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Mechanical Diagnosis
CONDITION POSSIBLE CAUSE REMEDY
Unit switch ON—nothing happens Dead battery Recharge or replace battery
Remote switch off (optional) Turn on
Circuit breaker open Replace or reset
Corroded battery connections Clean and tighten
Fusible link blown Check for shorted main harness and
replace fusible link
Unit switch ON—indicator lights
come on but engine does not
crank
Battery low Replace or recharge battery
Circuit breaker open Turn OFF unit for 10 seconds
Starter solenoid defective Repair or replace
Starter relay defective Replace relay
Corroded battery connections Clean and tighten
Starter clutch defective Replace
Starter defective Repair or replace
Starter switch defective Replace
Engine cranks but FAILS to start Misadjusted fuel solenoid linkage Adjust
Fuel solenoid defective Replace solenoid
No fuel or wrong fuel in tank Fill fuel tank. After filling a
completely empty tank, first bleed
fuel system.
Engine too cold Use winter preheat procedure
Glow plugs defective Replace glow plugs
Air in fuel system Bleed fuel system. During this
operation, it can also be determined
if the fuel lines are tight and filters
clean.
Speed/run relay malfunction Check relay or unit thermostat
Insufficient compression Measure compression pressure. If
necessary, grind valves or replace
piston
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