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20 69-0628B—1
Problem Check Action
Clock does not run. thermostat connections at the
two C terminals. If no
connections, clock needs
batteries in order to run.
Batteries may not have been
installed. 2
Install batteries as shown in Fig. 2.
Batteries may need
replacement.
Replace with two new AAA alkaline batteries as
shown in Fig. 2.
if new batteries are installed
and clock still does not run.
Replace thermostat.
voltage across the two
C terminals.
Remove thermostat from the wallplate or
subbase and measure the voltage. Refer to the
Voltage at Clock Terminals table for cause and
reaction.
Troubleshooting (Continued)
1 Applicable to heating-cooling subbase only.
2 If clock is not battery powered, clock can use batteries for backup.
Continued
20


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