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Honeywell Thermostat RTH 7500

I had to install a new thermostat, I bought the Honeywell RTH7500, I have a multi stage heat pump. When I activate the thermostat for cool air, the fan will come on but no cool air, I can get the heat to work, but no A/C. Any suggestions?

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  • Gunston May 24, 2009

    I replaced a honeywell heat pump tstat T841 to a honeywell RTH7500 w/heat pump.



    I use the 7500 wiring setting on page 22, G, Y, O, R, and White to Aux, but use a small piece of wire to connect Aux & E. The Blue wire leave alone.



    Next go to 7500 Advance setting pg 13 and follow instructions.



    I used

    function-setting

    170-7

    190-0 (because I use the O wire)

    270-5 (I have a gas furnace)

    300-1

    320-0

    330-2

    500-1 (or 2)

    530-1

    640-12



    And it works just like a pro!

  • Anonymous Mar 21, 2014

    We've tried all the buttons and changing the batteries and flipping the circuit but we can't get the heat the come on.

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Assumed all the wiring are correct,

to change from manual switching from heat to cool, press [system] button ( left ) to go into system setting.

then press and hold the [fan] middle button untill option display 120

use up down button to select option 300 ( Manual/Autochangeover) ,

select 0 for manual, 1 for automatic. ( read caution in page 22 of installation manual )

Good luck

Posted on Oct 14, 2008

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Gunston,

You the man!

I had an old Baystat 239 that would never shut off. I bought the Honeywell RTH7500, couldn't get it to cool, found your solution online and moments later I had cool temps! Thanks for the help!

Posted on Jun 07, 2010

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The thermostat must be programmed (setup) for operation with your system. Check the manual for the settings for use with a multistage heat pump. If you are running a dual fuel system then be sure you also include this when you do your set up. In addition you must also set up the thermostat so that it will operate in the auto-change over mode.

Posted on Sep 30, 2008

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