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The following is a list of possible causes and corrective actions for blocked flue switch problems.
TROUBLESHOOTING CHART ( FOR QUALIFIED SERVICE TECHNICIAN )
BLOCKED FLUE SWITCH PROBLEMS
POSSIBLE CAUSES CORRECTIVE ACTION
1. Blockage In Vent Pipe 1. A.
B. Check inside the bottom of the vent pipe to make sure the top of the draft diverter did not rip the inner
liner causing it to block part of the vent opening.
C.
D.
2. Burner Is Overring
2. A. Check the manifold pressure.
B. Check the rate
NOTE: This appliance was oriced for elevations up to 2,000 feet. When installed at higher elevations
refer to orice chart in “Controls” section of instructions for proper orice size.
3. Improper vent system.
A. Vent too short
B.
C. Incorrect vent pipe
3. Correct vent system.
A. Also, the top
of the vent must be at least 2 foot above any obstacle within a 10 foot radius, including the roof. See
Figure 1 on Page 5.
B.
Any angle greater than 45 degrees from the vertical is considered horizontal. The total horizontal
run of a vent plus the horizontal vent connector shall be not greater than 75 percent of the vertical
height of the vent.
C. Use listed BW type vent pipe. Do not use transite or any other type of ceramic pipe for venting. Do not
sized for this gas furnace. The use of type B or a exible chimney liner is recommended.
4. Incorrect header plate location 4. Consult Figure 10 (on page 10) for correct header plate height.
5. Vent pipe not down on the
header plate securely
6. Loose connections on the
safety wiring harness
WARNING: Do not bypass the blocked ue switch. To do so could expose the consumer to property
damage, personal injury or possible death.
!
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