ELECTRIC COMBI OVENS - TROUBLESHOOTING
SYMPTOM |
| POSSIBLE CAUSES |
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Convection heat error light and steam heat | 1. | Cavity high temperature limit(s) open (manual reset). |
error light on. | 2. | Fuse F7 open. |
| 3. | Steam generator thermal fuse(s) open. |
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Cavity fan motor inoperative and cavity fan | 1. | Cavity fan motor values in the oven control configuration |
error light on. |
| setup are incorrect. See “CONFIGURATION MODE - |
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| PROGRAMABLE CONTROL” or “CONFIGURATION |
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| MODE MANUAL CONTROLS” in “SERVICE |
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| PROCEDURES”AND ADJUSTMENTS”. |
| 2. | Motor shaft is rubbing against the opening in the rear of |
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| the cavity. |
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| NOTE: This may only occur when the cavity is at a high |
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| temperature. If this is true, then remove the motor and |
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| inspect the shaft for scratches. |
| 3. | Internal motor protector open. |
| 4. | Fuse F7 on relay board open. |
| 5. | Cavity high temperature limit(s) open (manual reset). |
| 6. | Steam generator thermal fuse(s) open. |
| 7. | Auxiliary contactor switch(s) on contactor KM1 or KM2 |
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| malfunction. |
| 8. | Cavity fan motor(s) malfunction. |
| 9. | Oven control malfunction. |
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Oven inoperative and displays are blank. | 1. | Incoming voltage to machine not present or incorrect. |
| 2. | Line fuses F8 and/or F9 open. |
| 3. | Voltage tap wire on power supply board not connected or |
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| connected to wrong voltage for the machine. |
| 4. | Fuse F1 and/or F2 on the power supply board open. |
| 5. | Ribbon cable connector to relay board and CPU board is |
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| not inserted properly. NOTE: Connector should snap into |
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| position. |
| 6. | Relay board connector (J6) and/or power supply board |
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| connector is not inserted properly. |
| 7. | Battery backup voltage low or near zero. |
| 8. | Power supply board and transformer (1T) malfunction. |
| 9. | Oven control board inoperative. |
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One or more service error light(s) at bottom | 1. | Water supply not on or clogged. |
of keypad come on. | 2. | Convection heat malfunction. |
| 3. | Steam generator heat malfunction. |
| 4. | Cavity fan malfunction. |
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Convection heaters inoperative. | 1. | No voltage to heating elements. |
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| A. Cavity high temperature limit(s) open (manual reset). |
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| B. Steam generator thermal fuse(s) open. |
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| C. Contactor(s) malfunction. See “HEATING MODE |
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| AND CAVITY FAN SPEEDS” under “ELECTRICAL |
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| OPERATION”. |
| 2. | Convection heating element(s) malfunction. |
| 3. | Relay board malfunction (K6, K7 relay) |
| 4. | Oven control board malfunction. |
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