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    Ronnor2 Posts: 1, Reputation: 1
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    Jul 8, 2013, 06:52 PM
    p374-1800
    I have a Totaline P374-1800 thermostat that went blank... does this unit have a battery... I don't think so from what Ive read... This thermostat controls my heater and air... whats my next step! Any suggestions?

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