American Standard 340 manual Troubleshooting Guide, Symptom Possible Cause Action

TROUBLESHOOTING GUIDE

Symptom	Possible Cause	Action
Display will not	Thermostat is not	Check if the thermostat is mounted and
come on.	being powered.	latched on the 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 is in the Off
		position–set to Heat or Cool.
Temperature	The upper or lower	Check that the temperature setpoints are
settings will not	temperature limits	within range:
change (Example:	were reached.	Heating: 50	°	to 99° F (10 ° to 37° C)
cannot set the		Cooling: 50	°	to 99° F (10 ° to 37° C).
heating higher or the
cooling lower).
				(Contiuned)

	Pub. No. 12-5026-01
20	69-1609