Isn’t it time to know what you don’t know?

Click here to check out our structured, online appliance repair training courses for rookies and experienced techs.

FAQs | Repair Videos | Academy | Newsletter | Podcast | Contact

Stay connected with us...

Samurai on Facebook - become a fan today! Sign up for our free newsletter and keep up with all things Appliantology. Subscribe to our YouTube channel for lots of appliance repair tips and help! Follow the Samurai on Twitter and get timely morsels of Appliantological Wisdom! Subscribe to our MST Radio podcast to learn secrets of the trade.
dgp

Carrier Weathermaker 9200 Code 31 Pressure Switch

5 posts in this topic

I have a Carrier Weathermaker model 9200 which is throwing an error code 31 for the pressure switch.  After researching a bit online I found that one of the drain lines could be clogged.  I pulled all three lines and they were fine, they didn't have any backed up water and I could blow through them.  I then checked the fan motor which appears to be spinning fine when the system in on.  It spins freely by hand when the system is off.  

 

Up in the furnace window I never see the glow of the starter.  It apparently never gets to that point in the startup.

 

Any thoughts?

 

Don 

Share this post


Link to post
Share on other sites

Need appliance parts? Call 877-803-7957 now!

Could be you have a bad pressure switch?

Can you ohm it out to see if it makes?

Share this post


Link to post
Share on other sites

I disonnected the pressure switch leads and connected the ohmmeter leads.  I set the instrument to Ohms at 200 with a reading of "0L" when the system is off.  After turning the system on the motor began to spin and the ohmmeter spiked then settled on .2.  Am I testing the switch properly?  If so, the low reading means I need a new switch?

 

Thanks,

Don

Share this post


Link to post
Share on other sites

Additionally, I checked the upstairs unit which is functioning correctly.  The pressure switch measured "0L" when off, then the ohms went to 20 (setting 200) back to 0L then up to 30.   It sounds like my pressure switch is bad.

 

Don

Share this post


Link to post
Share on other sites

Junk in the intake pipe. Junk in the exhaust pipe. (Leaves, animals, wasp nests, etc). Bad pressure switch. Cracked pressure switch tubing. Loose wiring connections to switch.

A lot of the time clogged traps or drain tubes will cause water to back up into the inducer fan and make a water wheel out of it. You can usually hear the gurgle.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now