Miller Electric Big Blue 452P Wiring harness and components, Shutdown switch is released Out

Trouble	Remedy
Engine cranks but does not start.	Press Magnetic Shutdown switch MS1 when starting engine.
	Check fuel level.
	Reset circuit breaker CB13 (see Section 9-8). Have Factory Authorized Service Agent check engine-
	wiring harness and components.
	Check battery and replace if necessary. Check engine charging system according to engine manual.
	Have Factory Authorized Service Agent check control relay CR2, and fuel solenoid FS1.
	Air in fuel system. See engine manual.
Engine starts, but stops when Magnetic	When starting engine, continue holding Magnetic Shutdown switch until after engine indicator lights go
Shutdown switch is released.	out.
	Check oil, and coolant levels. Automatic shutdown system stops engine if oil pressure is too low or coolant
	temperature is too high (see Sections 5-7and 9-9).
Engine hard to start in cold weather.	Use starting aid switch (see Section 6-1or 7-1).
	Keep battery in good condition. Store battery in warm area off cold surface.
	Use fuel formulated for cold weather (diesel fuel can gel in cold weather). Contact local fuel supplier for
	fuel information.
	Use correct grade oil for cold weather (see Section 9-1).
Engine suddenly stops.	Check oil and coolant levels. Automatic shutdown system stops engine if oil pressure is too low or coolant
	temperature is too high (see Sections 5-7and 9-9).
	See engine manual.
Engine slowly stopped and cannot be	Check fuel level.
restarted.
	Check engine air and fuel filters (see Sections 9-3and 9-7).
	See engine manual.
Battery discharges between uses.	Turn Engine Control switch off when unit is not running.
	Clean top of battery with baking soda and water solution; rinse with clear water.
	Recharge or replace battery if necessary.
	Periodically recharge battery (approximately every 3 months).
Engine idles, but does not come up to	Have Factory Authorized Service Agent check idle module PC7 and current transformer CT1.
weld speed (models with idle option
only).
	Check for obstructed throttle solenoid.
Engine does not run at idle speed	CC models: place Stick/TIG Selection switch in Stick position.
(models with idle option only).	CC/CV models: place Process/Contactor switch in any position but Remote-TIG.
	Check for obstructed throttle solenoid.
	Have Factory Authorized Service Agent check idle module PC7, and control relays CR3 and CR6.
Engine uses oil during run-in period;	Dry engine according to run-in procedure (see Section 11).
wetstacking occurs.

OM-496 Page 54 Return To Table Of Contents