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| Model 291 |
| In the event of a control system failure, the digital | |
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| display shows an error message. These messages |
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| are coded: “E4”, “E5”, “E6”, “E10”, “E15”, “E41”, |
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| “E46”, “E47”, “E48”, “E70B” and “E92”. An alarm |
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| sounds when an error code is displayed, and to silence |
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| this alarm, press any button. |
DISPLAY | CAUSE | PANEL BOARD CORRECTION |
Control board | Turn switch to OFF position, then turn switch back ON; | |
| overheating | if display shows |
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| check the louvers on each side of the unit for obstructions; |
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| check cooling fan, if present |
Shortening | Turn switch to OFF position, then turn switch back to ON; | |
| overheating | if display shows |
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| probe should be checked |
Temperature | Turn switch to OFF position, then turn switch back to ON; | |
| probe open | if display shows |
Temperature | Turn switch to OFF position, then turn switch back to ON; | |
| probe shorted | if display shows |
Highlimit | Reset the high limit by manually pushing up on the reset | |
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| button; if high limit does not reset, high limit must be replaced |
Drain switch | Close drain, using the drain valve handle; if display still | |
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| failure shows |
904 |