Question about Honeywell Electronic Programmable Heat/Cool Thermostat - CT3300A100 Heater

1 Answer

Installed a honeywell rth7500 series thermostate, no air

With the system set on cool, the fan on auto, and the cool on, the a/c will not come on. There is heat coming from the vents.

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  • gator42_2001 May 11, 2010

    is this a heat pump tstat? if it is you will have to configurate it for heat or cooling o or b o is for cooling b is for heat,how do you have it wired?

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  • Master
  • 3,433 Answers

Heat/cool wires crossed. RC- is red cool make sure the batteries are good and room temp is higher than cool setting. good luck

Posted on Jun 01, 2009

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Posted on Jan 02, 2017

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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 )

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No... Aux. is auxiliary heat strip. This is usually a white or black wire its up to the choice of the installers preferance. O or orange wire. is used to the reversing valve on a heat pump. If you do have a heat pump there is a programing section inside the Honeywell t-stat. which should say heat pump or straight cool, then another section that will ask if you want the reversing valve to energize in heat or cool. most Heat Pump brands energize in cool the exception is Rheem and Ruud they energize in heat.

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