Trane LO manual Electric Heat Not Operating Probable Cause Explanation

Tracer® ZN.010

and ZN.510

Table 18. Electric Heat Not Operating

Probable Cause	Explanation
Normal operation	The controller cycles electric heat on and off to meet the unit capacity require-
	ments.
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 on page 51.
Diagnostic present	A specific list of diagnostics affects electric heat operation. For more informa-
	tion, see the “Diagnostics” section on page 50.
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, electric heat does not operate. For the
controller	controller to operate normally, a 24VAC input voltage must be applied. 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 typical
	unit wiring diagrams in the Appendix of this manual.

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