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    beer bubba's Avatar
    beer bubba Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Dec 13, 2008, 11:47 AM
    Heat not turning off when temp. reached?
    Hello,

    I have a hot water boiler and a Honeywell CT3500 programmable thermostat (just moved in). The heat works, but does not turn off even after the thermostat stops (10 degrees or so higher.. ).

    I have done some research for the probable cause. The first one that I believe is not the case is a stuck zone valve (2 zone home). This does not appear to be it.
    What I believe it to be is that it is an older, 3 wire zone/boiler, and that most thermostats are not compatible with it.

    Any help is appreciated!!
    KC13's Avatar
    KC13 Posts: 2,556, Reputation: 99
    Ultra Member
    		  
    #2

    Dec 13, 2008, 11:56 AM

    Someone else had this issue recently, and hvac1000 produced a list of compatible thermostats. Hang tight, I'm sure he'll be around soon...
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #3

    Dec 13, 2008, 12:33 PM
    These thermostats from White rodger are compatable with 3 wire zone valves.

    Model Number Programming Options Contacts Profile Terminals

    1E35-910 Non-Programmable Sealed Mercury Cell Vertical 4, 5, 6
    1F35-910 Non-Programmable Sealed Mercury Cell Horizontal 4, R5, Y6
    1F90-371 5+1+1, 5+2 Electronic Horizontal RC, RH, W, Y, G, MV, O, B, +, S, -, 6
    1F96-344 Non-Programmable Electronic Horizontal RC, RH, W, Y, G, MV, O, B, +, S, -, 6
    1F97-371 7-Day Electronic Horizontal RC, RH, W, Y, G, MV, O, B, +, S, -, 6
    1F95-1277 Touch Screen 7-Day, 5+1+1, or Non-Programmable Electronic Horizontal RC, RH, C, W/E, W2, Y, Y2, G, O, B, 6, L, +, S, -
    1F97-1277 Touch Screen 7-Day, 5+1+1, or Non-Programmable Electronic Horizontal RC, RH, C, W, Y, G, O, B, W/E, L, 6, +, S, -
    1F97-391 7-Day Electronic Horizontal RC, RH, W, Y, G, 6, HM1, HM2, S1, S2, S3
    1F80-0471 5+1+1, 5+2, or Non-Programmable Electronic Horizontal RC, RH, C, W, Y, G, O/B
    1F86-0471 Non-Programmable Electronic Horizontal RC, RH, C, W, Y, O/B
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