American Standard ASYSTAT500C manual Troubleshooting Guide, Symptom Possible Cause Action

TROUBLESHOOTING GUIDE

Symptom	Possible Cause		Action
Display does not come	Thermostat is not being		Check if the thermostat is mounted and latched on the
on.	powered.		wallplate—mount and latch the thermostat on the
			wallplate.
			Check if the circuit breaker is tripped—reset the circuit
			breaker.
			Check if the fuse is blown—replace the fuse.
			Check if the system switch at the equipment is in the Off
			position—set to the On position.
			Check wiring between thermostat and HVAC equipment —
			replace any broken wires.
			If 24 Vac is present, proceed with troubleshooting.
Temperature setting	The upper or lower temperature		Check that the temperature setpoints are:
does not change	limits were reached.		Heating: 55 to 85°F (13 to 29°C)
(Example: cannot set the			Cooling: 65 to 99°F (18 to 37°C).
heating higher or the
cooling lower).
			(continued)
			Pub. No. 12-5029-01
		60		69-1617