
Section Four - Part C
TROUBLESHOOTING and DIAGNOSIS
TROUBLESHOOTING GUIDE
| CONDITION | POSSIBLE CAUSE | SOLUTION | 
| 
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| Dryer will not run. | No power to unit. | Check voltage supply. | 
| 
 | Door switch not making. | Check door switch continuity. | 
| 
 | Thermal fuse open. | Check fuse continuity. | 
| 
 | Broken belt or belt switch. | Check for broken belt or check belt switch | 
| 
 | 
 | for continuity. | 
| 
 | Timer | Check timer contacts for continuity. | 
| 
 | Motor | Check motor windings for continuity,  | 
| 
 | 
 | ohms). | 
| 
 | Check PTS contacts R1 - R2, while push- | |
| 
 | 
 | ing start switch. Check PTS relay coil R2 | 
| 
 | 
 | - CT1 for continuity. | 
| 
 | 
 | 
 | 
| No heat in dryer. | Improper voltage supply. | Check for 240VAC. (electric dryer) | 
| 
 | Heater Element | Check heater continuity,  | 
| 
 | Gas Burner | Check for voltage (120VAC) to burner as- | 
| 
 | 
 | sembly. | 
| 
 | 
 | Check ignitor continuity. | 
| 
 | 
 | Check for gas supply. | 
| 
 | 
 | Check flame switch continuity, (0 ohms | 
| 
 | 
 | when cold). | 
| 
 | 
 | Check gas valves for continuity. | 
| 
 | Thermostat | Check thermostat for continuity. | 
| 
 | Thermal  | Check for continuity. | 
| 
 | mostat | 
 | 
| 
 | Motor centrifugal switch | Manually close centrifugal switch contacts, | 
| 
 | 
 | check for continuity,  | 
| 
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 | 
 | 
| Drum will not rotate. | Broken belt | Check belt. | 
| 
 | Broken belt switch | Check for continuity. | 
| 
 | Idler pulley binding. | Check for proper operation of idler pulley. | 
| 
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 | 
 | 
| Not heating enough. | Blocked air flow | Check lint filter, blower housing, internal | 
| 
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 | and external ducting and exhaust hood. | 
| 
 | Thermostat cycling too low. | Check exhaust temperatures for proper | 
| 
 | 
 | cycling. | 
| 
 | 
 | 
 | 
| Temperature too hot. | Thermostat heater open | Check heater for continuity,  | 
| 
 | 
 | ohms). | 
| 
 | 
 | Check selector and wiring for continuity. | 
| 
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 | 
 | 
| Auto cycle timer won’t | Timer | Check timer motor continuity,  | 
| advance. | 
 | ohms). | 
| 
 | Electronic control | See checkout procedure. | 
| 
 | Dryness sensor | See checkout procedure. | 
| 
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 | 
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