Vaillant geoTHERM VWS Installation Instructions Manual

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Vaillant geoTHERM VWS Installation Instructions Manual Manual pdf 76 page image

Installation instructions geoTHERM VWS 0020046310_0176Faultcode Error text/description Emergencymode Possible cause Remedy91 Brine pressure too lowPressure <0.2 barHeat pump shuts down andgoes into operationautomatically when thepressure rises above 0.4 barpossible Pressure drop in the heat sourcesystem as a result of leakage or airlock.Check heat source system for leaks, topup brine, bleed.Brine pressure sensor defective. Check the plug contact on the PCB andthe cable harness, check pressuresensor for correct functioning, replacepressure sensor.L1 and N connections on the PCBinterchanged.Check L1 and N connections on the PCBand connect correctly if necessary.96 Error, coolant pressuresensorshort-circuit in the pressuresensorpossible A pressure sensor in the coolingcircuit is defective or not properlyplugged in.Check the plug contact on the PCB andthe cable harness, check pressuresensor for correct functioning, replacepressure sensor.97 no power for compressor possible Start-up current limiter defective orincorrectly connected.Check starting current limiter.Table 10.5 Fault-induced shutdown (cont.)10.6 Other errors/malfunctionsMalfunction sign Possible cause RemedyThe auxiliary heating does not function,even though it has been enabled by thecontroller (e.g. when the supply has beenblocked by the power supply company(Power company blockage)); the heating orthe domestic hot water cylinder do notreach the desired temperature.The auxiliary heating is tied to a low-ratetariff which has been blocked by the powercompany.Check whether the auxiliary heating is on alow-rate tariff and a power companyblockage is in effect.The safety thermostat (STB) on the auxiliaryheating has tripped.Release the STB by pushing the button.Possible causes if the thermostat trips again:Air in the heating system. Blocked dirt filtersin the heating system return line.Bleeding heating circuit. Clean the blockeddirt filters.The heating circulation pump has stopped oris running too slowly.check the heating circulation pump andreplace if necessary.Noise in the heating circuit. Air in the heating circuit. Bleeding heating circuit.Dirt in the heating circuit. Flush the heating circuit."Out T. aux htr on" incorrectly set. Change "Out T. aux htr on" (Menu A3).Faulty pump. Check functioning of the pump; replace ifnecessary.Traces of water beneath or next to theappliance.The condensate drain is blocked. Condensate in the interior of the unit iscollected in the condensate pan and, ifnecessary, fed away under the unit (not afault). Check the insulation on the pipes inthe interior of the unit and re-insulate, ifnecessary, to reduce the accumulation ofcondensate.Leaks from the heating circuit. Check the heating circuit components(pump, auxiliary heating, pipes) for leaks.If necessary, retighten the screw couplingsand replace the seals.Outside temperature indicates -60 ºC. Outside temperature sensor defective. Check outside temperature sensor.Temperatures in the heating circuit too coldor too warm.Room target temp. not optimally set Change room target temp. (Menu 1).Set-back temp. not optimally set Change set-back temp. (Menu 1).Heating curve not optimally set. Change heating curve (Menu C2).Table 10.6 Other errors/malfunctions10 Troubleshooting and diagnosis