TROUBLE SHOOTING
EN / WHISPER 12 Ultra - Three phase for mobile applications / December 2008 / Copyright © 2008 Mastervolt 33
5.2.2 Trouble shooting table engine
PROBLEM CAUSE SOLUTION
Diesel engine fails to crank, the
starter makes clicking noises, or
the engine cranks very slowly
• Almost certainly this is an electrical
problem. Display will indicate “LOW
START BAT”
The problem must be an electric malfunction.
• Starter battery switched "OFF". Check position of the battery switch and switch
"ON".
No reaction at all
• Faulty fuse on the control panel
Replace fuse
• Starter battery voltage insufficient
(battery too weak).
Check battery voltage. Recharge the battery.
Inspect battery terminals and cables for a good
electrical connection (inspect against corrosion,
tattered wires, etc.)
• Too thick engine lubricating oil.
Change oil for a lower viscosity.
• Wiring control system faulty
During the normal starting process, the battery
voltage drops to 11V (with a fully charged
battery). If the voltage does not drop during
starting, the electrical connection is faulty. If the
battery voltage drops lower than 11V, then the
battery has been discharged too deep.
No reaction or clicking noises,
or slow cranking
• Starter motor faulty
Repair the starter motor
• Out of fuel or faulty fuel, water in the
fuel.
Fill up with fuel or replace with better quality.
• Fuel solenoid is not opening (no “click”
can be heard).
Check wire connections and circuitry to solenoid.
(Refer to DC wiring diagram)
• Fuel lift pump is not working.
• Fuel filter is blocked.
• Air in fuel lines.
Check fuel filter and fuel lift pump: clean or
replace if necessary.
Bleed air from fuel system (refer to maintenance
section).
• Wrong valve clearance.
Adjust valve clearance,
• Low compression because of dirty
valves.
Clean valves. Take off the injection bent and
inspect the outlet port. When little rust in the port
clean the valve by taking off the valve spring and
rotate until rust is removed. When the outlet port
is strongly affected by rust, the exhaust system is
not properly installed (refer to paragraph 5.4.3).
Contact Mastervolt service department for advice.
• Blocked injector.
Have the injector tested and cleaned if necessary.
Starter is turning engine
smoothly, but engine fails to
start
• Loss of compression by wear out or
damage
Repair by Mastervolt service
• Unsuitable contaminated fuel
• Lack of fuel.
Fill up with fuel or replace by better quality.
• Choked fuel filter.
Check fuel filter and fuel lift pump: clean or
replace if necessary.
• Disturbances on the electrical system/
user side.
Check if electrical load is fluctuating
• Faulty fuel lift pump.
Check and repair
• Choked air filter element.
• Lack of air.
Check the air intake
• Choked exhaust system, exhaust
blocked,.
Check the exhaust piping; inspect manifold inside
• Air in the fuel pipes
Bleed air from fuel system (refer to maintenance
section).
• Faulty electronic governor
Replace faulty parts.
• Blocked injector.
Have the injector tested and cleaned if necessary.
• Wrong valve clearance.
Adjust valve clearance.
• Temporarily hunting (this will disappear when engine has run in).
Engine runs irregularly.
• Ongoing hunting caused by faulty
electronic governor
Replace faulty parts.
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