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I have a york hvac system that is 5 years old. I have the thermostat set at 74 and when it turns on only the fan runs circulating the existing air in the house about 20 percent of the time. The a\c works great when it is running but i'm wondering why it doesn't always come on. Just replaced the thermostat thinking that was the problem but it did not help. Sometimes after the fan runs for a half hour or so the a\c will finally kick in and start blowing cold air. The lines are not frozen at any time during this time. The outside fan has always run during this time also. Is there something wrong with the compressor? Any advise would be great

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It sounds to me like you have a delay on start timer on the compressor that possibly is starting to fail or someone may have adjusted the time band up on it. I myself would remove it and install a delay on break timer and a 5 minute setting would be ample time.

Hope this helps Ya

Posted on Jul 13, 2008

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Posted on Jan 02, 2017

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I have a Dometic 15K roof Ac on my FW. After the AC reaches therm temp, the compressor and the fan turn off, but the fan starts right back up again and runs until you set the thermostat on off.


That is normal operation, only the compressor cycles, the fan stays running to keep air circulating for better temp control. Otherwise the rear of the space could get 5 degrees warmer than the front

Feb 23, 2015 | Dometic 459516 459516.XX1C0 Brisk Air...

Tip

Honeywell TH8320U Thermostat


The Honeywell Vision Pro 8000 Digital Thermostat is a fully programmable thermostat that is so easy to use that you might think that it is reading your mind as you work with it.

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This intuitive logic responds to you as you program this thermostat and helps you to do what you wan to do. The instruction manual almost becomes a thing of the past. This thermostat also will learn your building and HVAC system. It then adjusts to keep your temperature within 1 degree F of the set point. This will give you the best in comfort. The comfort is achieved while still giving you the very best is efficiency. In some cases efficiency has been increased by up to 30% by simply installing this thermostat.

The fan can be programmed separately for increased comfort when running an electronic air cleaner or a humidifier. A 35% circulator mode is also available. Hold options will let you easily go on vacation or temporarily override the programmed settings. The vacation setting will even let you set it to go back to the schedule before you get home. There are also built in reminders for many of the things that need scheduled maintenance.

If you are thinking about or have a dual fuel set up or a heat pump furnace set up, then this is the thermostat for you. With the addition of an outdoor sensor you can set the thermostat to switch from one heat source to the other at whatever temperature you set.
This feature will eliminate the need for “change over kits” extra relays, etc… when you are setting up a system that has a backup heat source.

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This thermostat will also allow you to run it from the power of your HVAC system or run it on battery power. Just hook up the common wire and the thermostat will run off of your HVAC system. The changeover of the unit from A/C to heat can be programmed to be either manual or automatic. Scheduling of the program can be done in many different ways. You can decide between 1 day, 7 day, 5+2, or 5+1+1, day. Four periods, 2 periods per day or nonprogrammable are all options also.

The keyboard can be locked completely or partially. With the purchase of additional sensors you can wire up remote indoor sensors. These can also be wired to average the temperature is you want to sample the temperature from more than one place. An outdoor sensor can be installed so that you can see from your thermostat the outdoor temperature.

A five year manufacturers warranty is standard and you will also get a thermostat that has earned the energy star rating.

http://www.fixya.com/support/r3869033-replacing_thermostat


http://www.fixya.com/support/r3623083-thermostat_wiring_terminal_designations

http://www.fixya.com/support/r3894275-manual_honeywell_find_honeywell_manuals

on Jan 18, 2010 | Heating & Cooling

1 Answer

Set thermostat at 74 heat pump will not cycle it will cycle at 75 degrees ?


check stat calibration. see if you can measure temperture at stat. the thermostat cover temperture reading is not that accurate.

Jun 01, 2014 | Goodman CLQ36AR49 Air Conditioner

1 Answer

The fan on one my central heating and air unit won't come on? It was working fine when I went to bed at 1:30 in the morning and when I got up around 7:30 this morning it wasn't running anymore.My house has...


Running the equipment on 72 degrees would cause the compressor and fan to work harder on hot days. This will definitely place more strain on your capacitor. These capacitor problems usually happen on the hottest days. I would suspect the capacitor, not the fan. I'm an HVAC tech, so I would Check both with my multimeter

Aug 25, 2013 | Heating & Cooling

1 Answer

York Air Conditioner unit doesn't turn on


jumper red to yellow on thermostat if it kicks on problem is in the thermostat.

Apr 22, 2012 | Heating & Cooling

1 Answer

I have a new Carrier HVAC system with a fancy EDGE thermostat. When I turn the system OFF at the thermostat, and set the fan to AUTO, hours later I will find that the fan is running and it's setting on the...


1. Open the door. 2. Press and hold the buttons underneath the heat and cool setpoints simultaneously (the two bottom buttons on the right) until the screen displays the reset reminders and 01 in the lower right corner. 3. Press the up arrow button until 01 changes to 07 with OF (fan mode) next to it. 4. To turn the fan on, press the rightmost lower button then press the up arrow button until the screen displays ON. To turn the fan off, press the rightmost lower button then press the down arrow button until the screen displays OF (off). 5. Press the done button. 6. Close the door.

Jun 06, 2010 | Carrier 36KCARMS Air Conditioner

1 Answer

No cool air coming out of home air conditioner


Unless your compressor is burnt up, you probably don't need a new unit. If it's a 1998 it's not that old and you can get parts, the only thing is it's probably R-22 refrigerant and they must fix the leak in the unit if that's the problem before adding refrigerant and the refrigerant is expensive.. All they have in a heating and cooling system, that needs replaced, are a few parts. Outdoor unit has a fan motor,compressor, capacitors fan and compressor and a contactor. Furnace has a blower motor, capacitor, gas valve, fan and limit or furnace control board, which they still make replacement parts for.
My advice would be to call some more HVAC companies, till you find one, that is willing to fix your unit and not replace it..

May 31, 2010 | Whirlwind FH-778 Air Conditioner

1 Answer

Have a 3 year old york central air system, used very little. Turned on --- compressor runs, but fan to cool compressor will not run. What is it? I doubt the fan motor is bad?


Most of the time if the compressor runs but not the fan, it is one of two things either burned/broken wires causing bad connection or bad capacitor. Simply replace capacitor with a capacitor with the EXACT same specifications and you are good to go.

Jun 27, 2009 | Heating & Cooling

1 Answer

I recently bought a 4 ton 14.5 SEER Rudd Spilt system using R-410 and matching Rudd furnace. This system replaced a Lennox 10 SEER 4 ton unit. Now that it has gotten hot in Baton Rouge LA 90-93 degrees....


Sounds like the Unit might be low on charge.But without correct readings not sure.
The new unit with 410 will actually cool better due to higher boiling point temp. of freon type.Poor air circulation could also cause problem.Such as dirty filter, too slow fan speed,dirty coil.Also could have obstruction in freon lines either at pump,in line set,or in coil.
Get someone u trust to check it out and ask for their Rudd Dealership Training Credentials.

Jun 15, 2009 | Heating & Cooling

1 Answer

HVAC issues - A/C blows semi-cold air and Heater won't turn on


hi! there,
there are possible cause in the circuit is the thermostat,since thermostat switch is like a switch of light,when this turn on blower and compressor turn on,if you turn on and no cold your thermostat
is defective.replace thermostat,if run but insufficient cold was feel check the operating current,there is a rated current you can compare it can tell if your freon charged is under charged,this should be done by certified service technician from your service center,have inform from your manual the telephone no. and location have it call.if still under warranty claim it have a nice day.

May 15, 2009 | Heating & Cooling

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