Question about Honeywell Programmable Thermostat Heater

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Rth230b blows cold air when set on heat - Honeywell Programmable Thermostat Heater

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If this is a gas fired furnace, their could be a manual limit needing to be reset...if you reset it, & it happens again, you need to call someone to check out the problem

Posted on Dec 12, 2013

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My Honeywell thermostat isnt keeping my house cool even though the temp is set to 69. Currently 90 degrees in here


Its probably not the thermostat. The air conditioner may be stuck on heating mode. If its a reverse cycle, the reversing valve may be jammed so even when the thermostat is calling for cold air, it stays on heat. If the machine is on heating mode, it should be blowing cold air out of the outdoor unit of the air con. If its on cooling mode, the outdoor should be blowing hot air.

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A nice radiator and heater core flush should fix you up.

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Please go to the link and check graph "2.5 Installing the Batteries". Its really easy so it should be a piece of cake.https://customer.honeywell.com/resources/techlit/TechLitDocuments/69-0000s/69-1800.pdf

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When I turn on the heat in my 2004 mazda mpv the front air vents blow heat but the rear air vents are blowing cold. I have adjusted every setting is there something I am overlooking.


When I turn on the heat in my 2004 mazda mpvicon1.png the front air vents blow heat but the rear air vents are blowing cold. I have adjusted every setting is there something I am overlooking.

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1 Answer

I installed a Honeywell RTH230B model thermostat. The heat works fine, but the AC is blowing warm air. Wires from old system are as follows: Y=yellow; G=green; R=red; O=brown; C=blue; E=white (it looked...


the colors of old system are for heat pump.if you have a heat pump you need heat pump thurmostat and colrs will make more sense.if not,then you need to go into furnace to see what colors go where.yellow is cool, goes to compressor contactor,usually another wire going from furnace to outside unit.green is fan relay rh is heat call rc is cool call

Jan 01, 2011 | Honeywell Programmable Thermostat Heater

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How do I get my honeywell system up and going?


for now, put switches on thermostat to hear and press the up arrow button to the desired temp. All your programed temps will take more explaining and it would be best you secure a owners instruction book from home depot. oif anything, buy thr same thermostat and either keep it or return it . I'd keep it regardless, read the pmphlet,program you heat and a/c before returning for refund. Don't destroy packaging and give them back everything. You will also need two AAbatteries. Good luck.

Jun 11, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

No heat in zone with Honeywell rth230B


It is not your thermostat, it is an airbound zone. The gurgly noise you heard was that water and air flowing through the radiator. The zone needs to be purged either at the boiler, or through vents on the radiator. Hope this helps

Nov 01, 2008 | Honeywell Electronic Programmable...

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