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Part # MPSM07 (03/24/08) Page 47
Does the product
cook correctly?
Check:
• Inlet Gas Shut-o Valve is open.
• Electrical power is connected and on.
• Check for Display Status, if unit has a deluxe panel.
• Security of MPO door.
• All water connections are tight, inlet pressure is > 30 psi.
• Incoming gas pressure is within specs.
Preliminary
Checks
Restart Oven:
( Control panel on )
• Observe automatic call for heat if oven cavity was
cool.
• Verify Convection Blower motor is up to speed.
• Insure temp. quickly increases to set temp.
Yes
Does the unit heat up?
No
Baking Cavity
Checks.
No
• Check probe for cleanliness , security,
and circuit for proper resistance value
changes per probe chart. (If unit uses a
deluxe panel, complete the calibration
check using the panel diagnostics
sequence.
Is it an Ignition box
problem?
Restart for heat while
checking MV output
Voltage.
Module Check:
• Check for 24 VAC
input!
• Check for 24 VAC
output from MV
terminal on module
during call for heat!
Display Check:
• “Heat” should be
displayed on the
digital readout.
• Temperature values
should display
while actual heat is
increasing.
• Oven should reach set
temperature and cycle
burner o.
OK?
You
found
cause!
Call Garland Technical
Service
1-800-424-2411
Yes
Yes
No
No
Tell technical service
representative the checks
you made, and your
observations.
• Select the lower scale of microamps on your multi-
meter.
• Connect the red lead to the sense terminal on the
module, and the black lead to the sense wire that is
routed to the direct ignition ame sensor.
• Recall for heat at the oven panel, while you watch the
ame current reading.
Flame current should be no less than 0.3 microamps
- steady
• This modules will try for a stable burner ame 4 times,
and if not successful, will then lock out. A recall for heat
will them be required.
• The following results should be determined:
- Did the ignitor produce a spark?
- During ignition, did the burners light?
- Did the burners remain on?
Yes
Moisture + Gas Heat Generation & Temperature Regulation System Troubleshooting guide