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

    Jan 27, 2012, 11:32 AM
    Programmable thermostat not working in fan mode?
    Thermoat heat and A/C blower work OK on "Auto", but can't run "fan on", I.e. Can't run fan continuously. Maybe I'm not wording the question properly, but I can't find this question anywhere on the 'net. Seems odd. Have a Lennox gas furnce. The green wire is connect at both the thermostat and furnace.
    mygirlsdad77's Avatar
    mygirlsdad77 Posts: 5,713, Reputation: 339
    Plumbing Expert
    		  
    #2

    Jan 27, 2012, 04:07 PM
    You say the green wire is hooked at stat and furnace, but is it hooked to the G terminal on both?
    T-Top's Avatar
    T-Top Posts: 1,871, Reputation: 100
    Ultra Member
    		  
    #3

    Jan 27, 2012, 06:02 PM
    With some furnaces they will use 3 speeds on the blower-- high for cooling, medium for heating and low for continuous fan only. You will need to check for 24 volts at the furnace control board. With the thermostat set to fan on, you should have 24 volts on the G circuit. Check the voltage from C (common) to G. If you have voltage it's a board or blower wire that is bad.
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!

I have a programmable Rodgers-White thermostat that is not working [ 0 Answers ]

Model # could be 1F80-240 or 224. Cooling works fine, but no heat. Consulted R-W online info and tried overriding the program by selecting'heat,'pressing 'hold' 5 seconds, used up/down buttons to select temp. No luck. Also tried selecting a temporary hold time of 6 hours and then requesting a...

Programmable thermostat not working [ 2 Answers ]

The display screen on our Honeywell programmable thermostat is not on, and the heat won't come on. We can turn the fan on, so know it's not the breaker. We replaced the batteries, but it still doesn't work. Any ideas?

Programmable Thermostat - Fan won't run [ 1 Answers ]

We just installed a LuxPro Thermostat in our home but now the fan won't run. We always used to run the fan continuously with our old thermostat. With the new one the heat turns on when instructed but when it brings the house up to the correct temp. the whole things shuts off. We had the wiring...

Honeywell programmable thermostat not working [ 1 Answers ]

Honey programmable thermostat not working on "AUTO" position. Air conditioning will come on with "ON" switch, however, when on "AUTO" thermostat shows all functions in display but I can't adjust temp or change settings at all or get display to go away. The power did go out for a few minutes...

Programmable Thermostat Not Working in "AUTO" mode [ 1 Answers ]

Hi, just wondering if anyone can help me here. I have a Honeywell programmable thermostat that was installed by a professional about a year ago. About 3 days ago, the thermostat stopped maintaining a temperature and began dropping. The thermostat is showing HEAT on the display, however, no heat...

View more questions Search