40
High pressure switch (HP)
Possible cause 1: Insuffi cient primar y fl ow over the heat pump.
Action:
1. Press the Ackn. button.
2. Check that the heating system pump has not
stopped.
3. Check that all the valves are open. Radiator ther-
mostat valves should be fully open and underfl oor
heating systems should have at least half of the
coils fully open.
4. Possibly increase the speed of the heating system
pump.
Possible cause 2: The fi lter on the primar y circuit is blocked.
Action:
1. Press the Ackn. button.
2. Check the fi lter.
3. Clean the fi lter if necessary.
Possible cause 3: Air in the primar y circuit.
Action:
1. Press the Ackn. button.
2. Check whether there is air in the radiators/under-
fl oor circuit.
3. Fill the heating system and vent if necessary.
Increase the speed of the heating
system pump:
Use a screwdriver or a coin to increase
the speed of the heating system pump.
Turn one step anti-clockwise.
Note
Electric heater (EK)
(Shown as
Electrical cassette
in the menu display)
Possible cause 1: The electric heater 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 the Technical Support Department if the
miniature circuit-breaker trips again.
Possible cause 2: The electric heater’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 heater’s
protective casing. The circuit-breaker is reset
when you hear a clicking sound.
3. Check that the fi lter on the primary circuit is clean.
The miniature circuit-breaker button
for the electric heater can be found
under the heading Fuses and reset
buttons on the heat pump.
The most frequent cause for the over-
heat protection tripping is a poor fl ow
through the primary circulating pump,
which can be due to air in the primary
pump or a blocked fi lter.
Note
ALARM (EK)
Electrical cassette
060822 16:08:15
Info Ackn.
ALARM (HP)
High press. switch
060822 16:08:15
Info Ackn.
What to do if a fault occurs
