Middleby Marshall PS740E installation manual III. Quick Reference Troubleshooting, Screen Alerts

III. QUICK REFERENCE: TROUBLESHOOTING

SYMPTOM

PROBLEM

SOLUTION

Oven will not

No electrical power

• Check that the circuit breaker/fused disconnect is on. Make

turn On.

sure the emergenct stop button is on.

Oven will not

Faulty contactor

•

Replace contactor.

heat.

Faulty heater element

•

Replace element.

Oven is operating, but

Air fingers may be as-

• Turn oven off, and allow to cool. Reassemble fingers cor-

little or no air is coming

sembled incorrectly after

rectly.

from the fingers.

cleaning.

Conveyor will not move.

Conveyor may be jammed.

• Turn oven off, and allow to cool. Check conveyor for block-

age.

SCREEN ALERTS
			SYMPTOM			PROBLEM
High Control Compartment					Clean and replace the front
			Temperature		fan filters.
	Main Blower problem or				The computer has detected
		Combustion Blower			a problem with either the
				problem.	main, or burner blowers.

SOLUTION

•Failure to do this will eventually shut down the oven due to excessive temperature.

•This should be corrected by a qualified service technician.

	Control Over Temp				Front filters are clogged	• Clean or replace filters.
		Front belt jammed			Front belt has stopped	• Remove obstruction, and restart oven.
						• If no obstruction, call service.
		Rear Belt jammed			Rear belt has stopped	• Remove obstruction, and restart oven.
						• If no obstruction, call service.
			High Temp Error		Thermocouple or	• Call service
					PLC malfunction
			Belt off-Oven not		Normal operation until
				in temperature	Oven reaches operating
					temperature
Energy Saving Mode 1					Normal operation
Energy saving mode 2					Normal operation
Energy saving Mode 3					Normal operation

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