Vaillant ecoTEC pro 24 Installation And Maintenance Instructions Manual

Also see for ecoTEC pro 24: Instructions for use Instructions for installation and servicing Instructions for installation and servicing Instructions for installation and servicing

Appendix38 Installation and maintenance instructions ecoTEC pro 0020244995_02Message Possible cause MeasureF.77 Fault: Flue non-ret.valve/condens. pumpNo flue non-return flap feed-back; condensate pump over-flow▶ Check: Cable to VR40 accessory, flue non-return flap (wiring,feedback switch), condensate pump, bridge from the surface-mounted thermostat, 2 in 7 multi-functional module (bridge).F.78 Interrupt.: DHW outletsensor on ext. contr.UK link box is connectedwithout the domestic hot watertemperature sensor beingbridged1. Check: Accessory (configuration/electrical connection).2. The unit displays a fault, but the unit has not malfunctioned.F.83 Fault: NTC temp. gradi-entTemperature differencebetween flow and returntemperature sensor is too small▶ Check: Flow/return temperature sensor (function, correctthermal connection), sufficient water volume.F.84 Fault: NTC temp. diff.implausibleTemperature difference is im-plausible▶ Check: Flow/return temperature sensor (correct thermal con-nection, sensors are inverted).F.85 Fault: NTCs fitted incor-rectlyFlow/return temperat-ure sensors returningincorrect/implausible values▶ Check: Flow/return temperature sensor (correct thermal con-nection).Communication fault Communication fault betweenthe display and the PCB in theelectronics box▶ Check: Cable/plug between the display and the PCB.D Check programmes – OverviewPrüfprogramme MeaningP.00 Purging The internal pump is cyclically actuated. The heating circuit and the domestic hot water circuit are ad-aptively purged by automatically switching the circuits using the automatic air vent (the automatic airvent's flap must be loose). The active circuit is shown in the display. Press once to start purgingthe heating circuit. Press once to end the purge programme. Note: The purge programme runs for7.5 min per circuit and then terminates. Purging the heating circuit: Prioritising diverter valve in heat-ing position, actuation of internal pump for 9 cycles: 30 seconds on, 20 seconds off. Display: Activeheating circuit. Purging the domestic hot water circuit: After the above-mentioned cycles have run orthe right-hand selection button has been pressed again: Prioritising diverter valve in the domestic hotwater position, actuation of the internal pump as above. Display: Active hot water circuit.P.01 Maximum load After successful ignition, the product is operated at maximum heat input.P.02 Minimum load After successful ignition, the product is operated at minimum heat input.P.06 Filling mode The prioritising diverter valve is moved to the mid-position. The burner and pump are switched off (tofill or drain the product).