Diagnostics; Table 28. Diagnostic Codes; Table 29. Latching Diagnostics, Reset Required; Table 30. Automatically Resetting Diagnostics - Trane PTAC-SVX01C-EN Installation, Operation And Maintenance Manual

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.
PTAC-SVX01C-EN

Troubleshooting

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 Diagnostic Diagnostic
Level Code Description
1 C1 Compressor Failure
(severest)
2 C2 Indoor Temperature
Unit Sensor Failure1
3 C3 Indoor Temperature
Display Sensor Failure
4 C4 Indoor Coil
Temperature Failure
5 C5 Outdoor Temperature
Failure
6 C6 Outdoor Coil
Temperature Failure
7 C7 Configuration
Corrupted
8 - No diagnostic present
Table 29. Latching diagnostics, reset
required
Code Diagnostic Description
C1 Compressor Failure
C7 Configuration Corrupted
Table 30. Automatically resetting
diagnostics
Code Diagnostic Description
C1 Indoor Temperature - No Backup
Available
C2 Indoor Temperature - Unit Sensor
Failure1
C3 Indoor Temperature - Display Sensor
Failure1
C4 Indoor Coil Temperature Failure
C5 Outdoor Temperature Failure
C5 Outdoor Coil Temperature Failure
Auxiliary
Compressor Heat
DISABLED ENABLED
ENABLED ENABLED
ENABLED ENABLED
ENABLED2 ENABLED
ENABLED, ENABLED,
run as PTEE run as PTEE
ENABLED, ENABLED,
run as PTEE run as PTEE
ENABLED ENABLED
ENABLED ENABLED
Description
OLP has had multiple trips (3)
configuration failure
Description
No source of indoor temperature is
available
Unit indoor temperature valid then not
valid
Display indoor temperature valid then not
valid
Indoor Coil Temperature valid then not
valid
Outdoor Temperature valid then not valid
Outdoor Coil temp valid then not valid
Indoor Fan
ENABLED
ENABLED
ENABLED
ENABLED
ENABLED,
run as PTEE
ENABLED,
run as PTEE
ENABLED
ENABLED
41