Troubleshooting Guide - Honeywell T8131C Owner's Manual

Troubleshooting Guide

IF...
Display will not come on.
Temperature display will not go lower
than 45 F (7 C) or higher than 88 F
(31 C) during programming.
Temperature change occurs at the
wrong times.
Heating will not come on.
THEN...
Check that the green light emitting diode (LED)
located to the left of the LCD is lit, indicating the
thermostat is powered properly.
The temperature setting limit was reached. The setting
range is 45 F to 88 F (7 C to 31 C).
Verify the program times for the period. Be sure that
AM and PM indications are correct. Make sure the current
day and time are correct. Reprogram if necessary.
Check that the green LED is lit.
Check that the switch on the thermostat is set to HEAT.
Check the system fuse or circuit breaker and replace
or reset, if necessary.
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