Ask Experts Questions for FREE Help !
Ask
    coldnblue's Avatar
    coldnblue Posts: 5, Reputation: 1
    New Member
    		  
    #1

    Feb 23, 2008, 06:44 PM
    A code 31 on I believe a Day and Night 80 plus forced unit
    I am on propane which was down to 30% yesterday but is full today. My problem is my heat will not come on, the fan works in the on position. The LED flashes a 31 . I have replaced the thermastate and checked the breakers and fuze and they are OK. I just don't know where to go from here. I am hoping for some quick advise. Thank You.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Feb 23, 2008, 08:30 PM
    Read all this link.

    https://www.askmehelpdesk.com/heatin...=carrier+codes
    T-Top's Avatar
    T-Top Posts: 1,871, Reputation: 100
    Ultra Member
    		  
    #3

    Feb 23, 2008, 09:41 PM
    Make sure you have LP in your tank. Code 31 is pressure switch did not open or close. With LP you should have an extra pressure switch in the system to cut out if the gas pressure it to low.
    coldnblue's Avatar
    coldnblue Posts: 5, Reputation: 1
    New Member
    		  
    #4

    Feb 23, 2008, 09:48 PM
    Now that I have a full propane tank, I was hoping that would have fixed the problem. I was wrong. Is there something I can do to reset or ? I still don't have heat.
    T-Top's Avatar
    T-Top Posts: 1,871, Reputation: 100
    Ultra Member
    		  
    #5

    Feb 23, 2008, 10:05 PM
    Turn the power off going to the furnace for a few seconds to reset the control board turn it back on and give it a try.(main power going to furnace 120v)
    coldnblue's Avatar
    coldnblue Posts: 5, Reputation: 1
    New Member
    		  
    #6

    Feb 24, 2008, 11:23 AM
    I did turn off the power, nothing happened. I also cleaned the return vent filters and put them back in. they were not that bad. Anything else I can try before calling in the expertz?
    T-Top's Avatar
    T-Top Posts: 1,871, Reputation: 100
    Ultra Member
    		  
    #7

    Feb 24, 2008, 05:37 PM
    You can remove the pressure switch and blow and suck lightly on the rubber hose going to it to see if its stuck. You should hear a click from the micro switch when doing this. Put it back together and give it a try. If it gives you code 31 again after the previous test you may have a bad control board.(TURN POWER OFF FIRST)
    coldnblue's Avatar
    coldnblue Posts: 5, Reputation: 1
    New Member
    		  
    #8

    Feb 24, 2008, 07:57 PM
    How do I identify this pressure switch (locate) so I can blow and suck through it?
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!

Self test OK, but no heat from day&night forced air furnace [ 8 Answers ]

So this morning I cleaned the filters and turned power off to the furnace. Now power is back on, self test passes (inducer, igniter, humidifier relay (no humidifier hooked up), blower high, blower low), but when I put it back in operation heat does not come on - just th 'inducer.' the igniter...

Day and night central unit =No Heat [ 5 Answers ]

Fan comes on NO HEAT changed the Mercury switch still not heating. Pilot is on What to do now?

Day and Night Unit [ 1 Answers ]

What is the tonnage on a 30DNR-106AC this is a 35 year old unit

Day & Night Unit on the BLINK [ 4 Answers ]

I changed my filter in my central heating system and when I replaced the front the fan motor started to run. The thermostat was in the off position. I removed the front cover and replaced it again and the fan continued to run. The pilot light would not come on. It is a week later and we tried all...

Day & Night forced air heater keeps blowing cold air [ 1 Answers ]

Yesterday my heater was working as normal. Today I replaced the filter in my Day & Night forced air heater. Later I bumped my thermostat when walking by it, but I'm not certain that this caused the problem. My heater turned on and blew hot air. I turned it all the way down, but the fan...

View more questions Search