Troubleshooting
Diagnostics
The controller is equipped to display a diagnostic code through the interface module; if the display is not present (Class 2 control), there is no method to retrieve the diagnostic codes from the unit.
If there is no interface module to indicate the presence of a diagnostic, service will only be triggered by a comfort or operational complaint.
The controller will only display the most severe diagnostic present.
Translating Multiple
Diagnostics
The controller senses and records each diagnostic independently of other diagnostics. It is possible to have multiple diagnostics affect the operation of the unit, but only the most severe diagnostic will be displayed.
Resetting Diagnostics
A reset clears any latching diagnostics and allows the control to try to run the PTAC normally. If the latching condition is still present after the reset, the control will shut down the PTAC. A reset will reset a unit that is running normally. A reset is just like cycling power to the unit.
There are two ways to reset diagnostics:
1.Manual output test at the controller
2.Cycling power to the controller
Manual Output Test
When manual test has been initiated, the controller exercises all outputs in a predefined sequence. The last step of the sequence resets the controller. See the Manual output test section on page 22 for more information about the manual output test.
Cycling Power
When someone turns off the controller’s power, then
Table 28. | Diagnostic codes |
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Severity | Diagnostic | Diagnostic |
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Level | Code | Description |
| Compressor | Heat | Indoor Fan | |
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1 | C1 | Compressor Failure | DISABLED | ENABLED | ENABLED | ||
(severest) |
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2 | C2 | Indoor Temperature | ENABLED | ENABLED | ENABLED | ||
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| Unit Sensor Failure1 |
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3 | C3 | Indoor Temperature | ENABLED | ENABLED | ENABLED | ||
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| Display Sensor Failure |
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4 | C4 | Indoor Coil |
| ENABLED2 | ENABLED | ENABLED | |
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| Temperature Failure |
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5 | C5 | Outdoor Temperature | ENABLED, | ENABLED, | ENABLED, | ||
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| Failure |
| run as PTEE | run as PTEE | run as PTEE | |
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6 | C6 | Outdoor Coil |
| ENABLED, | ENABLED, | ENABLED, | |
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| Temperature Failure | run as PTEE | run as PTEE | run as PTEE | ||
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7 | C7 | Configuration | ENABLED | ENABLED | ENABLED | ||
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| Corrupted |
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8 | - | No diagnostic present | ENABLED | ENABLED | ENABLED | ||
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Table 29. Latching diagnostics, reset |
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Code | Diagnostic Description | Description |
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C1 | Compressor Failure | OLP has had multiple trips (3) |
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C7 | Configuration Corrupted | configuration failure |
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Table 30. Automatically resetting diagnostics
Code | Diagnostic Description | Description |
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C1 | Indoor Temperature - No Backup | No source of indoor temperature is |
| Available | available |
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C2 | Indoor Temperature - Unit Sensor | Unit indoor temperature valid then not |
| Failure1 | valid |
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C3 | Indoor Temperature - Display Sensor | Display indoor temperature valid then not |
| Failure1 | valid |
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C4 | Indoor Coil Temperature Failure | Indoor Coil Temperature valid then not |
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| valid |
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C5 | Outdoor Temperature Failure | Outdoor Temperature valid then not valid |
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C5 | Outdoor Coil Temperature Failure | Outdoor Coil temp valid then not valid |
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