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TROUBLESHOOTING CHART ( FOR QUALIFIED SERVICE TECHNICIAN ) - BLOCKED FLUE SWITCH
POSSIBLE CAUSES
Blockage in
Vent Pipe
Burner is
Overfiring
Improper Vent System
A. Vent too short
B. Restriction in vent system
caused by offsets
C. Incorrect vent pipe
Incorrect Header Plate Location
Vent Pipe not Down on
the Header Plate Securely
Loose Connections on the
Vent Safety Wiring Harness
To do so could expose the consumer to property damage, personal injury or possible death.
Please follow the following corrective actions in order.
A. Check vent pipe for blockage, such as bird nest, wasp nest, twigs, leaves, etc.
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. Check that no insulation from the header plate got caught on top of the draft diverter when the heater was inserted
into the wall.
D. Check that the vent cap is properly installed, not shoved too far down on the vent pipe.
A. Check the manifold pressure.
B. Check the rate. NOTE: The appliance is orificed at the factory for elevations between sea level and 2,000
feet. If installed above 2,000 feet, refer to orifice chart (on page 5) in controls section of instructions for
proper orifice size and re-orifice accordingly.
Correct vent system.
A. The vent should terminate a minimum of 12 feet above the floor. See Figure 7-E (on page 11).
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-A (on page 7).
B. All type "B" vents shall extend in a generally vertical direction with offsets not exceeding 45 degrees, except
that a vent system having not more than one 60 degree offset may be allowed.
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.
Any offsets used should be as far above the drafthood as possible to allow a venting action to begin before
any restriction is encountered.
C. Use listed BW type vent pipe. Do not use tansite or any other type of ceramic pipe for venting. Do not use
single wall pipe. When venting into a masonry chimney the chimney must be properly lined and sized for
this gas furnace. The use of type B or flexible chimney liner is recommended.
The header plate must be 65-3/4" above the floor plate. See rough-in instructions (Fig 7-A on page 10).
Use a base plate (obtained from the vent pipe manufacturer) on top of our header plate. This will lock the vent
pipe down and prevent the draft diverter from shoving it up.
Check the connection on both the switch and the gas valve. Tighten if necessary.
DO NOT BYPASS THE BLOCKED FLUE SWITCH
Page 23
CORRECTIVE ACTION
1017754-A
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