AMX ViewStat - Manual (Page 44)

Support Module Installation and Wiring
38 ViewStat Communicating Thermostat
Troubleshooting Remote Sensors
Thermostat has no display: Check 24 VAC supply. Check for incorrect wiring between the
thermostat and support module. Incorrect wiring can damage the thermostat and transformer or
blow a fuse in the equipment.
Also, verify that all support modules have a unique address.
Thermostat displays very high temperature or humidity: Ensure that DIP switch 6 is set
properly. If DIP switch 6 is set to T1/T2 and a sensor has not been wired to the T1/T2 terminal, no
temperature or humidity readings will be displayed. Also, if DIP switch 6 is set to onboard and a
remote sensor has been wired to the T1/T2 terminal, incorrect temperature readings will be
displayed. Check wires on remote sensors (flush mount or outdoor/duct) to ensure that they are not
touching. If they are, separate them.
Thermostat displays very low temperature: Remote sensor (flush mount or outdoor/duct) is not
connected to support module properly. Check wiring.
Thermostat doesn't display remote temperature/humidity: Make sure that the support module
is set to address 1. Reset support module after changing any DIP switches by turning off power for
approximately 15 seconds.
Thermostat displays RH instead of °F or °F instead of RH: Make sure that monitor/control DIP
switches are set correctly. Reset support module after changing any DIP switches by turning off
power for approximately 15 seconds.