Quick Reference: Troubleshooting; Screen Alerts - Middleby Marshall PS740E Owner's Operating And Installation Manual

III. QUICK REFERENCE: TROUBLESHOOTING
SYMPTOM
Oven will not
turn On.
Oven will not
heat.
Oven is operating, but
little or no air is coming
from the fingers.
Conveyor will not move.

SCREEN ALERTS

SYMPTOM
High Control Compartment
Temperature
Main Blower problem or
Combustion Blower
problem.
Control Over Temp
Front belt jammed
Rear Belt jammed
High Temp Error
Belt off-Oven not
in temperature
Energy Saving Mode 1
Energy saving mode 2
Energy saving Mode 3
PROBLEM
No electrical power
Faulty contactor
Faulty heater element
Air fingers may be as-
sembled incorrectly after
cleaning.
Conveyor may be jammed.
PROBLEM
Clean and replace the front
fan filters.
The computer has detected
a problem with either the
main, or burner blowers.
Front filters are clogged
Front belt has stopped
Rear belt has stopped
Thermocouple or
PLC malfunction
Normal operation until
Oven reaches operating
temperature
Normal operation
Normal operation
Normal operation
• Check that the circuit breaker/fused disconnect is on. Make
sure the emergenct stop button is on.
• Replace contactor.
• Replace element.
• Turn oven off, and allow to cool. Reassemble fingers cor-
rectly.
• Turn oven off, and allow to cool. Check conveyor for block-
age.
• Failure to do this will eventually shut down the oven due to
excessive temperature.
• This should be corrected by a qualified service technician.
• Clean or replace filters.
• Remove obstruction, and restart oven.
• If no obstruction, call service.
• Remove obstruction, and restart oven.
• If no obstruction, call service.
• Call service
21
SOLUTION
SOLUTION