If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con-
tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call
216-383-2531 or 1-800-833-9353.

PROBLEMS
(SYMPTOMS)

POSSIBLE AREAS OF
MISADJUSTMENT(S)

RECOMMENDED
COURSE OF ACTION

ENGINE PROBLEMS

Engine idles down to low idle but
will not stay at low idle.

1. Remove any external load on

the welder terminals or auxiliary
power receptacles.

2. The engine low idle RPM may

be set too low. Contact your
local Lincoln Electric Field
Service Facility.

1. The engine low idle RPM may

be set too low. Perform the
Engine Throttle Adjustment
Test.

2. With the idler control switch in

the “AUTO” position and all
external loads removed, check
for 12VDC at leads #208 and
#209. See Wiring Diagram. If
the 12VDC is present and the
solenoid does not stay activat-
ed, the solenoid may be faulty.
Replace.

Engine will not go to high idle when
attempting to weld or when the
auxiliary power is loaded. Welding
output and auxiliary power output
is normal when idler control switch
is in the “HIGH” position.

Check work and electrode
cables for loose or faulty con-
nections.

2. The mechanical linkage be-

tween the solenoid and engine
may be stuck.

1. Locate plug J2 on the control

board. With a load on the
machine, measure the AC volt-
age across the two leads in plug
J2. Normal is 1.0 VAC mini-
mum. If the correct voltage is
present, the idler P.C. board
may be faulty. Replace.

2. If the correct voltage is NOT

present at Plug J2 leads, check
the continuity of the leads from
the current transformer to plug
J2. See Wiring Diagram.

3. The current transformer may be

faulty. Replace.

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