TABLE 37: UNIT CONTROL BOARD FLASH CODES
Flash Code | Description | |
On Steady | Control Failure - Replace Control | |
Heart Beat | Normal Operation | |
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1 Flash | Not Applicable | |
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2 Flashes | Control waiting ASCD* | |
3 Flashes | HPS1 - Compressor Lock out | |
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4 Flashes | HPS2 - Compressor Lock out | |
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5 Flashes | LPS1 - Compressor Lock out | |
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6 Flashes | LPS2 - Compressor Lock out | |
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7 Flashes | FS1 - Compressor Lock out | |
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8 Flashes | FS2 - Compressor Lock out | |
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9 Flashes | Ignition Control Locked Out/ | |
Ignition Control Failure / Limit Switch Trip / No Jumper Plug in Heat Section | ||
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10 Flashes | Compressors Locked Out On Low | |
Outdoor Air Temperature* | ||
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11 Flashes | Compressors Locked Out Because The | |
Economizer Is Using Free Cooling* | ||
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12 Flashes | Fan Overload Switch Trip - Not Applicable On This Unit * | |
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13 Flashes | Compressor Held Off Due To Low Voltage* | |
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14 Flashes | EEPROM Storage Failure (Control Failure) | |
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OFF | No Power or Control Failure |
*. These flash codes do not represent alarms.
| Monitored | No |
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| Programming? | No |
| Call for | No | Loss of | Yes | ||||||||||
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| Problem? |
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| Heating? |
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| Program |
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| Trip/Failure |
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| Control |
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| Heat |
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Heat Off
Call for 2nd
Stage
Cooling
No
Monitor |
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| No |
Turn off ID | Yes | Fan on |
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Blower Motor |
| >30 secs? |
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| Yes |
| No | Lossof Call |
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| for ID Blower? |
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| Energize ID | |
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| Blower Motor | |
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| Yes |
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| No | Fan off | ||
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| >10 secs? | |
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| Yes |
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| No | Call for | ||
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| ID Blower? | |
Call for | Yes | |
Cooling? |
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| No |
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No | Loss of Call | Yes |
| for Cooling? |
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First
Stage?
Yes
Call for 1st
Stage
Cooling
Cool Off
FIGURE 24 - BASIC TROUBLESHOOTING FLOWCHART
40 | Unitary Products Group |
