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W.McLain Ultra 310 Series 2 control module conversion to series 4 U-Control

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PlumbErwin
PlumbErwin Member Posts: 1
in Thermostats and Controls
So here it goes, first post.......
Working on a Ultra 310 Series 2 today. Found out control module failed. Got new control, opened box and "OH SNAP!!" No more Honeywell......
Spent the day installing the new control. Went to fire up and getting a error of "open limits". Figured out that the new module needs the Supply and Return Sensors (they didnt come with the new U-Control). Those are on the way, will install and hopefully the new control module will light up blue and stay blue. Boiler is just running hot with primary loop circulation.
Anyone have any helpful additional advice for me?

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  • HVACNUT
    HVACNUT Member Posts: 5,841
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    The Series 2 the limits are pretty brittle. Maybe order a full maintenance kit. 

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