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Part # MPSM07 (03/24/08)
Moisture + Gas Heat Generation & Temperature Regulation System Troubleshooting guide
Check:
•Inlet Gas
•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
Is it an Ignition box
problem?
Yes
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..
Does the unit heat up? |
| No | |
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Yes |
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•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 flame sensor..
•Recall for heat at the oven panel, while you watch the flame current reading..
Flame current should be no less than 0..3 microamps
-steady
•This modules will try for a stable burner flame 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?
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!
OK?
No
Display Check: |
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• “Heat” should be |
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displayed on the | No | |
digital readout.. | ||
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•Temperature values should display while actual heat is increasing..
•Oven should reach set temperature and cycle burner off..
Page 47
Does the product |
| No |
cook correctly? |
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Baking Cavity
Checks..
•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..
Yes
Yes |
| Call Garland Technical |
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| You | Service |
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| found |
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| cause! |
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Tell technical service
representative the checks
you made, and your
observations.