Temperature sensor alarms occur when the sensor is defective or disconnected. Temperature sensors are not polarized and therefore can be connected in either orientation.


Troubleshooting


Possible Cause
Component to Check
Recommended Action
Temperature sensor disconnected/loose
Wire connection
Refer to the Temp Sensor Wiring diagram below.
Temperature sensor
Defective or wire broken
Sensor and wiring. Use the main menu to check current sensor readings
Replace irresponsive sensor after wiring is verified


Temp Sensor Wiring



Label

Description

rt1/ST1

Indoor Temp

rt2/ST1’

Backup Indoor

Et/ST2

Outdoor Temp

SU1/ST3

Unit 1 Supply Temp

SU2/ST3’

Unit 2 Supply Temp