AIR N ARC
®
150 SERIES
SECTION 6: TROUBLESHOOTING
090043-OP_r0 (MARCH - 2015)
PAGE - 47
VANAIR MANUFACTURING, INC.
(800) 526-8817 • www.vanair.com
ENGINE (CONTINUED)
Improper Control Operation:
Engine does not speed up (cont.)
Fuel filter partly plugged
Replace fuel filter. Refer to the Engine
Owner’s Manual.
Faulty pilot valve
Readjust or replace pilot valve.
Faulty pressure switch
Replace pressure switch.
Improper Control Operation:
Engine does not slow down
Leak in control line
Check for leaks; replace line if necessary.
Pilot valve out of adjustment or
malfunctioning
Pressure settings may need to be reset.
Faulty pressure switch
Replace pressure switch.
Throttle solenoid stuck
Check throttle solenoid. Replace if
necessary.
Check throttle relay; replace if necessary.
Governor stuck
Free governor and lubricate if necessary.
Engine overheats
Located too close to obstruction.
Move further from obstruction.
Low oil level
Check engine oil level; Refer to the Engine
Owner’s Manual; replenish as necessary.
Restricted cooling air in or out
Clean engine intake grill.
RPMs too fast
Adjust speed.
Engine stops during operation
Low oil level
Check engine oil level; Refer to the Engine
Owner’s Manual; replenish as necessary.
Low fuel
Check fuel gauge. Fill as necessary.
Engine overloaded
Reduce demand/Turn off one function.
Engine idle set too low
Adjust idle to proper speed.
Fouled spark plug
Check spark plug and replace if necessary.
Refer to the Engine Owner’s Manual.
Engine will not throttle up for
various functions
Faulty throttle solenoid
Check throttle solenoid; replace if
necessary.
Check throttle relay; replace if necessary.
Blown system fuse
Check system fuse; replace if necessary.
Faulty pilot valve
Replace pilot valve.
Faulty pressure switch
Replace pressure switch.
Gradual loss of engine power
Contaminated fuel
Drain and replace fuel supply.
Wrong fuel type fill
Use only gasoline—do not use E85, etc.
Refer to Engine Owner’s Manual for
information on engine fuel type to use.
Continued on next page
6.2 TROUBLESHOOTING GUIDE
Fault/Malfunction
Possible Cause
Corrective Action
