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Parameter 46 ERROR LIST for HP TYPE 2 and 3:
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 source design.
Check contactors K1 and K2.
HP/LP FAULT The high or low pressure limiter of the
heat pump has responded.
High pressure limiter:
Check the RTRN MAX (max. return temperature) parameter.
Check the volume flow and temperature on the heating side.
Check the connection of the flow and return sensors.
Low pressure limiter (WPF-M):
Check the volume flow and temperature on the source side.
Check the refrigerant level (sight glass).
Low pressure limiter (WPL):
Is the evaporator iced up?
⇒ Initiate a manual defrost
⇒ Check the defrosting function
Has refrigerant escaped?
⇒ Check the level (sight glass).
⇒ 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 selector or sliding switch (HP
type) of the IWS is faulty or was incor-
rectly adjusted for cascade operation
You can reset the system via parameter 52 HP RESET.
Notify customer service if this fault occurs several times.
GRAVITY
SWITCH
The gravity switches of the IWS are not
closed.
Close the gravity switches.
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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