LG HB6422BRU Installation And Operating Instructions Manual page 14

Instructions for the installer
6.3 Arrangement of burners on hob
6.4 Lubrication of gas taps
After a while, the gas tap may become hard to turn or lock. If this
happens, it has to be cleaned inside and re-greased.
This must be done by a qualified technician.
14
BURNERS
1. Auxiliary
2. Semi-rapid
3. Rapid
4. Rapid
5. Ultra rapid