Troubleshooting guide – Honeywell Electronic Programmable Thermostat User Manual
Page 12
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12
Troubleshooting Guide
I
F…
THEN…
Display will not come on.
■
Set the system switch to OFF. Remove batteries. Insert
backward for at least five seconds to reset thermostat.
Correctly replace batteries. 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
■
The temperature setting limit is reached. The setting
lower than 45
°
F (7
°
C) or higher
range is 45
°
F to 88
°
F (7
°
C to 31
°
C).
than 88
°
F (31
°
C) during
programming.
Temperature change occurs at
■
Check program times for the period in question. Be sure
the wrong times.
that AM and PM indications are correct. Make sure the
current day and time are correct. Reprogram if neces-
sary.
Heating will not come on.
■
Check that switch on thermostat is set to HEAT. Allow a
minimum of five minutes for time-guard protection to
expire.