Echo HC-155 - Manual (Page 28)

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© 9/2013 ECHO Inc.
TROUBLESHOOTING HC-155
TROUBLESHOOTING
Fuel vapors are extremely flammable and may cause fire and/or explosion. Never test for ignition
spark by grounding spark plug near cylinder plug hole, otherwise serious personal injury may
result.
ENGINE PROBLEM TROUBLESHOOTING CHART
Problem Check Status Cause Remedy
Engine cranks -
starts hard/
doesn’t start
Fuel at carburetor No fuel at carburetor
Fuel strainer clogged
Fuel line clogged
Carburetor Clean or replace
Clean or replace
See your Echo dealer
Fuel at cylinder
No fuel at cylinder Carburetor See your Echo dealer
Muffler wet with fuel Fuel Mixture too rich
Open choke
Clean/replace air filter
Adjust carburetor
See your Echo dealer
Spark at end of
plug wire
No spark
Stop switch off
Electrical problem
Interlock switch Turn switch to ON
See your Echo dealer
See your Echo dealer
Spark at plug No spark
Spark gap incorrect
Covered with carbon
Fouled with fuel
Plug defective Adjust to .65mm (0.026 in.)
Clean or replace
Clean or replace
Replace plug
Engine runs,
but dies or
does not
accelerate
properly
Air filter Air filter dirty Normal wear Clean or replace
Fuel filter Fuel filter dirty
Contaminants/residues
in fuel
Replace
Fuel vent Fuel vent plugged
Contaminants/residues
in fuel
Clean or replace
Spark Plug Plug dirty/worn Normal wear Clean and adjust or replace
Carburetor Improper adjustment Vibration Adjust
Cooling System
Cooling system
dirty/plugged Extended operation in
dirty/dusty locations
Clean
Spark Arrestor
Screen Spark arrestor screen
plugged
Normal wear Replace
Engine does
not crank
N/A N/A Internal engine problem See your Echo dealer