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FOR THE USER
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. The thermostat
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.
HP in the menu display stands for
high pressure switch.
Note
Increase the speed of the heat
carrier 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
buttons on the heat pump for the heat
pump.
The most frequent cause for the
overheat protection tripping is a poor
fl ow over the heat pump, 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
ALARM (HP)
High pressure switch
040622 16.08.15
Info Ackn.
ALARM (EK)
Electric cassette
040622 16.08.15
Info Ackn.
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