What to do if I have a code 31Post created: 2013-01-23 Type of Equipment: Furnace Views: 1098
This question was created on the page: https://www.furnacecompare.com/furnaces/carrier/weathermaker-9200.html.
On 2013-01-23 JB wrote:
I've pasted a previous answer below. Though this post was for a Carrier 58MCB the information should pertain to a Weathermaker 9200 as well.
However for a link to a good troubleshooting thread you can go here: http://www.doityourself.com/forum/gas-oil-home-heating-furnaces/445461-carrier-weathermaker-9200-error-code-31-a.html.
For the owner's manual, which explains the error codes and offers suggestions (though I recommend bringing in a certified HVAC tech if you are unfamiliar with working on a furnace as it can be very dangerous) you can go here: http://www.docs.hvacpartners.com/idc/groups/public/documents/techlit/om58-67.pdf
Here is my previous post:
"You should be able to find a list of the diagnostic codes on the inside cover of the furnace, but you can go here for a full list of the codes: http://www.manualslib.com/manual/25568/Carrier-Carrier-58mcb.html?page=15.
An error code 31 refers to a malfunction related to the pressure switch, which is a safety device to ensure proper flow of either air or water through the furnace (depending on the type of heating medium). If the pressure is incorrect the switch cuts power to the entire furnace thereby preventing risk of fire and/or extreme damage to the furnace.
You can learn a lot more here: http://www.ehow.com/how-does_5020065_furnace-pressure-switch-work.html.
Included with the list of error codes are instructions for what to check on the furnace to determine the cause of the problem. However, I really recommend that if you are inexperienced that you bring in a certified HVAC tech to diagnose and fix the problem since this is an important safety device and may be dangerous to work on."
To keep legal happy, let me just say that I am not an HVAC contractor, and you should never even look at your furnace without having a qualified, liability accepting HVAC contractor present. To keep sales happy, let me just say that you can find an HVAC contractor that's happy to take your money here: http://www.furnacecompare.com/perl/find_contractors.pl.