38
FOR THE USER
Heat transfer fl uid out max T8 (GT8)
There is a sensor T8 (GT8) in the heat pump, which for reasons of safety,
stops the compressor if the temperature of the water going out to the
radiators becomes too high.
Possible cause 1: 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. 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.
Possible cause 2: The particle fi lter on the hot side is clogged.
Action:
1. Clean the particle fi lter.
The heat pump starts automatically
when the alarm is reset and the water
temperature has dropped to its normal
value.
Note
High return to the heat pump T9 (GT9)
There is a sensor T9 (GT9) in the heat pump, which for reasons of safety,
stops the compressor if the temperature of the return water from the
radiators becomes too high. The limit lies at approximately 58ºC.
Possible cause 1: The heating setting is too high.
Action:
1. Lower the heating setting (
Temp. incr. / decr.
).
Possible cause 2: The valves on the radiators or fl oor heating
system are closed.
Action:
1. Open all valves.
2. Press the Ackn. button.
Possible cause 3: The hot water temperature is set too high.
Action:
1. An alarm is given in hot water mode.
Contact the installer to adjust the hot water
temperature.
Possible cause 4: The fl ow across the heat pump is greater than
the fl ow in the heating system.
(Only applies if a bypass is fi tted.)
Action:
1. Reduce the speed of the heat carrier pump or
increase the speed of the main pump in the
heating system.
2. Contact your dealer.
What to do if a fault occurs
The heat pump starts automatically
when the temperature drops.
Lower the speed of the heat carrier
pump:
Use a screwdriver or a coin to lower the
speed of the heat carrier pump. Turn
one step clockwise. The lowest speed
should be avoided.
Note
The menu display shows:
ALARM (GT9)
High return HP
040622 16:08:15
Info Ackn.
The menu display shows:
ALARM (GT8)
HTF out max
040622 16:08:15
Info Ackn.
