Baxi 424 Combi 2 Installation And Service Manual page 5

8.2 Start-up ............................................................................................................................................................................................... 51
8.2.1 Procedure for first start-up .......................................................................................................................................... 51
8.2.2 Changing the heating flow temperature .................................................................................................................... 51
8.2.3 Changing the domestic hot water (DHW) temperature ........................................................................................... 51
8.3 Shutdown. ...................................................................................................................................................................................... 52
8.3.1 Switching off the heating and domestic hot water (DHW) ...................................................................................... 52
8.4 Degassing function ....................................................................................................................................................................... 52
8.5 Frost protection ............................................................................................................................................................................. 52
9 Settings ........................................................................................................................................................................................................ 53
9.1 Accessing the settings. ................................................................................................................................................................ 53
9.2 List of parameters. ........................................................................................................................................................................ 53
9.2.1 Resetting factory settings .................................................................................................................................................. 57
9.3 Setting the parameters. ............................................................................................................................................................... 57
9.3.1 Setting the heating curve .................................................................................................................................................. 57
9.4 Reading out measured values ................................................................................................................................................... 58
9.4.1 Statuses and sub-statuses. .............................................................................................................................................. 59
9.5 Reading meters. .......................................................................................................................................................................... 61
10 Maintenance ............................................................................................................................................................................................. 62
10.1 General ........................................................................................................................................................................................... 62
10.2 Maintenance message ................................................................................................................................................................. 63
10.2.1 Service notification ..................................................................................................................................................... 63
10.2.2 Resetting the displayed maintenance message ..................................................................................................... 63
10.2.3 Resetting the upcoming maintenance message ..................................................................................................... 64
10.3 Standard inspection and maintenance operations................................................................................................................... 65
Annual servicing .......................................................................................................................................................... 66 Annual servicing .......................................................................................................................................................... 66
10.3.1
10.3.2 Checking the water pressure ..................................................................................................................................... 64
10.3.3 Checking the expansion vessel .................................................................................................................................. 64
10.3.4 Checking the flue gas discharge and the air supply ............................................................................................... 65
10.3.5 Checking the combustion ........................................................................................................................................... 65
10.3.6 Checking the automatic air vent ................................................................................................................................ 65
10.3.7 Cleaning the siphon .................................................................................................................................................... 65
10.3.8 Electrode distances ...................................................................................................................................................... 65
10.3.9 Checking the burner and cleaning the heat exchanger .......................................................................................... 67
10.3.10 Water unit ..................................................................................................................................................................... .67
10.3.11 Cleaning/replacing the DHW filter.............................................................................................................................. 65
10.3.12 Removing limescale .................................................................................................................................................... 67
10.4 Specific maintenance operations .. ...............................................................................................................................................68
10.4.1 Detection/ignition electrode replacement ..................................................................................................................68
Dismantling the water-water exchanger ................................................................................................................... 68
10.4.2
Replacing the flow and return sensors.....................................................................................................................68
10.4.3
Replacing the return valve .........................................................................................................................................69
10.4.4
Replacing the 3-way valve ......................................................................................................................................... 69
10.4.5
Replacing the pressure sensor.................................................................................................................................. 69
10.4.6
Replacing the hall effect sensor.................................................................................................................................70
10.4.7
Replacing the safety pressure relief valve ............................................................................................................... 70
10.4.8
Replacing the diverter valve motor.............................................................................................................................70
10.4.9
10.4.10 Replacing the pump........ ............................................................................................................................................ 71
10.4.11 Replacing the expansion vessel ................................................................................................................................. 71
10.4.12 Replacing the PCB ....................................................................................................................................................... 71
11 Troubleshooting. .................................................................................................................................................................................... 72
11.1 Temporary and permanent faults ............................................................................................................................................... 72
11.2 Error codes .................................................................................................................................................................................... 72
12 Decommissioning ................................................................................................................................................................................. 77
12.1 Disassembly .................................................................................................................................................................................. 77
12.2 Recommissioning ...........................................................................................................................................................................77
13 Disposal .................................................................................................................................................................................................78
13.1 Disposal and recycling ................................................................................................................................................................. 78
Contents
Combi 2 5