Vaillant ecoTEC plus 612 Instructions For Installation And Servicing

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

Contents

48 Instructions for installation and servicing ecoTECCode Meaning CauseF.00 Flow–NTC:NTC broken, NTC cable broken, Defective connection atNTC, Defective connection at electronicsFlow–NTC cable defective/broken, NTC faultyF.01 Return–NTC:NTC broken, NTC cable broken, Defective connection atNTC, Defective connection at electronicsReturn–NTC cable defective/broken, NTC faultyF.02 Drinking water outlet probe stopped (<-10 °C)(800 series only)NTC-connector not plugged in or loose, NTC defective multiconduc-tor on the electronics not plugged in correctly, cable defectiveF.10 Short circuit – flow–NTC (< 130 °C) NTC– plug shorted to casing, NTC defectiveF.11 Short circuit – return–NTC (< 130 °C)NTC defectiveNTC– plug shorted to casingF.13 Short circuit in tank sensor NTC defective, earth leak/short circuit in cable loom,damp plug connectionF.20 Over heat cut off activated Flow probe not correctly thermal-connected or defective, appliancedoes not shut downF.22 Dry fire Too little water in the appliance, water shortage switch defective,cable to pump or water shortage switch defective, pump blocked ordefective, pump output too lowF.23 Water shortage, temperature spread between flow andreturn probe too largePump blocked or defective, pump output too lowF.24 Water shortage, temperature rise too quick Pump blocked, insufficient pump output, air in appliance, plant pres-sure too low, flow and return NTC interchangedF.27 Secondary light, the ionisation signal reports a flame inspite of gas valve being turned offSecondary light, gas solenoid valves defective, flame detectordefectiveF.28 Appliance does not start: Attempts to ignite during startfailedFaults in the gas supply such as:- Gas meter or gas pressure detector defective- Air in gas- Gas flow pressure too low- Fire protection tap has disengagedFaults in the gas fitting (main gas magnet or operator defective),wrong gas setting, igniter (ignition transformer, ignition cable, igni-tion plug) defective, ionisation current stopped (cable, electrode),faulty earthing in appliance, electronics defectiveF.29 Flame goes off during operation and subsequent ignitionattempts failedGas supply temporarily stopped, ignition transformer has spark fail-ure, faulty earthing of applianceF.32 Fan speed variation (too high on start) Fans blocked, plug not inserted correctly on fan, hall sensor defec-tive, fault in cable harness, electronics defectiveF.60 Gas–valve control + defective Short circuit/earth (ground) leak in cable loom to gas valves, gasvalve assembly defective (earth/ground leak from coils), electroniccontrol system defectiveF.61 Gas–valve control – defective Short circuit/earth (ground) leak in cable loom to gas valves, gasvalve assembly defective (earth/ground leak from coils), electroniccontrol system defectiveF.62 Gas valve shutoff delay defective Gas fitting leaking, electronics defectiveF.63 EEPROM error Electronics defectiveF.64 Electronics/sensor fault Short-circuit in flow or return sensor or electronics defectiveF.65 Electronics temperature too high Electronics too hot due to external effect, electronics defectiveF.70 No valid DSN in AI and/or BMU Spare part failure AI and motherboard interchanged at same timeF.71 Flow sensor reports constant value Flow sensor is defectiveF.72 Flow and/or return sensor fault Flow and/or return sensor is defectiveF.73 Water pressure sensor or cable harness hydraulicsdefectiveLine to water pressure sensor is broken or has a short-circuit at 0 Vor water pressure sensor defectiveF.74 Water pressure sensor or cable harness defective Line to water pressure sensor has a short-circuit at 5 V / 24 V orinternal fault in water pressure sensorF.75 No sudden change in pressure was detected on turningon the pumpWater pressure sensor or/and pump defectiveToo little water in appliance; check adjustable by-passF.76 Overheating protection on primary heat exchanger trig-gered, damage in primary heat exchangerCable or cable connection of fuse in the primary heat exchangerdefective, replace primary heat exchangerTable 8.4 Error codes8 Troubleshooting