Carrier 58TUA User's Information Manual page 8

NOTE: If dirt, rust, soot, or scale accumulations are found, call
your servicing dealer. DO NOT OPERATE THE FURNACE.
WARNING
!
If holes are found or if the vent pipe is obstructed
or is not connected, toxic fumes can escape into
your home. DO NOT OPERATE YOUR FURNACE.
Call your dealer for service. A failure to follow this
warning could result in personal injury or death.
3. Inspect the vent pipe for a sag, holes, or a disconnection.
A horizontal vent pipe must slope upward. If rusty joints
or seams, or signs of water leakages are found,
call your dealer for service.
4. Replace the access doors and restore electrical supply
to the furnace. Be sure bottom door flange is inside of
the furnace casing. (See Fig. 16 and 17.)
5. Start the furnace and observe its operation. If possible,
watch the burner flames. Are they burning bright blue?
If not or if you suspect some other malfunction, call
your servicing dealer.
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