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PTAC-SVX01C-EN 41
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 re-applies
power, the unit cycles through a
power up sequence. By default, the
controller will attempt to reset all
diagnostics at power up.
Diagnostics present at power up and
those that occur after power up will
be handled according to the defined
unit diagnostics sequences (see
Diagnostics table below)
Table 28. Diagnostic codes
Severity
Level
Diagnostic
Code
Diagnostic
Description Compressor
Auxiliary
Heat Indoor Fan
1
(severest)
C1 Compressor Failure DISABLED ENABLED ENABLED
2 C2 Indoor Temperature
Unit Sensor Failure1
ENABLED ENABLED ENABLED
3 C3 Indoor Temperature
Display Sensor Failure
ENABLED ENABLED ENABLED
4 C4 Indoor Coil
Temperature Failure
ENABLED2 ENABLED ENABLED
5 C5 Outdoor Temperature
Failure
ENABLED,
run as PTEE
ENABLED,
run as PTEE
ENABLED,
run as PTEE
6 C6 Outdoor Coil
Temperature Failure
ENABLED,
run as PTEE
ENABLED,
run as PTEE
ENABLED,
run as PTEE
7C7Configuration
Corrupted
ENABLED ENABLED ENABLED
8 - No diagnostic present ENABLED ENABLED ENABLED
Table 29. Latching diagnostics, reset
required
Code Diagnostic Description Description
C1 Compressor Failure OLP has had multiple trips (3)
C7 Configuration Corrupted configuration failure
Table 30. Automatically resetting
diagnostics
Code Diagnostic Description Description
C1 Indoor Temperature - No Backup
Available
No source of indoor temperature is
available
C2 Indoor Temperature - Unit Sensor
Failure1
Unit indoor temperature valid then not
valid
C3 Indoor Temperature - Display Sensor
Failure1
Display indoor temperature valid then not
valid
C4 Indoor Coil Temperature Failure Indoor Coil Temperature valid then not
valid
C5 Outdoor Temperature Failure Outdoor Temperature valid then not valid
C5 Outdoor Coil Temperature Failure Outdoor Coil temp valid then not valid
Troubleshooting