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  1. 04-24-2006, 12:39 AM #1
    mrb8828
    mrb8828 is offline Regular Guest
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    I recently switched from a honeywell builder's grade thermostat to a Robertshaw 9715i. I was getting very short cycles (7-8 mins) from honeywell and now get 30-35 min run times with new Robertshaw thermostat. I have noticed that the yellow AUX light comes on from time to time during the cooling call. I know the stat is wired correctly (have triple checked it). I have a simple 1 cool/1 heat gas furnace with 5 wires coming into the stat (C,R,Y,G,W). Any ideas as to what would trigger this light to come on? Thanks for the help in advance.
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  2. 04-24-2006, 12:45 AM #2
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    smokin68
    smokin68 is offline Professional Member
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    The only thing that comes to mind is it's a multi-stage stat, and is calling for a second stage of cooling(even though there isn't one). I have the 9720.
    If everything was always done "by the book"....the book would never change.
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  3. 04-24-2006, 10:01 PM #3
    lyork
    lyork is offline Regular Guest
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    Yep, sounds like it's calling for the second stage, (which doesn't exist on your system) It's a 2 stage stat, so go in to the user settings and change your second stage differential to the max ( pretty sure it's 3 degrees) and set the time to 35 minutes. Should take care of seeing the "aux" light.
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