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Appendix A: Troubleshooting
89
The temperature sensor has been
disconnected or has broken wires.
2. The temperature reading is -20° F
or -30° C.
Problem
Temperature Monitoring:
Examine the wires to temperature sensor and
connect or replace wiring.
Try moving the unit to a different location.
a) Temperature sensing may be affected by
a source of ambient heat (ie., direct
sunlight, or heat duct proximity).
4. Temperature reading is inaccurate.
3. Temperature reads 150° F
or 65° C.
Temperature sensor wires are touching or
have shorted.
Verify and correct wiring.
b) Temperature may require calibration.
After moving or placing the unit away from
ambient heat sources, the temperature may
be calibrated to offset inaccurate normal
reading by several degrees. Refer to
Chapter 5, Section 5.6.
Cause
Solution
1. Can’t program temperature limits;
or the unit won’t read the
temperature sensor.
The input isn
’
t configured to read a
temperature sensor.
Press SET and CONFIGURE to program the
input. (See Section 5.1.1 for more informa-
tion on configuring inputs.)
c) The unit is using the wrong temperature
scale (Fahrenheit vs. Celsius).
Verify temperature scale. See Chapter 5,
Section 5.5.