Trane Tracer VV550 User Manual

CNT-SVX17G-EN 83
Troubleshooting
Resetting Diagnostics
A reset clears latching diagnostics and enables the controller to try to run normally. If the latching
condition is still present after the reset, the controller shuts down. A reset resets a unit that is
running normally. There are five ways to reset unit diagnostics:
• Manual output test at the controller
• Cycling power to the
controller
• BAS (communicated status request,
clear alarm)
• Rover
™ service tool (communicated status request, clear alarm)
• A communicating device able to access the cont
roller diagnostic reset input (communicated
status request, clear alarm)
1 Low airflow
Low primary airflow preventing electric
reheat fr
om turning On
1 Thumbwheel in */** position
The thumbwheel setpoint and the
thumbwhe
e
l star and double star
function are enabled in configuration.
The thumbwheel setpoint is cranked all
the way to the single star or the double
star position.
Table 54. No diagnostics present
Level Reported alarm message text Description
P Power-up reset
No diagnostic occurred since the last
reset
0 Normal
Diagnos
tics that automatically reset are
clea
red
Table 55. Green status LED blink pattern during manual test
Reported alarm message text Blink pattern during manual test
Invalid unit configuration Twice (output override diagnostic)
Controller failure Twice (output override diagnostic)
Discharge air temperature failure
(ventilation flow control with reheat)
Twice (output override diagnostic)
Dichroic air temperature failure
(ventilation flow control without reheat)
Once
Discharge air temperature failure 
(space temperature control or flow tracking
Once
Primary air temperature failure Once
Local space setpoint failure Once
Space temperature failure Twice (output override diagnostic)
Flow sensor failure Twice (output override diagnostic)
Flow sensor calibration failure Twice (output override diagnostic)
Freeze protection active Once
a. Losing the network variable input does not generate a diagnostic if the local sensor
is present and vice versa.
b.Do not send a diagnostic message if the input (local or network variable input) is
never present.
Table 53. Automatically resetting diagnostics
Level Reported alarm message text Description

Trane Tracer VV550 Specifications

General

Brand	Trane
Model	Tracer VV550
Category	Controller
Language	English