REMEHA Calenta 25s, Installation And Service Manual

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6 Switching off the boiler ............................................................................71
6.1 Installation shutdown .........................................71
6.2 Frost protection ..................................................71
6.3 Switching off the central heating ......................72
6.4 Shutting down domestic hot water
production ...........................................................72
7 Checking and maintenance .....................................................................73
7.1 Maintenance message ........................................73
7.2 Preventive maintenance with automated service
message ..............................................................73
7.2.1 Resetting the automatic maintenance
message ................................................................74
7.2.2 Dealing with the next maintenance message and
starting the new maintenance period ....................74
7.3 Standard inspection and maintenance
operations ...........................................................75
7.3.1 Checking the hydraulic pressure ...........................75
7.3.2 Checking the ionization current .............................75
7.3.3 Checking the transfer capacity ..............................75
7.3.4 Checking the tightness of the flue gas evacuation and
air inlet connections ..............................................76
7.3.5 Checking combustion ............................................76
7.3.6 Checking the automatic air vent ............................77
7.3.7 Checking the safety valve .....................................77
7.3.8 Checking the siphon ..............................................77
7.3.9 Checking the burner and cleaning the heat
exchanger .............................................................78
7.4 Specific maintenance operations ......................79
7.4.1 Replacing the ionization/ignition electrode ............79
7.4.2 Cleaning the plate exchanger (domestic hot water
end) and the water filter cartridge .........................79
7.4.3 Replacing the 3-way valve ....................................82
7.4.4 Replacing the non-return valve .............................83
7.4.5 Assembling the boiler ............................................84
8 Troubleshooting .......................................................................................85
8.1 Error codes ..........................................................85
8.2 Shutdowns and lock-outs ..................................88
8.2.1 Blockage ...............................................................88
8.2.2 Blocking .................................................................88
8.3 Error memory ......................................................90
8.3.1 Error readout memorised ......................................91
8.3.2 Deletion of the error display ..................................92
Contents
040412 - 7600585-01 4