Honeywell T8131C Owner's Manual - Page 15

Troubleshooting Guide

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Troubleshooting Guide IF... Display will not come on. THEN... s Check that the green light emitting diode (LED) located to the left of the LCD is lit, indicating the thermostat is powered properly. Temperature display will not go lower s The temperature setting limit was reached. The setting than 45°F (7°C) or higher than 88°F range is 45°F to 88°F (7°C to 31°C). (31°C) during programming. Temperature change occurs at the wrong times. s 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. Heating will not come on. s Check that the green LED is lit. s Check that the switch on the thermostat is set to HEAT. s Check the system fuse or circuit breaker and replace or reset, if necessary. 15 69-0812-2

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15
69-0812—2
Troubleshooting Guide
IF…
THEN…
Display will not come on.
■
Check that the green light emitting diode (LED)
located to the left of the LCD is lit, indicating the
thermostat is powered properly.
Temperature display will not go lower
■
The temperature setting limit was reached. The setting
than 45
°
F (7
°
C) or higher than 88
°
F
range is 45
°
F to 88
°
F (7
°
C to 31
°
C).
(31
°
C) during programming.
Temperature change occurs at the
■
Verify the program times for the period. Be sure that
wrong times.
AM and PM indications are correct. Make sure the current
day and time are correct. Reprogram if necessary.
Heating will not come on.
■
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.