Vaillant ECOTEC EXCLUSIVE 627 VU 256/5-7 Installation And Maintenance Instructions Manual

Vaillant ECOTEC EXCLUSIVE 627 VU 256/5-7 Installation And Maintenance Instructions Manual Manual pdf 43 page image

Appendix0020193966_01 ecoTEC exclusive Installation and maintenance instructions 43Status code Parameter MeaningS.98 Flow/return temperature sensor self-test Flow/return sensor test running, heating demands areblocked.S.99 Vaillant self-test Self-testD Overview of fault codesNoteSince the code table is used for various products, some codes may not be visible for the product in question.Code Parameter Possible causesF.00 Interruption: Flow sensor NTC plug not plugged in or has come loose, multiple plug on the PCBnot plugged in correctly, interruption in cable harness, NTC defectiveF.01 Interruption: Return sensor 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: DHW outlet sensor Only in conjunction with F.91NTC defective, NTC cable defective, defective plug connection on NTC,defective plug connection on the actoSTOR electronicsF.03 Interruption: Cylinder sensor Only in conjunction with F.91NTC defective, NTC cable defective, defective plug connection on NTC,defective plug connection on the actoSTOR electronicsF.10 Short circuit: Flow sensor NTC defective, short circuit in cable harness, cable/housingF.11 Short circuit: Return sensor NTC defective, short circuit in cable harness, cable/housingF.12 Short circuit: DHW outlet sensor Only in conjunction with F.91NTC defective, short circuit in cable harness, cable/housingF.13 Short circuit: Cylinder sensor Combination product: Warm start sensor/cylinder sensor short circuitCombination product with actoSTOR: Short circuit cylinder sensor (NTC)only in combination with F.91NTC defective, short circuit in cable harness, cable/housingF.20 Safety switch-off: Temperature limiter Incorrect earth connection between cable harness and product, flow orreturn NTC defective (loose connection), stray spark via ignition cable,ignition plug or ignition electrodeF.22 Safety switch-off: Low water pressure No or insufficient water in the product, water pressure sensor defective,cable to pump or water pressure sensor loose/not connected/defectiveF.23 Safety switch-off: Temp.spread too large Pump blocked, insufficient pump output, air in product, flow and returnNTC connected the wrong way roundF.24 Safety switch-off: Temp. incr. too fast Pump blocked, insufficient pump output, air in product, system pressuretoo low, non-return valve blocked/incorrectly installedF.25 Safety switch-off: Flue temp. too high Break in plug connection for optional flue gas safety cut-out (SCO),break in cable harnessF.26 Fault: Fuel valve not working Gas valve assembly stepper motor not connected, multiple plug on thePCB not plugged in correctly, interruption in cable harness, gas valveassembly stepper motor defective, electronics defectiveF.27 Safety switch-off: Flame simulation Moisture on the electronics, electronics (flame monitor) defective, gassolenoid valve leakingF.28 Start-up failure: Ignit. unsuccessful Gas meter defective or gas flow monitor has triggered, air in gas, gasflow pressure too low, thermal isolator device (TAE) has triggered, con-densate route blocked, incorrect gas injector, incorrect spare part gasvalve assembly, value in D.052 does not correspond to the printed valueon the current gas valve assembly, fault on the gas valve assembly, mul-tiple plug on PCB incorrectly plugged in, break in cable harness, ignitionsystem (ignition transformer, ignition cable, ignition plug, ignition elec-trode) defective, ionisation flow interrupted (cable, electrode), incorrectearthing of product, electronics defectiveF.29 Start-up failure: Ignit. unsuccessful Gas supply temporarily stopped, flue gas recirculation, condensate routeblocked, defective earthing of product, ignition transformer has sparkfailureF.32 Fault: Fan Plug on fan not correctly plugged in, multiple plug on PCB not correctlyplugged in, break in cable harness, fan blocked, Hall sensor defective,electronics defective