Middleby Marshall PS870 Series Gas Ovens PS870G Gas - Manual (Page 17)

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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
correctly. 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
The internal battery needs
to be replaced to retain
energy mode timings. • A qualified service technician should accomplish this. Battery Symbol in the
lower right hand corner
Clean and replace the
front fan filters. • Failure to do this will eventually shut down the oven due to
excessive temperature. High Control Compart-
ment 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.
IV. 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