Stihl TS 420 Manual page 14

Problem
No spark
TS 410, TS 420
Cause
Spark plug defective
Faulty insulation or short circuit in
short circuit wire or short circuit
switch
Break or damaged insulation in
ignition lead
Ignition module defective
Remedy
Replace spark plug
Check short circuit wire and switch,
replace switch if necessary
Check ignition lead, replace if
necessary
Replace ignition module
13