North Star 157117 Owner's Manual page 47

Inspect electrodes
Maintenance & Repair
Inspect electrodes yearly and replace as needed.
1) Loosen front (2) bolts using a 1/2" socket. Loosen side (2) bolts using a 1/2"
socket and wrench.
2) Remove (3) screws using a 5/32" hex key Allen wrench from the combustion
head. Lift off combustion head from
outer cover.
FRONT BOLTS (2)
SIDE BOLTS (2)
Fig06842
3) Disconnect flame sensor and electrode wires. Disconnect fuel line.
4) Clean off carbon deposits, which may have accumulated on the tips of the
electrodes.
5) If electrodes are outside of manufacturing specification, Replace electrodes.
NOTICE: Wipe combustion head flame sensor lens every 100 hours. If the flame
sensor lens gets sooted up the flame sensor will be unable to sense a flame and
therefore the burner will not fire. Do not contamminate or touch the fuel nozzle tip.
Fig06843
Fig06172
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