36
FOR THE USER
Pressure switch high (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. The thermo-
stat valves in heating systems should be fully
open and in fl oor heating systems at least half of
the coils should be fully open.
4. Possibly increase the speed of the heat carrier
pump.
Possible cause 3: The particle fi lter on the hot side is clogged.
Action:
1. Press the Ackn. button.
2. Check the fi lter.
3. Clean the fi lter if necessary.
Possible cause 4: The refrigerant circuit is overfi lled.
Action:
1. Contact your dealer.
Possible cause 5: The dr ying fi lter is clogged.
Action:
1. Contact your dealer.
HP in the menu display stands for
high pressure switch.
Note
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.
Note
Electric cassette (EK)
Possible cause 1: The electric cassette 's miniature circuit-breaker
has tripped.
Action:
1. Press the Ackn. button.
2. Reset the miniature circuit breaker button on the
heat pump (circuit breaker 3) by pushing up the
toggle switch.
3. Contact your dealer if the miniature circuit
breaker trips again.
Possible cause 2: The electric cassette’s overheat protection has
tripped.
Action:
1. Press the Ackn. button.
2. Reset the overheat protector (circuit breaker 4)
by pressing in the button on the electric cassette’s
protective casing. The circuit breaker is reset
when you hear a clicking sound.
3. Check that the particle fi lter on the hot side is
clean.
The miniature circuit-breaker button
for the electric cassette can be found
under the heading
Fuses and reset but-
tons on the heat pump
.
The most frequent cause for the over-
heat protection tripping is a poor fl ow
over the electric cassette, which can
be due to air in the heat pump or that
the particle fi lter is clogged.
Note
What to do if a fault occurs
The menu display shows:
ALARM (HP)
High press. switch
040622 16:08:15
Info Ackn.
The menu display shows:
ALARM (EK)
Electrical cassette
040622 16:08:15
Info Ackn.
