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Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 5648
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: 21 days ago.
Category: HVAC
Expert:  BillyHvac replied 21 days ago.

Hello,

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

Customer: replied 21 days ago.
model 58stx090-10 serial 0203a42100
Expert:  BillyHvac replied 21 days ago.

Thank you,

Look at the pic HERE

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

Expert:  BillyHvac replied 21 days ago.

looks like this here