Garland MP-GS, MP-GD-10-S service manual Ok?

Part # MPSM07 (03/24/08)

Moisture + Gas Heat Generation & Temperature Regulation System Troubleshooting guide

Check:

•Inlet Gas Shut-off 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

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..

•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

•Temperature values should display while actual heat is increasing..

•Oven should reach set temperature and cycle burner off..

Page 47

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

Tell technical service

representative the checks

you made, and your

observations.