Parameter 46 ERROR LIST for HP TYPE 1:
Checking all faults according to the fault list
Fault Cause Remedy
SOURCE MIN The defined minimum source tempera-
ture was not reached.
Check the minimum source temperature and change, if required. Check the source
volume flow. Check source design.
OTHER FAULT „Other fault“ for IWS was triggered. Check the source parameter
Check the volume flow parameter.
Check the volume flow parameter.
Check the source design
HP FAULT The high pressure limiter of the heat
pump has responded.
Check parameter 14 RTRN MAX (max. return temperature).
Check the volume flow and temperature on the heating side.
Check the connection of the flow and return sensors.
LP FAULT The low pressure limiter of the heat
pump has responded.
Check the volume flow and temperature on the source side.
Is the evaporator iced up?
⇒ Initiate a manual defrost
⇒ Check the defrosting function
Has refrigerant escaped?
⇒ Notify customer service
FROST PROTECT The frost protection sensor of the IWS is
faulty. Problems during defrosting.
Check the terminals of the frost protection sensor. Replace sensor.
Defrosting (parameter 39).
RELAY DRIVER The IWS fan monitor has a relay driver
fault.
You can reset the system via parameter 52 HP RESET.
Notify customer service if this fault occurs several times.
RELAY VOLTAGE The IWS fan monitor has a relay voltage
fault.
You can reset the system via parameter 52 HP RESET.
Notify customer service if this fault occurs several times.
ROTARY
SWITCH
The rotary switch of the IWS is faulty or
has been incorrectly adjusted.
You can reset the system via parameter 52 HP RESET.
Notify customer service if this fault occurs several times.
FAN SPEED The fan speed is insufficient for ventilating
the housing.
With externally installed air/water heat pumps, both DIP switches on the IWS
must be closed.
External influences, e.g. strong wind pressure on the ventilation aperture, can cause
the fan monitor to respond. Correct this through appropriate structural measures.
HARDWARE
FAULT
IWS hardware fault You can reset the system via parameter 52 HP RESET.
Notify customer service if this fault occurs several times.
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