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Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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Heating unit keeps flashing code 33, have checked both, yes

Customer Question

heating unit keeps flashing code 33
JA: Did you double-check the thermostat's settings? And what about the filters?
Customer: have checked both
JA: Do you plan on doing the work yourself?
Customer: yes unit has ls 1&2 fse and stack scencer all are good
JA: Anything else we should know to help you best?
Customer: vents are aqll open stack is noy pluged runs and shuts down on code #33 then comes back on
Submitted: 5 months ago.
Category: HVAC
Expert:  BillyHvac replied 5 months ago.


do you have the model number or a pic of furnace with door off?

Customer: replied 5 months ago.
model 58stx090-10 serial 0203a42100
Expert:  BillyHvac replied 5 months ago.

Thank you,

Look at the pic HERE

The one limit is mounted on the back wall behind the gas you see this on your furnace?

Expert:  BillyHvac replied 5 months ago.

looks like this here