Ask Experts Questions for FREE Help !
Ask
    krw7771's Avatar
    krw7771 Posts: 1, Reputation: 1
    New Member
     
    #1

    Mar 8, 2008, 07:39 AM
    Long Running Heating Unit
    Why would my central heating unit run for one hour straight without cutting off if it has reached the programmed temperature?
    WallyHelps's Avatar
    WallyHelps Posts: 1,018, Reputation: 136
    Ultra Member
     
    #2

    Mar 8, 2008, 08:36 AM
    It shouldn't. A couple of causes:
    1. Thermostat shorted out (red-white wires)
    2. Thermostat "fan" switch is on
    3. Shorted wiring in the furnace itself


    If the temperature continues to rise, I'd suspect something like #1.
    If it runs, but is blowing cold air, I'd suspect something like #2.

    Hope this points you in the right direction.
    WallyH
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
     
    #3

    Mar 8, 2008, 09:29 AM
    Is this a new thermostat
    T-Top's Avatar
    T-Top Posts: 1,871, Reputation: 100
    Ultra Member
     
    #4

    Mar 8, 2008, 06:32 PM
    Do you have a heatpump and its real cold outside? Questions, questions we all have questions. If you can answer this one and the previous it will start to narrow it down and get you back on track.
    jandee's Avatar
    jandee Posts: 4, Reputation: 1
    New Member
     
    #5

    Mar 9, 2008, 02:25 PM
    We also have this issue with our heat pump. Our house is 2 years old with the original thermostat (as far as I know.) It has been colder than the heat pump likes, but still, if the thermostat is set at X, and the temp gets to X, shouldn't it turn off? The fan is on auto, so that shouldn't be it.

    My solution has been to switch to the electric heat at night, on our White-Rodgers thermostat it's called emergency heat. I know this isn't energy efficient, but otherwise, we're bugged all night hearing to the fan blow, which cannot be energy efficient either.
    I do wonder if I'm hurting the system by doing this.
    T-Top's Avatar
    T-Top Posts: 1,871, Reputation: 100
    Ultra Member
     
    #6

    Mar 9, 2008, 04:40 PM
    If your out side temps drop below 30 degrees your heat pump will run around the clock trying to keep up. If you loose 2 degrees on your set room temp the aux heat kicks in with the heat pump to keep you warm, when it starts to gain on room temp the aux heat drops out(system will run all the time with out catching up). Some times its better to switch to emergency heat at the thermostat to save money and cycle the equipment. I'm not saying nothing is wrong with your heat pump but they do run all the time with extreme temps.
    jandee's Avatar
    jandee Posts: 4, Reputation: 1
    New Member
     
    #7

    Mar 10, 2008, 05:00 AM
    Thanks, sounds like my instinct was right on not just wearing everything out by leaving the heat pump on when it's too cold.

    I'm still curious about the continuous running of the heat pump when the thermostat shows that the house is heated to the set temp, while the emergency heat will turn off when set temp is reached.

    Is this a common occurrence with heat pumps? If it's normal, fine, otherwise it seems the heat pump & thermostat aren't communicating properly. Would that maybe be a wiring issue?

    I hope to really understand all this someday, sure wish the previous owners had left the manuals.

Not your question? Ask your question View similar questions

 

Question Tools Search this Question
Search this Question:

Advanced Search

Add your answer here.


Check out some similar questions!

Air/heating unit outside running but not blowing air into home [ 1 Answers ]

Was wondering if anyone would know, my main unit outside, will turn on,fans on it are running, but its not cooling house, no air coming threw vents in house, if we leave air/heating unit running outside ,it starts to sweat,theirs water on top of the unit, not sure if its freezing up or not ,it was...

Carrier heating unit --fan won't work with heating [ 6 Answers ]

I have a carrier heating unit installed in 2000... it worked fine since then but now... fan will work if we turn it ON by itself... but if we turn on auto heat then heater goes on (blower like sound) but fan doesn't force the air into the house... if we turn off the heat... fan comes on...

Size of ac unit needed to match a carrrier heating unit [ 3 Answers ]

I had a Carrier natural gas heating unit installed in 2003. Model number 58STA/STX 070 Catalog number 535-80105. My ac unit has gone out and the company I bought the heating unit from has gone out of business. What size ac unit will match the heating unit? Thanks so much!:cool:

AC/Heating unit stopped running - No power [ 4 Answers ]

My Janitrol AC Heating unit stopped running suddenly. I can neither use the Cool nor Heat (if I switch to either on the thurmostat I hear nothing). The fan doesn't run either when switched to ON. I checked the cirtcuit braker for the AC/Heating using and it was in the ON position, but when I try...


View more questions Search