Middleby Marshall PS638E - PS638 TROUBLESHOOTING INFORMATION; Troubleshooting Guide

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IV. PS638 TROUBLESHOOTING INFORMATION
A.
TROUBLESHOOTING GUIDE
SYMPTOM POSSIBLE CAUSES SOLUTIONS
Nothing displayed on controller
1. Power not connected
2. Main breaker not on
3. Control circuit breaker tripped
1. Check plug at wall
2. Check main breaker
3. Check control breaker
WOW OVEN or other screen
saver image can be seen
Control is in OFF/STANDBY mode.
No problem – screen saver
appears when the oven is not
turned on for use. Press BACK
button.
Oven not baking properly
1. Settings have been changed
2. Kitchen airflow conditions
affecting the bake
1. Confirm correct values and
check that the oven is set
properly (time and
temperature)
2. Eliminate air cross-currents in
area
Conveyor noticeably running at
the wrong speed
Time settings have been changed
Confirm correct values and correct
control settings
Conveyor not moving
1. Something has jammed the
conveyor
2. Circuit breaker has tripped
3. Chain has come loose from the
sprocket
4. Oven is not at operating
temperature
1. Turn power off. Locate and
remove jam item.
2. Check conveyor for jamming
and Reset the breaker (right
side control door).
3. With power OFF, remove chain
cover, replace chain onto
sprocket and replace chain
cover.
Oven not heating
1. Gas not turned on to oven
2. Burner has stopped running
1. Turn on manual valve on
supply to oven
2. Turn the oven off and back on
again to clear the notification
and relight
 Arrange for service if the
problem reoccurs
“BAKING” indication goes on and
off in the control display
Oven is cycling normally. BAKING
indication comes on upon triggering
the photo eye.
No problem – the timed baking
cycle automatically starts when
product breaks the photo eye beam
and stops after product leaves the
baking chamber.
Oven does not enter BAKING
mode when product is placed on
the belt.
Photo eye not working.
Enter MONITORING SCREEN to
see eye trigger (manager access).
and/or turn Energy Mode to OFF.
Oven will now run in BAKING
mode all the time. Call service to
schedule repair.
Baked product comes out
underdone.
Photo eye not working. Check to
see if BAKING appears on display
when photo eye beam is interrupted
Enter MONITORING SCREEN
(manager access) to see if eye
triggers PLC. And/or turn Energy
Mode to OFF. Oven will now run in
BAKING mode all the time. Call
service to schedule repair.