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

    Jul 15, 2010, 07:21 PM
    Continuously running fan on "Auto" on thermostat
    The fan on the thermostat continuously runs, even if it's set on "auto". I have to shut off the main switch in order for it to shut off. But once the air kicks on, the fan stays on until I flip the main switch again. Also, the error code on the main board reads Reversed 115 VAC polarity... any ideas?
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Jul 16, 2010, 04:03 AM
    Quote Originally Posted by ashtonjns View Post
    The fan on the thermostat continuously runs, even if it's set on "auto". I have to shut off the main switch in order for it to shut off. but once the air kicks on, the fan stays on until i flip the main switch again. also, the error code on the main board reads Reversed 115 VAC polarity... any ideas?
    The reverse polarity usually means that the line and neutral are reversed or it is possible just the transformer feed wires are reversed. Sometime these type of problems can be very difficult to find.
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!

Fan Blower not working in "ON" or "AUTO" in heat or AC [ 13 Answers ]

Got home from the Brewer game this afternoon and noticed the house was warm(78). Outside was 91. I checked the T-stat and it was set correct. Noticed the air vents weren't blowing anything. Went outside and the condenser and fan was running fine. Then I went downstairs to the furnace unit to see...

A/C or Heat does not work w/thermostat set "on" or "auto". [ 22 Answers ]

A/C or Heat doesn't work in "on" or "auto". Fan will not come on at the "on" position either. I changed the batteries in the thermostat. I also read somewhere to disconnect the "Y" and hold it to the "R" on the thermostat for two minutes. That will tell me if the thermostat is the problem. ...

AC blower fan will not run in auto, only "ON". (heater runs in auto fine). [ 2 Answers ]

AC problem. My blower fan will not run in auto. (heater runs in auto fine). The fan will run in "on" position. I suspect the timer (or maybe a limit switch if there is one) on the fan control board. Does anyone know where I can get a schematic for the Lennox BCC2 fan control board? Thanks...

Should I have the fan switch turned to "ON" or "AUTO"? [ 6 Answers ]

Should I have the fan switch turned to "ON" or "AUTO"?

View more questions Search