Vaillant VWL 57/5 IS Operating, Installation And Maintenance Instructions

Also see for VWL 105/5 AS S2: Operating instructions Operating instructions Operating instructions

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Appendix0020257319_02 Hydraulic station Installation and maintenance instructions 51Statuscode MeaningS.240 Compr. oil temp. toolow, environment too coldThe compressor heating is switched on. The unit does not start up.S.252 Fan unit 1: Fan blocked If the fan speed is 0 rpm, the heat pump is switched off for 15 minutes and then restarted. If the fandoes not start up after four unsuccessful restarts, the heat pump is switched off and the fault mes-sage F.718 is displayed.S.255 Fan unit 1: Air inlettemp. too highThe compressor does not start because the outdoor temperature at the fan is above the operatinglimits. Heating mode: > 43 °C. Domestic hot water mode: > 43 °C. Cooling mode: > 46 °C.S.256 Fan unit 1: Air inlettemp. too lowThe compressor does not start because the outdoor temperature at the fan is below the operatinglimits. Heating mode: < -20 °C. Domestic hot water mode: < -20 °C. Cooling mode: < 15 °C.S.260 Fan unit 2: Fan blocked If the fan speed is 0 rpm, the heat pump is switched off for 15 minutes and then restarted. If the fandoes not start up after four unsuccessful restarts, the heat pump is switched off and the fault mes-sage F.785 is displayed.S.272 Building circuit: Re-maining feed head limit activeThe remaining feed head that is set under the configuration is reached.S.273 Building circuit: Flowtemperature too lowThe flow temperature that is measured in the building circuit is below the operating limits.S.275 Building circuit: Flowrate too lowBuilding circuit pump defective. All consumers in the heating system are closed. Flow rate is too lowfor recording with the volume flow sensor (< 120 l/h). The values fall below the specific minimumvolume flows. Check that the dirt filter is permeable. Check the stopcocks and thermostatic valves.Ensure that the flow rate is at least 35% of the nominal flow rate. Check that the building circuit pumpfunctions correctly.S.276 Building circuit: Lock-out contact S20 openContact S20 is open at the heat pump's main PCB. Incorrect limit thermostat setting. Flow temper-ature sensor (heat pump, gas-fired boiler, system sensor) measures values that deviate downwards.Adjust the maximum flow temperature for the direct heating circuit via the system control (observethe upper switch-off threshold for the boilers). Adjust the set value for the limit thermostat. Check thesensor valuesS.277 Building circuit: PumpfaultIf the building circuit pump is inactive, the heat pump is switched off for 10 minutes and is then restar-ted. If the building circuit pump does not start up after three unsuccessful restarts, the heat pump isswitched off and the fault message F.788 is displayed.S.280 Freq. converter fault:CompressorThe compressor motor or wiring is defective.S.281 Freq. converter fault:Mains voltageThere is overvoltage or undervoltage.S.282 Freq. converter fault:OverheatingIf the cooling of the frequency inverter is not sufficient, the heat pump is switched off for one hour andthen restarted again. If the cooling is not sufficient after three unsuccessful restarts, the heat pump isswitched off and the fault message F.819 is displayed.S.283 De-icing time too long If the de-icing takes longer than 15 minutes, the heat pump is restarted. If the time for the de-icing isstill not sufficient after three unsuccessful restarts, the heat pump is switched off and the fault mes-sage F.741 is displayed. ► Check whether sufficient thermal energy is available from the building cir-cuit.S.284 De-icing flow temperat-ure too lowIf the flow temperature is below 5 °C, the heat pump is restarted. If the flow temperature is still notsufficient after three unsuccessful restarts, the heat pump is switched off and the fault message F.741is displayed. ► Check whether sufficient thermal energy is available from the building circuit.S.285 Compressor outlet tem-perature too lowCompressor outlet temperature is too lowS.286 Hot gas temperatureswitch openIf the hot gas temperature is above 119 °C +5 K, the heat pump is switched off for one hour and thenrestarted again. If the hot gas temperature has not fallen after three unsuccessful restarts, the heatpump is switched off and the fault message F.823 is displayed.S.287 Fan 1: Wind Before starting, the fan rotates at a speed of 50 rpm or higher. This may be caused by a strong out-side wind.S.288 Fan 2: Wind Before starting, the fan rotates at a speed of 50 rpm or higher. This may be caused by a strong out-side wind.S.289 Current limit active The outdoor unit's power consumption is reduced, the compressor speed is reduced. The com-pressor's operating current exceeds the limit value that is set under the configuration. (for 3 kW,5 kW, 7 kW units: <16 A; for 10 kW, 12 kW units: <25 A)S.290 Switch-on delay active The compressor's switch-on delay is active.S.302 High-pressure switchopenIf the pressure in the refrigerant circuit exceeds the operating limit, the heat pump is switched off for15 minutes and is then restarted again. If the pressure remains too high after four unsuccessful re-starts, the fault message F.731 is displayed.S.303 Compressor outlet tem-perature too highThe operating characteristics have been exited. The heat pump is restarted.S.304 Evaporation temperat-ure too lowThe operating characteristics have been exited. The heat pump is restarted.