Question about Honeywell CT87B ROUND HEATING&COOLING MECHANICAL THERMOSTAT - WHITE Heater

2 Answers

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

The unit is capable if it because I can also set it to 73 and it will got to 74 or 75, but never to 73. No matter what temperture the AC is set at its always 1 or 2 degress higher than the set temp. We had the AC guy out and he quite rudely said everything is fine. All he did was raise the internal temp of the thermostate up to 78 when it was 74 to verify that it shuts off and said it isnt made to go below 78 in Arizona. So I left it at 78 and then sure enough when the house warmed up to 79 it kicked on and stayed on never going below 79 or a very stuffy 80. So what do I do now, the warranty company I don't think will come again since this is the third call on it in a few weeks, (first time low freon, second time loose wire). He also said he would have to tell the company that the unit is working just fine with a 20 degree temperture split. The unit is a Puron High Efficency unit, which its so not right now since it runs 24/7!

Posted by on

Ad

2 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Guru:

    An expert who has written 7 tips or uploaded 3 video tips

  • Honeywell Master
  • 588 Answers

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.

Posted on Sep 14, 2009

Ad
  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that got 5 achievements.

    Governor:

    An expert whose answer got voted for 20 times.

    Hot-Shot:

    An expert who has answered 20 questions.

  • Expert
  • 55 Answers

Sounds like you might have a faulty tstat, or the only other possiblilty is the internal set point temperature on the tstat may be set to shut your system off when its at that one or two degree mark above your set temp. look for a manual on your model tstat or look it up online and try to get into the installer configurations and make the setpoint differential to 0 degrees

Posted on Sep 13, 2009

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

4 Answers

My Dometic digital thermostat wont go up past 32 degrees. What could be wrong?


Same problem...then discovered my thermostat was set to Celsius instead of Ferinheight... pressed toe temp up and temp down buttons to change..fixed...

Sep 16, 2014 | Dometic 3313192.000 White Single Zone LCD...

1 Answer

What does -AC on honeywell chronotherm III thermostat mean?


AC means "air conditioning." If the AC icon is showing on your thermostat it means that your air conditioning is activated and should come on when the temperature threshold you've set on the thermostat is reached.

For example, if you've set the temperature level to 78 degrees, when the house temperature goes above 78, usually by about two degrees, the air conditioner should cycle on to cool it back down to 78 degrees at which point it will then turn off.


This information should be in your air conditioning/heating system or thermostat owners manual. If you don't have the manual, you should contact your air conditioning dealer or your builder to secure a replacement. The manual is essential for proper operation and maintenance of your system.

May 14, 2014 | Heating & Cooling

1 Answer

My American Standard Heritage 11 unit was not working properly when i came home from work and the temperture in the house according to the thermostat show the temperture in the house to be 85 degree&#


the dual run capacitor is bad located in main panel of unit size of small red bull can it will be swelled up on top indicating it bad get on at electric motor or electric supply house most ac stores wont sell it has a rating like 35/5 370

Aug 27, 2012 | Heating & Cooling

1 Answer

My AC unit is 3 years old. its set at 72 but wont go below 78 degrees. im in Las Vegas...Help


Set System Switch to Cool and lower setpoint below room temperature.
Verify thermostat and system wires are securely attached.
Diagonistic: Set System Switch to Cool and lower the setpoint below the room temperature. Within a few seconds the thermostat should make a soft click sound. This sound usually indicates the thermostat is operating properly. If the thermostat does not click, try the reset operation ( . If the thermostat does not click after being reset contact your heating and cooling service person or place of purchase for a replacement. If the thermostat clicks, contact the AC manufacturer or a service person to verify the cooling system is operating correctly.
Or call the techline 18002842925.

Jul 18, 2010 | White Rodgers White-Rodgers 1F85RF-275...

1 Answer

Ac set at 74 room temp up to 78 and no Ac kicking on.


it could be the thermostat is loose on the subbase or if you went from OFF to COOL and the stat is a digital stat It will not come on for five min. This is a delay set by the manufacture to protect the compressor. during normal operation you will not notice because thier will be more than 5 min from the time it shuts of till it need to come back on but if the system switch is set to off and you switch to cool or unit just shut off it will always delay 5min. usualy there will be some insdiction on the screen that it is in delay like a flashing COOL or SNOW FLAKE or the word WAIT. the unit will not be running until the flashing words go solid

Jun 26, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

UNIT RUNS ALL DAY AND NIGHT WILL NOT COOL UNDER 78 DEGREES-ALSO WILL NOT EVEN HOLD AT 78 DEGREES. HAD THIS UNIT SERVICED OCT 29, 08. IT IS STILL UNDER WARRANTY-BUT WAS CHARGED 700.00. CAN'T AFFORD TO GO...


it sounds like thermostat which tell unit to turnoff
and set the temp. you can test them with hair dyer buy putting it on heat see what dose then cool. The display should show the temp. if so then it should shut off or turn on is. If not could be a bad thermostat. Or is the thermostat in a hot spot in the house is should be near the return. Hope this helps. Yes I do for living Paul


Jun 19, 2009 | Heating & Cooling

2 Answers

AC wont kick on....


The first thing to check is your breaker box. There should be one double breaker for the air handler unit, that's the inside unit, and one double breaker for the compressor, that's the outside unit. Check both breakers. If you're not sure if they've be thrown, click them toward the outside of the breaker box (off position) and then click them toward the inside of the breaker box (on position). If the breakers are on and you still are not getting any A/C take a look at your compressor, (outside unit). If the fan is running at least you're getting power. However, your compressor down inside the unit may not be getting power or it may need to be replaced. The compressor has a start-up cap. If this cap goes bad or the wires from this cap fry or corrode away, this will also keep the compressor from starting but the fan will still run. If the fan is not running it could be caused by a faulty relay inside the compressor cabinet. This relay is supposed to open and close based on a low voltage signal from the thermostat. I believe it's roughly 24 volts. This relay switches on and off the 240 volts for the compressor and the compressor fan. Often this relay goes bad or the wires leading up to it fry. If you?re going to work on the unit yourself make sure all power is shut off. There should be a shutoff switch on the outside wall near the compressor. I?d also shut the breakers off.

Jun 12, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

Programmable thermostat intermittent problems...


Some tstats control humidity as well. Temp will over shoot set point in order to reach humidity s

If you need further help, reach me via phone at https://www.6ya.com/expert/thomas_092728000e6acb79

Jun 24, 2017 | Honeywell Programmable Thermostat Heater

1 Answer

Inside fan runs constantly on my AC


Raise your thermosat to about 78. Also check to make sure the thermostat is set to auto and not on...

Jun 12, 2008 | Whirlwind FH-778 Air Conditioner

Not finding what you are looking for?
Heating & Cooling Logo

2,490 people viewed this question

Ask a Question

Usually answered in minutes!

Top Honeywell Heating & Cooling Experts

Bill Long

Level 3 Expert

588 Answers

Paul Carew

Level 3 Expert

3315 Answers

vance jones

Level 2 Expert

120 Answers

Are you a Honeywell Heating and Cooling Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...