Vaillant ecoTEC plus SERIES Installation And Maintenance Instructions Manual

Also see for ecoTEC plus 612: Instructions for use Instructions for installation and servicing Instructions for use Installation and maintenance manual Instructions for installation and servicing

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Vaillant ecoTEC plus SERIES Installation And Maintenance Instructions Manual Manual pdf 69 page image

TroubleshootingInstallation and maintenance instructions ecoTEC plus 0020116700_01 691313.2.8 Overview of fault codesCode Meaning CauseF.00 Flow temperature sensor interruption NTC plug not plugged in or has come loose, multiple plug on the PCBnot plugged in correctly, interruption in cable harness, NTC defectiveF.01 Return temperature sensor interruption NTC plug not plugged in or has come loose, multiple plug on the PCBnot plugged in correctly, interruption in cable harness, NTC defectiveF.02 Interruption cylinder charging sensor actoSTOR(NTC) only in combination with F.91NTC defective, NTC cable defective, defective plug connection on NTC,defective plug connection on actoSTOR electronicsF.03 Interruption cylinder sensor actoSTOR (NTC)only in combination with F.91NTC defective, NTC cable defective, defective plug connection on NTC,defective plug connection on actoSTOR electronicsF.10 Flow NTC short circuit NTC defective, short circuit in cable harness, cable/casingF.11 Return NTC short circuit NTC defective, short circuit in cable harness, cable/casingF.12 Short circuit at cylinder charging sensor (NTC)only in combination with F.91NTC defective, short circuit in cable harness, cable/casingF.13 VU-/VUW boiler: Short circuit warm start sensor/cylinder sensorVUW boiler with actoSTOR: Short circuit cylindersensor (NTC) only in combination with F.91NTC defective, short circuit in cable harness, cable/casingF.20 Safety switch-off: temperature limiter Incorrect earth connection between cable harness and boiler, flow orreturn NTC defective (loose connection), black discharge via ignitioncable, ignition plug or ignition electrodeF.22 Safety switch-off: low water pressure No or low water pressure in the boiler, water pressure sensor defective,cable to pump or water pressure sensor loose/not connected/defectiveF.23 Safety switch-off: Temperature difference too great Pump blocked, insufficient pump output, air in boiler, flow and returnNTC interchangedF.24 Safety switch-off: Temperature rise too fast Pump blocked, poor pump performance, air in boiler, system pressuretoo low, non-return valve blocks/incorrectly installedF.25 Safety switch-off: Flue gas temperature too high Break in plug connection for optional flue gas safety thermostat (STB),break in cable harnessF.26 Fault: Gas valve without function Gas valve stepper motor not connected, multiple plug on the PCB notplugged in correctly, interruption in cable harness, gas valve steppermotor defective, electronics defectiveF.27 Safety switch-off: Flame simulation Moisture on the electronics, electronics (flame monitor) defective, gassolenoid valve leakingF.28 Failure during start-up: ignition unsuccessful Gas meter defective or gas pressure regulator has triggered, air in gas,gas flow pressure too low, thermal isolator device (TAE) has triggered,condensate duct blocked, incorrect gas restrictor, incorrect ET gas valve,fault on the gas valve, multiple plug on PCB incorrectly plugged in, breakin cable harness, ignition system (ignition transformer, ignition cable,ignition plug, ignition electrode) defective, ionisation current interrupted(cable, electrode), incorrect earthing of boiler, electronics defectiveF.29 Failure during operation: Re-ignition unsuccessful Gas supply temporarily stopped, flue gas recirculation, condensate ductblocked, faulty earthing of boiler, ignition transformer has spark failureF.32 Fan fault Plug at fan not correctly plugged in, multiple plug on PCB not correctlyplugged in, break in cable harness, fan blocked, Hall sensor defective,electronics defectiveF.35 Air/flue gas duct fault Air/flue gas duct blockedF.42 Coding resistance fault (possible in combinationwith F.70)Short circuit/interruption in coding resistance output range (in cableharness at heat exchanger) or gas group resistor (on PCB)13.2 Fault codes