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Troubleshooting
Manual Output Test
You can use the Test button on the controller during installation or troubleshooting to verify proper
end device operation. When you press the Test button, the controller exercises all outputs in a
predefined sequence. The last step of the sequence resets the controller. See topic
Test," p. 28
step by step.
Cycling Power
When power to the controller cycles (24Vac turns OFF then ON), the controller initiates its power-
up/reset sequence. The controller attempts to reset all diagnostics at power-up. Diagnostics
present at power-up and those that occur after power-up are handled according to the defined unit
diagnostics sequences (see
Building Automation System
Some building automation systems can reset diagnostics in the controller. For more complete
information, refer to the building automation system product literature.
™
Rover
Service Tool
The Rover service tool can reset diagnostics in the controller. For more complete information, refer
to the Operation and Programming, Rover Version 5.0 user guide.
Diagnostic Reset
Devices that can communicate a network variable communicated status request ("clear_alarm"
request) can reset diagnostics in the controller.
Questionable Unit Operation
Table 56, p. 84
indicate problems:
•
•
•
•
Table 56. Reheat outputs do not energize
Probable cause
Power-up control wait
Requested mode Off
Diagnostic present
No power to the controller
Unit configuration
84
for more information on the manual output test function and how to perform this test
Table 50, p.
through
Table 59, p. 86
Reheat outputs do not energize
Fan output does not energize
Air valve and/or water valves stay open
Air valve and/or water valves stay closed
Explanation
When power-up control wait is enabled (non-zero time), the controller remains Off until one of two
conditions occurs:
• The controller exits power-up control wait once it receives communicated information.
• The controller exits power-up control wait once the power-up control wait time expires.
You can communicate a desired operating mode (such as Off, heat, and cool) to the controller. When Off
is communicated to the controller, the unit controls the reheat Off. There is no heating or cooling.
A specific list of diagnostics affects reheat operation. For more information on controller diagnostics, refer
to
Table 50, p.
81.
If the controller does not have power, the reheat does not operate. For the controller to operate normally,
it must have an input voltage of 24 Vac. When the green LED is Off continuously, the controller does not
have sufficient power or has failed. For more information on green LED, refer to
The controller must be properly configured based on the actual installed end devices and application. When
the unit configuration does not match the actual end devices, the reheat may not work correctly. Local
stages of reheat should start with Heat 1 output. Remote heat must be placed adjacent to the last local
reheat stage. One stage of local and remote heat, Heat 1 is local, Heat 2 is remote.
81).
provide probable causes and explanation for symptoms that
"Manual Output
"Green Status LED," p.
80.
CNT-SVX17G-EN
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