Ariston CLAS ONE R 24 Installation And Servicing Instruction page 52

MAINTENANCE GUIDE
Rotate the gas pipe
3
Disconnect the cable of the electrode and fan.
Remove the four nuts .
4
Remove the burner unit
5
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Remove the two screws and remove the electrode
6
Remove the ceramic fibre.
Remove the four screws and pull the burner toward you.
Always replace the burner gasket (*).
7
Verify and replace the other gaskets if they are damaged or
showing signs of deterioration