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    clevin01's Avatar
    clevin01 Posts: 3, Reputation: 1
    New Member
    		  
    #1

    Jan 24, 2010, 11:25 AM
    Honeywell Chronotherm IV Plus
    My readout screen is blank on my Honeywell Chronotherm IV plus. I have a 5 zone system, and the other 4 work fine. Pushing buttons does not help.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Jan 24, 2010, 04:17 PM
    Exact model number
    clevin01's Avatar
    clevin01 Posts: 3, Reputation: 1
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    #3

    Jan 24, 2010, 10:26 PM
    Quote Originally Posted by hvac1000 View Post
    Exact model number
    It does not have a model number other thasn Chronotherm IV Plus.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
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    #4

    Jan 24, 2010, 11:26 PM
    Sorry I can be of no help without the exact model number but somewhere on the back side of the thermostat or subbase is a model number. They do not make them without it. Good luck.
    clevin01's Avatar
    clevin01 Posts: 3, Reputation: 1
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    #5

    Jan 26, 2010, 12:51 PM

    OK... I see numbers on the back of the thermostat... T8601D2019 and 0413 onm the back.. The subbase has the numbers 32207415 and 0413. I didn't think they looked like model numbers.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
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    #6

    Jan 27, 2010, 03:32 AM
    Your thermostat manual
    See page 11 under SYMPTOM (Display will not come on)

    http://customer.honeywell.com/techli...0s/69-1410.pdf
    jmcortese's Avatar
    jmcortese Posts: 1, Reputation: 1
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    #7

    Jan 12, 2012, 02:20 PM
    Just happened to me. Lifted the cover off (bottom first!), replaced the three double-A batteries, and voilą!
    riverhouse's Avatar
    riverhouse Posts: 2, Reputation: 1
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    #8

    Jul 21, 2013, 09:44 AM
    How should the wires be hooked up if I have separate air conditioning and heat? I have the blue wire attached to the rc screw. Nothing attached to the O screw. I have the red white yellow and green attached. Which one are for the air conditioner? The air conditioner is not working.
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