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In this guide, we look at the meaning of various Bryant furnace light codes and how to troubleshoot each issue.
Bryant furnace light codes /Bryant furnace fault codes repair guide
Below are the most common Bryant furnace codes / Bryant furnace light codes and how to troubleshoot each (in no particular order):
Bryant furnace codes 14
This simply means your Furnace has experienced ignition Lockout.
Clean the igniter, flame sensor too..Also, double check all wiring
Next remedy is you may change hot surface igniter and see.
Bryant furnace code 11
Meaning: ignition failed.
Causes:
Primarily a bad ignitor
Worst case scenario: Control board damaged.
Solutions:
Change ignitor- Swap with this
To be sure it is the ignitor that isn’t working, it won’t activate or light up while the unit is running(check)
Quick note…do not touch igniter tip
Bryant furnace code 12
Means there’s a fan issue.
Here check if fan is blowing (listen) for a loud noise..if you can hear air blowing, then it could be a bad fan motor.
But if it is running (fan spins) but then it keeps tripping high limit switch, then you could be looking at a blocked intake vent as well.
Bryant furnace code 14
Meaning: Ignition lockout
What to do: Reset furnace(furnace won’t ignite properly hence it locked out and you must reset it)
How to reset Bryant furnace code 14:
Otherwise, again change igniter..perhaps it’s too old and worn out..Here is the recommended OEM replacement ignitor.
Bryant furnace code 13 fix
For Bryant furnace fault code 13, we previously made a detailed troubleshooting guide.
Read it: Bryant furnace code 13 – Quickest Fix
Well, you should not worry a lot if you are seeing Bryant furnace code 12 .. It most of the time indicates that you powered on your furnace when during a heat call.
So it’s more of an informational update than anything else.
But if the furnace shuts down (everything goes off) after seeing the error, then check the following:
The gas valve- verify it is switched on. Also confirm that the gas shut-offs are open.
And if you notice no gas valve movement/action and no flame, then there’s a possibility gas valve could be bad so you may need to replace it (Here’s recommended OEM part)
The other Bryant furnace code 12 fix is replacing the blower motor (not too common but sometimes it could be due to the blower quitting working)..
Finally, if the issue is persistent, it could be a bad board.
Recommended control board replacement
Bryant furnace codes 31 (Bryant gas furnace code 31)
Meaning:
High heat pressure-switch issue (it is stuck open)
What causes it?
Reason 1: Blockage in lines
What to do:
Blow into the tubes and check if pressure switch might close (blockage anywhere in the lines will prevent it from closing and it gets stuck open)
Reason 2: Clogged filters
What to do:
Vacuum the filters
Reason 3: Stuck inducer motor
What to do:
Manually spin the inducer motor (power should be off) then restart it and see…but if it is moving freely, then the culprit could be another part.
What can I try:
If cleaning the hoses and everything else hasn’t helped, clean the condensate trap…if frozen/ clogged it can be the trigger too…Take off then clean by simply running warm water through the trap.
WATCH (For steps on how to clean the trap)…
Diagnostic of Bryant code 31 Pressure fault code
Bryant furnace code 21
Meaning: Gas Heating Lockout
Causes:
- Bad flame sensor
- Gas valve issue
- Bad ignitor
Typically, the permanent solutions for any of the above is swapping out the parts with the following recommended parts:
- Recommended Bryant furnace flame sensor replacement part
- Recommended Bryant furnace Gas valve replacement part
- Recommended Bryant furnace ignitor replacement part
Bryant furnace code 13 limit switch
This we had already explained what it means and showed how to troubleshoot in this post:
Bryant furnace code 13 – Quickest Bryant furnace code 13 fix
Go through it if Bryant furnace code 13 is flashing.
Bryant furnace codes 33
Meaning: Limit circuit fault(high-limit switch /flame rollout switch open) so your furnace will be blowing cold air.
What you can try:
- Clean filter- a filthy filter often brings code 33!
- Disconnect the limit switch- then reconnect it…it sometimes works after reconnecting it(maybe it was loose)
- Press on the super tiny reset switch that is on limit switch(internal reset switch)…sometimes this resets the limit switch and the furnace starts to heat again.
- Clean the Furnace Flame Roll-out Switch next– Dust on the switch(es) depending on your model could be the issue. Note that on occasion the switch may be defective. Replace with this.
It is important you keep in mind that Bryant furnace code 33 is majorly related to airflow and ventilation problems so you may also want to try the following (if the above hasn’t helped)
- Step 1: Remove filter and check if furnace runs normally minus a filter… if it is, immediately add your filter back inside and proceed to step 2
- Step 2: Install a new air filter that is inexpensive… like this because the code could be due to a super advanced high-end filter installed into your furnace that’s not exactly made to work with your furnace.
- Step 3: If that has not worked, check internal circular fan as well as blades inside the blower motor compartment. Vacuum and clean if heavily dirty (furnace must be 100% off before cleaning). Reason? All the weight added to the interior fan blades lowers airflow inside system, causing the fault as well.
Useful Video
Bryant furnace code 34
If on lighting it the flames are not lighting off fast, try swapping the hot surface igniter. The part is dirt cheap.
But before that, it is a good idea to your furnace tested by a pro if you can’t for CO content- the logic here is to verify that secondary heat exchangers function fine.
In addition, a failing secondary heat exchanger can be a huge co hazard.
Do not forget that this is when you see the following behavior when you attempt to light the furnace: It shows Bryant furnace code 34 and wont light and sometimes it next gives you Bryant furnace code 14 (You must try the Bryant furnace code 14 fixes we explained earlier here).
Worth noting:
Code 34 can also be due to a defective gas valve, insufficient gas pressure, potentially faulty control board, aged or dirty flame sensor, or even a random electrical wiring issue.
PS: When it comes to all Bryant furnace light codes, always check furnace serial number as well as the model number when buying parts to be sure you’re getting the right part(they should match)
