BCXC-SVX01A-EN 55
Maintenance
Diagnostics
Table M-D-6. Electric Heat Not Operating
Probable Cause Explanation
Normal operation The controller cycles electric heat on and off to meet the unit capacity
requirements.
Requested mode: off It is possible to communicate the operating mode (such as off, heat, cool)
to the controller. When off is communicated to the controller, the units shuts
off the electric heat.
Communicated disable Numerous communicated requests may disable electric heat, including an
auxiliary heat enable input and the heat/cool mode input. Depending on the
state of the communicated request, the unit may disable electric heat.
Manual output test The controller includes a manual output test sequence that verifies analog
and binary output operation and associated output wiring. However, based
on the current step in the test sequence, the electric heat may not be on.
Refer to the “Manual Output Test” section.
Diagnostic present A specific list of diagnostics affects electric heat operation. For more informa-
tion, see the “Diagnostics” section.
Unit configuration 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 device, the electric heat may not work properly.
No power to the If the controller does not have power, the unit fan does not operate. For
controller the Tracer
®
ZN010,510 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.
Unit Wiring The wiring between the controller outputs and the electric heat contacts
must be present and correct for normal electric heat operation. Refer to the
unit wiring diagrams on the unit.
Table M-D-7. Fresh Air Damper Stays Closed
Probable Cause Explanation
Warmup and cooldown The controller includes both a warmup and cooldown sequence to keep the
fresh air damper closed during the transition from unoccupied to occupied.
This is an attempt to bring the space under control as quickly as possible.
Requested mode: off It is possible to communicate the operating mode (such as off, heat, cool) to
the controller. When off is communicated to the controller, the unit closes the
fresh air damper.
Manual output test The controller includes a manual output test sequence that verifies analog
and binary output operation and associated output wiring. However, based
on the current step in the test sequence, the fresh air damper may not be
open. Refer to the “Manual Output Test” section .
Diagnostic present A specific list of diagnostics effects fresh air damper operation. For more
information, see the “Diagnostics” section.
Unit configuration 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 device, the damper may not work correctly.
No power to the If the controller does not have power, the unit fan does not operate. For
controller the Tracer
®
ZN010,510 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.
Unit wiring The wiring between the controller outputs and the fresh air damper must be
present and correct for normal damper operation. Refer to thelunit wiring
diagrams on the unit.
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