STIEBEL ELTRON WPM 3

46 | WPM 3 www.stiebel-eltron.com
INSTALLATION
Troubleshooting
13.2 Fault list
Fault list for HP TYPE 1 and 1*
Fault display Reason for fault code being triggered Possible cause of fault / remedy
LOW PRESSURE The low pressure sensor has responded; switching point 1.2 bar (abso-
lute) in heating mode within 60 seconds.
Refrigerant leak, expansion valve does not open.
ERR ND PRESSURE 5 faults in 2 hours of compressor runtime have occurred.
LP 2 Low pressure < 0.9 bar absolute within 5 seconds. Refrigerant leak, expansion valve does not open.
EXV LP 2 3 faults in 10 minutes of compressor runtime have occurred.
HIGH PRESSURE The high pressure limiter has responded; switching point 30bar ab-
solute.
Check the flow rate and sensor connection on the heating side.
ERR HD PRESSURE 5 faults in 2 hours of compressor runtime have occurred.
NO OUTPUT High pressure < low pressure + 2 bar within 30 seconds. Phase sequence incorrect or heat pump connection fuse has blown.
Remove the cause. Then carry out a WPM reset.
ERR K OUTPUT 5 faults in 2 hours of compressor runtime have occurred.
MIN SUPERHEAT-
ING
Superheating < superheating 50 % set within 5 minutes. Expansion valve not working correctly.
ERR M SUPER-
HEATING IWS
5 faults in 2 hours of compressor runtime have occurred.
REFRIGERANT LOW Superheating > superheating and expansion valve opening >limit. Refrigerant leak, incorrect expansion valve function.
ERR K LOW IWS 5 faults in 2 hours of compressor runtime have occurred.
DEFROST In defrost mode, flow, return or frost protection is < 10 °C; before de-
frosting, flow or return is < 18 °C within 30 seconds.
Water flow rate too low, water temperature too low.
ERR DEFROST 5 faults in 2 hours of compressor runtime have occurred.
HEXADECIMAL
SWITCH
Heat pump type DIP switch on the IWS incorrectly set for cascade
mode.
Isolate the heat pump from the power supply and set the DIP switch
correctly.
HD SENSOR MAX The high pressure sensor has responded; high pressure switching
point 1 bar; calibration 1 x every 24 hours.
Heating flow rate too low, selected room temperature / heating curve
too high.
MAX HOT GAS Hot gas temperature > 125 °C. Injection valve function incorrect, expansion valve function incorrect,
refrigerant leak.
MIN FLOW COOL Minimum flow temperature not reached; switching point 6.5 °C. Check heating flow rate, check flow sensor for cooling.
CONTACTOR STUCK Compressor or starting contactor stuck. Check contactors K1 and K2.
NO IWS PARAM Heat pump type was not transferred to the controller. Select the heat pump type via the HEAT PUMP TYPE parameter.
FLOW RATE Flow rate monitoring from heating output, flow temperature and re-
turn temperature.
Check flow rate.
ERR FLOW RATE 5 faults in 24 hours of compressor runtime have occurred.
ND COOLING The low pressure sensor has responded; switching point 4 bar (abso-
lute) in cooling mode within 5 seconds.
Non-return valve leaks.
Expansion valve not working correctly.
ERR ND COOLING 5 faults in 2 hours of compressor runtime have occurred.
ND DEFROST The low pressure sensor has responded; switching point 2 bar (abso-
lute) in defrost mode within 10 seconds.
Refrigerant escaped.
Expansion valve does not open.
ERR ND DEFROST 5 faults in 2 hours of compressor runtime have occurred.
ERR T COOL IWS Cooling/recuperator sensor Check sensor, leads and the relevant plug-in connectors, and replace
if faulty.
Fault list for HP TYPE 2 and 2*
Fault display Reason for fault code being triggered Possible cause of fault / remedy
LOW PRESSURE The low pressure sensor has responded Refrigerant leak, expansion valve does not open
ERR ND PRESSURE 5 faults in 2 hours of compressor runtime have occurred
FROST PROTECTION The frost protection pressure sensor has responded Refrigerant leak, expansion valve does not open.
Check source flow rate
HIGH PRESSURE The high pressure limiter has responded Check the flow rate and sensor connection on the heating side.
ERR HD PRESSURE 5 faults in 2 hours of compressor runtime have occurred
NO OUTPUT High pressure < low pressure + 3 bar within 30seconds Phase sequence incorrect or heat pump connection fuse has blown.
Remove the cause. Then carry out a WPM reset.
ERR K OUTPUT 5 faults in 2 hours of compressor runtime have occurred
DEFROST Frost protection temperature < 10 °C during defrosting Water flow rate too low, water temperature too low
ERR DEFROST 5 faults in 2 hours of compressor runtime have occurred
HEXADECIMAL
SWITCH
Heat pump type DIP switch on the IWS incorrectly set for cascade
mode.
Isolate the heat pump from the power supply and set the DIP switch
correctly.
HD SENSOR MAX The high pressure sensor has responded Heating flow rate too low; selected room temperature / heating curve
too high
MAX HOT GAS Hot gas temperature > 125 °C Injection valve function incorrect, expansion valve function incorrect,
refrigerant leak