Middleby Marshall PS640 - Manual (Page 26)

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III. QUICK REFERENCE: TROUBLESHOOTING
SYMPTOM PROBLEM SOLUTION
No electrical power • Check that the circuit breaker/fused disconnect is on. Make
sure the emergenct stop button is on. Oven will not
turn On.
No gas pressure
Burner did not light
• Make sure main gas is on.
• Turn oven off, and restart. If it still does not light, call for
service.
Oven will not
heat.
Air fingers may be as-
sembled incorrectly after
cleaning. • Turn oven off, and allow to cool. Reassemble fingers cor-
rectly. Oven is operating, but
little or no air is coming
from the fingers.
Oven is not up to operating
temperature.
Conveyor may be jammed.
• Allow oven to preheat.
• Turn oven off, and allow to cool. Check conveyor for block-
age.
Conveyor will not move.
SYMPTOM PROBLEM SOLUTION
Clean and replace the front
fan filters. • Failure to do this will eventually shut down the oven due to
excessive temperature. High Control Compartment
Temperature
The computer has detected
a problem with either the
main, or burner blowers. • This should be corrected by a qualified service technician. Main Blower problem or
Combustion Blower
problem.
SCREEN ALERTS
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