heat
pump.
Possible cause 1: Air in the heating system.
Action: 1. Press the Ackn. button.
2. Check whether there is air in the radiators.
3. Fill the heating system and vent if necessary.
Possible cause 2: Particle fi lter in the heating transfer circuit is
clogged.
Action: 1. Press the Ackn. button.
2. Check the fi lter.
3. Clean the fi lter if necessary.
Possible cause 3: Faulty heat carrier pump.
Action: 1. Contact your dealer.
Possible cause 4: Not enough fl ow over the heat pump.
Action: 1. Check that the heat carrier pump has not jammed.
2. Check that all the valves are open.
Possible cause 5: Insuffi cient water level in the house's heating
system.
Action: 1. Contact your dealer.
34
The menu display shows:
ALARM (GT1)
Sensor return rad.
031020 16:08:15
Info Ackn.
The menu display shows:
ALARM (MB2)
Motor circ. fan sw.
031020 16:08:15
Info Ackn.
The menu display shows:
ALARM (GT10)
Defrosting alarm
031020 16:08:15
Info Ackn.