www.stiebel-eltron.com WPM 3| 51
INSTALLATION
Troubleshooting
Fault display Reason for fault code being triggered Possible cause of fault / remedy
ERR T VFL IWS Sensor value of the condenser outlet sensor outside the permissible range. Check sensor, leads and the relevant plug-in connec-
tors, and replace if faulty.
NO IWS PARAM Heat pump type was not transferred to the controller. Select the heat pump type via the HEAT PUMP TYPE
parameter.
ERR T AUS IWS Sensor value of the outside temperature sensor outside the permissible range. Check sensor, leads and the relevant plug-in connec-
tors, and replace if faulty.
ERR T EXHA IWS Sensor value of the exhaust air sensor outside the permissible range. Check sensor, leads and the relevant plug-in connec-
tors, and replace if faulty.
ERR T SUCT VHD Sensor value of the suction gas temperature sensor for high pressure compressor
outside the permissible range.
Check sensor, leads and the relevant plug-in connec-
tors, and replace if faulty.
ERR T SUCT VND Sensor value of the suction gas temperature sensor for low pressure compressor
outside the permissible range.
Check sensor, leads and the relevant plug-in connec-
tors, and replace if faulty.
ERR T VER IWS Sensor value of the evaporator temperature sensor outside the permissible range Check sensor, leads and the relevant plug-in connec-
tors, and replace if faulty.
ERR T HTG IWS Sensor value of the hot gas temperature sensor outside the permissible range. Check sensor, leads and the relevant plug-in connec-
tors, and replace if faulty.
ERR T OILS IWS Sensor value of the oil sump temperature sensor outside the permissible range. Check sensor, leads and the relevant plug-in connec-
tors, and replace if faulty.
ERR ND SENSOR Sensor value of the low pressure sensor outside the permissible range. Check sensor, leads and the relevant plug-in connec-
tors, and replace if faulty.
ERR MD SENSOR Sensor value of the mean pressure sensor outside the permissible range. Check sensor, leads and the relevant plug-in connec-
tors, and replace if faulty.
ERR HD SENSOR Sensor value of the high pressure sensor outside the permissible range. Check sensor, leads and the relevant plug-in connec-
tors, and replace if faulty.
ERR EV DIFF PR Sensor value of the differential pressure sensor outside the permissible range. Check sensor, leads and the relevant plug-in connec-
tors, and replace if faulty.
ERR CURRENT Value of the current sensor outside the permissible range. Check leads and the relevant plug-in connectors, and
replace if faulty.
ERR OIL COMPENSA-
TION
Oil compensation valve does not open/close. Check leads and the relevant plug-in connectors, and
replace if faulty.
COMM U IWS CSW Limiter communication interruption IWS / CWS. Check leads and the relevant plug-in connectors, and
replace if faulty.
Fault list for HP type 5 and 5*
Fault display Reason for fault code being triggered Possible cause of fault / remedy
LOW PRESSURE The low pressure sensor has responded; switching point 2.0 bar
(absolute) in heating mode within 60 seconds
Refrigerant leak, expansion valve does not open
HIGH PRESSURE The high pressure switch has responded; switching point 42bar
(absolute)
Check the flow rate and sensor connection on the heating side
ERR T FROS IWS B9 - Sensor value of the frost protection sensor outside the permis-
sible range
Check sensor, leads and the relevant plug-in connectors, and replace
if faulty
DIP WP TYPE The heat pump type DIP switch of the IWS is set incorrectly. Isolate the heat pump from the power supply and set the DIP switch
correctly.
ERR T SUCT V ND TR5 - Sensor value of the compressor's suction gas temperature
sensor outside the permissible range
Check sensor, leads and the relevant plug-in connectors, and replace
if faulty
DEFROST In defrost mode, flow, return or frost protection is < 10 °C; before
defrosting, flow or return is < 18 °C within 30 seconds
Water flow rate too low, water temperature too low
ERR T HTG IWS TR6 - Sensor value of the hot gas temperature sensor outside the
permissible range
Check sensor, leads and the relevant plug-in connectors, and replace
if faulty
ERR T VER IWS TR4 - Sensor value of the evaporator temperature sensor outside
the permissible range
Check sensor, leads and the relevant plug-in connectors, and replace
if faulty
ERR T AUS IWS TL2 - Sensor value of the outside temperature sensor outside the
permissible range
Check sensor, leads and the relevant plug-in connectors, and replace
if faulty
ERR ND PRESSURE 5 LOW PRESSURE faults occurred in 2 hours of compressor runtime Remove the cause. Then carry out a WPM reset.
ERR HD PRESSURE Five HIGH PRESSURE faults occurred in 2 hours of compressor
runtime
Remove the cause. Then carry out a WPM reset.
MAX HOT GAS Hot gas temperature > 130 °C Incorrect injection valve function; incorrect expansion valve function;
refrigerant leak
ERR HD SENSOR JR1 - Sensor value of the high pressure sensor outside the permis-
sible range
Check sensor, leads and the relevant plug-in connectors, and replace
if faulty
ERR ND SENSOR JR0 - Sensor value of the low pressure sensor outside the permis-
sible range
Check sensor, leads and the relevant plug-in connectors, and replace
if faulty
NO OUTPUT High pressure < low pressure + 3 bar within 30 seconds after com-
pressor start
Check all MCB/fuses.
ERR M SUPERHEATING
IWS
Five MIN SUPERHTG faults occurred in 2 hours of compressor runt-
ime
Remove the cause. Then carry out a WPM reset.
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