Vaillant ecoTEC exclusive SERIES Installation And Maintenance Instructions Manual

Also see for ecoTEC exclusive 832: Installation and maintenance instructions Installation and maintenance instructions

Contents

41ecoTEC exclusive installation and maintenance instructions / 0020017768_02Code Meaning CauseF.71 Constant value feed NTC Feed NTC faultyF.72 Flow and/or return sensor fault Flow and/or return sensor is faulty (tolerance too great)F.73 Signal water pressure sensor in the wrong range(too low)Line to water pressure sensor is interrupted or hasa short-circuit to 0V or water pressure sensor faultyF.74 Signal water pressure sensor in the wrong range(too high)Line to water pressure sensor has a short-circuit at 5V / 24Vor internal fault in water pressure sensorF.75 No sudden change in pressure was detected onturning on the pumpWater pressure sensor or/and pump defectiveToo little water in the appliance; check adjustable bypass;Connect expansion vessel in return;Air in the applianceF.76 Interruption in cable harness Cable harness faultyF.77 Condensate pump or return signal from accessorymodule heatingCondensate pump faulty or return signal from the exhaustgas flap has respondedcon No communication with the printed circuit board Communication fault between the display and the printedcircuit board in the switchgear boxTable 9.4 Error codes (continuation)9.2 Test programsSpecial functions can be triggered in the appliances byactivating various test programs.These programs are given in detail in the Table 9.5.• The test programmes P.0 to P.6 will be started when"Power ON" is turned on and the "+" button ispressed for 5 seconds simultaneously. The displayshows "P.0".• Press the "+" key to start counting the test pro-gramme number upwards.• Press the "i" to operate the appliance now and tostart the test programme.• Press "i" and "+" simultaneously to exit the test pro-grams. You can also exit the test programs by notpressing any button for 15 minutes.Display MeaningP.0Bleeding test program The heating circuit andthe hot water circuit are bled via the automaticbleeding valve (the cap of the automatic bleedingvalve must be released).P.1 Test programme where the appliance is operatedin full load after successful ignition.P.2Test program where the appliance is operated withminimum gas volume (ignition gas volume) aftersuccessful ignition.P.5Test function for the safety temperature limiter (STL):The burner is switched on with maximum output,the temperature controller is switched off so that theburner heats until the software STL responds by rea-ching the STL temperature on the flow or return sensor.P.6Filling/draining programme:The preference changeover valve moves to the centreposition. The burners and pump are switched off.Table 9.5 Test programmes9.3 Resetting parameter to factory settingsBesides the option to reset individual parameters manu-ally to the factory settings specified in Tables 9.2 and 9.3,you can also reset all parameters simultaneously.• Change the value in the 2nd diagnosis level under di-agnosis point "d.96" to 1 (see Section 9.1.2).The parameters of all adjustable diagnosis points nowcorrespond to the factory settings.Replacing components 10