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My thermostat is no getting above 64 degrees even though I have it set at 80

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Need to know what type of furnace you have (eg. Gas, Electric, Heat Pump, etc.)

Posted on Dec 14, 2008

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Furnace does not shut off ... temp set at 68 degrees and its up to 80 degrees ... had to shut furnace by main switch ... is it the termostat


Easiest way to find out is to disconnect the thermostat or at least the red wire on the thermostat. If it stops, it's the thermostat. If it continues, you will need to disconnect the wire going to the R terminal on the control board. If it stops, it's a crossed thermostat wire. If it continues, its a problem with the control board or relay and you will need a technician.

Mar 09, 2010 | Honeywell CT3200 5-2 Day Electronic...

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Have a 1004fa model to heat a room. temp on


You may have a bad circuit board. Depending upon the age of the heater it may still be under warranty. Contact Rinnai (in US) 800-621-9419 with your serial number and installation date. Ask if they can offer a solution. Good Luck!

Jan 13, 2010 | Rinnai Heaters

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When this thermostat is in the HOLD position, which cancels the programmed feature, I set the temperature to 72 degrees and the furnace runs until that 72 degree temperature is obtained. Now the thermostat...


If you still have the instructions for the thermostat, then it will show you how to get into the menu and set the swing on the temps. I would try to explain off the top of my head, but its actually quite a bit off numbers to remember. Hope it helps somehow.

Dec 29, 2009 | Honeywell Focus 6300B 5-2 Days...

2 Answers

AC Thermostat is set to 78 but wont cool past 79 or 80


If your unit is running 24/7 you are either low on charge or the unit is to small for your house.
A 20° temperature difference is about normal for the room air vs the air coming out of the ducts, but the room air and the leaving air should keep getting colder and colder.
An air conditioner should cycle approximately 3 maybe 4 times in an hour if it's properly sized.
As for the thermostat thermometer they are very cheap and are more for reference than actual temperature, so if 78° is not comfortable, then you should set it lower but not rely on thermostat being accurate or what the thermometer is saying as long as it is consistent.
The air conditioner and thermostat can also be set below 78°, there's a lot of people set them at 72° and below with no problems.
the only thing is if you have real low humidity you'll need to watch indoor coil or the suction line (the big line) on your outdoor unit and make sure it doesn't freeze up on you.

Sep 13, 2009 | Honeywell CT87B ROUND HEATING&COOLING...

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First floor of house is cold


The thermostat will turn your furnace on and off to satisfy the temperature setting at the location where the thermostat is located. If you move the thermostat to the first floor and set the thermostat at say seventy, it should keep the furnace on until the temperature near the thermostat hits seventy degrees.

Feb 06, 2009 | Honeywell Focus 6300B 5-2 Days...

1 Answer

Cooling Problems


Your filter is clogged. Not the one at the bottom of the unit.The one above the unit. It is like a raditor coils, kind of a bear to get to. We have cats and dogs the filter gets most of the hair but not all.Usualy about 6 bolts to take out.The proublem will be at the bottom of the top filter.

May 09, 2008 | Honeywell Electronic Programmable...

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