TESTING & TROUBLESHOOTING
Use this chart with the appropriate wiring diagram, also found in this manual
Mechanical Control
PROBLEM | POSSIBLE CAUSE | CORRECTIVE ACTION | |
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Fan will not Run | No Power to Oven | Turn power on | |
| No Power to Oven | Check Light circuit – IF OK, Select “Cook” and Check | |
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| Timer circuit.. IF OK, Check Door Micro Switches | |
| Micro switch not OPENING | Check connections & switch functions.. | |
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| (Caution: the switch components on this control | |
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| system pass 115 v.. a..c.. through switch contacts..) | |
| Fast Control |
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PROBLEM | POSSIBLE CAUSE | CORRECTIVE ACTION | |
Key Pad Buttons Not | Defective key pad | Use key pad diagnostics / pin outs test points | |
Responding |
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Loose ribbon connection at key pad | Check connection | ||
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PROBE ERROR in display | Faulty Probe | Replace probe | |
| Loose probe connection | Check connections | |
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HI TEMP In display | Oven at too high a temp for product | Allow oven to cool | |
HELP In display | Faulty Probe | Replace probe | |
| Motor centrifugal switch stuck | Check centrifugal switch | |
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| Gas valve (s), or Ignition System | Check heat generation system – ( Refer to Service | |
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| procedures (Heat generation system) | |
Unit will not shut off | Unit above 150°F | Put unit into cool down, open door slightly | |
No HIGH speed But LOW | Bad key pad | Use diagnostic KEY PAD TEST | |
speed works |
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Bad K2 relay on board | Check for voltage out of K2 relay | ||
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| Bad motor | Check motor | |
No LOW speed But HIGH | Bad key pad | Use diagnostic KEY PAD TEST | |
speed works |
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Bad K2 relay on board | Check for voltage out of K3 | ||
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| Bad motor | Check motor | |
Display is BLANK NO | Bad transformer | Check for 24VAC out of TR1 transformer | |
POWER |
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Bad harness connection | Check connections | ||
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Unit will not heat | No power out of K4 relay | Check for power out of K4 relay | |
| No power out of Ignition Module MV | Complete a flame current check to osolate | |
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| Gas valve shutoff switch open, PV, MV, | Check for MV power at gas shutoff switch, and that | |
| or both valves stuck closed | PV and MV opens on call for heat | |
| Motor centrifugal not closing | Check motor centrifugal switch | |
Motor stops, then after a | Thermal Trip on motor | Inspect rear clearance | |
period of time comes back |
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| Motor air intake is clear of lint/debris | ||
on |
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| Replace motor | ||
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Page 46 | Part # MPSM07 (03/24/08) |