STIEBEL ELTRON WPM 3

52 | WPM 3 www.stiebel-eltron.com
INSTALLATION
Troubleshooting
Fault display Reason for fault code being triggered Possible cause of fault / remedy
MIN SUPERHEATING Superheating is < minimum value for superheating within 20 min-
utes, applies to both superheating of the refrigerant at the evapo-
rator output and superheating of the refrigerant at the suction gas
connection of the high pressure compressor
Expansion valve not working correctly
ERR DEFROST Five DEFROST faults occurred in 2 hours of compressor runtime Remove the cause. Then carry out a WPM reset.
MIN FLOW COOL Minimum flow temperature not reached; switching point 6.5 °C. Check heating flow rate, check flow sensor for cooling.
ERR T VFL IWS TR3 - Sensor value of the condenser outlet sensor outside the per-
missible range
Check sensor, leads and the relevant plug-in connectors, and replace
if faulty
INV H INV EXCESS
CURRENT
INV major fault inverter excess current Inverter fault
INV H PFC EXCESS
CURRENT
INV major fault PFC excess current Inverter fault
INV H AC EXCESS
VOLTAGE
INV major fault AC excess voltage Inverter fault
INV H AC UNDERVOLT-
AGE
INV major fault AC undervoltage Inverter fault
INV H AC VOLTAGE
BALANCE
INV major fault AC voltage balance Inverter fault
INV H INV EXCESS
TEMP
INV major fault inverter excess temperature Inverter fault
INV H PFC EXCESS
TEMP
INV major fault PFC excess temperature Inverter fault
INV H ROTOR VECTOR INV major fault rotor vector Inverter fault
COMMUNICATION IWS
INV N
Limiter low priority communication interruption IWS/INV Inverter fault. Check wiring and associated plug-in connectors; replace
if faulty. Check inverter power supply.
COMMUNICATION IWS
INV H
Limiter high priority communication interruption IWS/INV Inverter fault. Check wiring and associated plug-in connectors; replace
if faulty. Check inverter power supply.
ERR T OIL S IWS Sensor value of the oil sump temperature sensor outside the per-
missible range
Check sensor, leads and the relevant plug-in connectors, and replace
if faulty
SOA HD EXCEEDED High pressure above SOA HP limit for impermissible length of time Refrigerant circuit cannot adjust operating conditions to SOA range for
compressor
8167 The heat pump type set with the rotary selector does not match the
installed electronic assembly
Set the rotary selector to the correct position or replace the electronic
assembly
8168 4-way diverter valve does not switch to cooling Valve jammed or faulty
8169 4-way diverter valve does not switch to heating Valve jammed or faulty
8170 “Internal inverter errors
-IPM current sampling error
-DC bus live
-AC input overcurrent
-AC input voltage sampling error
-DSP and PFC communication error
-Heat sink sensor fault
-DSP and MCU communication error”
Check inverter wiring/electr. connection; if necessary, replace inverter
8176 Flow and return connections have been interchanged Check hydraulic connections
8177 Evaporator cannot dissipate enough heat in cooling mode Cleaning the evaporator
8181 Multiple occurrence of fault "ERR HD SENSOR" See fault "ERR HD SENSOR"
8182 Multiple occurrence of fault "ERR ND SENSOR" See fault "ERR ND SENSOR"
8183 Multiple occurrence of fault "SOA HD EXCEEDED" Check DHW set temperature/DHW output and reduce if necessary
8184 Multiple occurrence of fault "MAX HOT GAS" Check output setting and reduce if necessary
8185 Multiple occurrence of fault "DEFROST" or "MIN FLOW COOL" Check system temperatures/flow rate
8186 Multiple occurrence of fault "INV H INV EXCESS CURRENT" See fault "INV H INV EXCESS CURRENT"
8188 Multiple occurrence of fault "8168" See fault "8168"
8189 Multiple occurrence of fault "8169" See fault "8169"
8191 Multiple response of inverter overcurrent relay Inverter fault
8192 Multiple occurrence of fault "INV H PFC EXCESS CURRENT" See fault "INV H PFC EXCESS CURRENT"
8193 Multiple occurrence of fault "INV H INV EXCESS TEMP" See fault "INV H INV EXCESS TEMP"
8208 Multiple response of high pressure switch at inverter See fault "HIGH PRESSURE"