Honeywell CT3355A1003 Owner's Manual - Page 32

Troubleshooting Guide

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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... s Set the system switch to OFF. Remove batteries. Insert backward for at least five seconds to reset thermostat. Replace batteries correctly. Display should come on. s Make sure batteries are fresh and installed correctly. s Gently clean battery contacts using a soft pencil eraser. Do not use anything abrasive on the clips. s You have reached the temperature setting limit. The setting range is 45°F to 88°F (7°C to 31°C). s Check the program times for the period in question. Be sure that AM and PM indications are correct. Make sure the current day and time are correct. Reprogram if necessary. 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. s Check for correct wiring and good connections. 32 69-1012

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32
69-1012
Troubleshooting Guide
If…
Then…
Display will not come on.
■
Set the system switch to OFF. Remove batteries. Insert
backward for at least five seconds to reset thermostat.
Replace batteries correctly. Display should come on.
■
Make sure batteries are fresh and installed correctly.
■
Gently clean battery contacts using a soft pencil eraser.
Do not use anything abrasive on the clips.
Temperature display will not go
lower than 45
°
F (7
°
C) or higher than
88
°
F (31
°
C) during programming.
■
You have reached the temperature setting limit. The
setting range is 45
°
F to 88
°
F
(7
°
C to 31
°
C).
Temperature change occurs at the
wrong times.
■
Check the program times for the period in question. 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.
■
Check that the switch on the thermostat is set to HEAT.
■
Check the system fuse or circuit breaker and replace or
reset if necessary.
■
Check for correct wiring and good connections.