In Case Of Difficulty - Honeywell RTH4300B Guide D'installation

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In case of difficulty

About your new thermostat
If you have difficulty with your thermostat, please try the following suggestions.
Most problems can be corrected quickly and easily.
Display is blank
Heating or
cooling system
does not respond
• Check circuit breaker and reset if necessary.
• Make sure heating & cooling power switches are on.
• Make sure furnace door is closed securely.
• Make sure fresh AA alkaline batteries are correctly installed
(see page 14).
• Set System switch to Heat. Make sure the temperature is set higher
than the Inside temperature.
• Set System switch to Cool. Make sure the temperature is set lower than
the Inside temperature.
• Check circuit breaker and reset if necessary.
• Make sure heating & cooling power switches are on.
• Make sure furnace door is securely closed.
• Wait 5 minutes for the system to respond.
RTH4300B Programmable Thermostat


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