IVT Optima 1000 Assembly, Commissioning And Maintenance Manual page 33

Low pressure switch (LP)
Possible cause 1: The evaporator is clogged.
Action: 1. Clean the evaporator. See Maintenance.
2. Press the Ackn. button.
3. Wait for the heat pump to start.
4. If the fault returns, contact your dealer.
Possible cause 2: Lack of refrigerant in the heat transfer circuit.
Action: 1. Press the Ackn. button.
2. Wait for the heat pump to start.
3. If the fault returns, contact your dealer.
Possible cause 3: Fault in the automatic defrosting system or fan
motor.
Action: 1. Press the Ackn. button.
2. Wait for the heat pump to start.
3. If the fault returns, contact your dealer.
Possible cause 4: Faulty expansion valve (the alarm appears in
time periods of 3-4 weeks).
Action: 1. Press the Ackn. button.
2. Wait for the heat pump to start.
3. If the fault returns, contact your dealer.
High pressure switch (HP)
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: Not enough fl ow over the heat pump.
Action: 1. Press the Ackn. button.
2. Check that the heat carrier pump has not stopped.
3. Check that all the valves are open.
4. Possibly increase the pump speed.
Possible cause 3: Particle fi lter is clogged.
Action: 1. Press the Ackn. button.
2. Check the fi lter.
3. Clean the fi lter if necessary, see Maintenance.
Possible cause 4: The refrigerant circuit is overfi lled.
Action: 11. Press the Ackn. button.
2. Wait for the heat pump to start.
3. If the fault returns, contact your dealer.
Possible cause 5: The dr ying fi lter is clogged.
Action: 1. Press the Ackn. button.
2. Wait for the heat pump to start.
3. If the fault returns, contact your dealer.
LP in the menu display stands for
low pressure switch.
Increase the speed of the heat car-
rier pump:
Use a screwdriver or a coin to increase
the speed of the heat carrier pump. Turn
one step anti-clockwise.
33
What to do if a fault occurs
The menu display shows:
ALARM (LP)
Low pressure switch
031020 16:08:15
Info Ackn.
Note
The menu display shows:
ALARM (HP)
High pressure switch
031020 16:08:15
Info Ackn.
Note