Lennox ML196UH030XE36B, Информация об устройстве

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Page 18
TABLE 8
Problem Corrective Action
Pressure switch stuck closed
Check that the pressure switch is open without the com -
bustion air inducer operating. Replace if defective.
Pressure switch does not close due to obstruction in vent
pipe.
Check for restricted vent. Remove all blockage. Check for
proper vent sizing. See table 13.
Pressure switch does not close due to incorrect routing of
the pressure switch tubing.
Check that the pressure switch tubing is correctly routed.
Correctly route pressure witch line.
Pressure switch does not close due to obstructions in the
pressure switch line.
Remove any obstructions from the the pressure switch
line and/or taps
Pressure switch tubing damaged.
Check pressure switch tubing for leaks. Replace damaged
tubing if necessary.
Condensate in pressure switch tubing.
Check pressure switch tubing for condensate. Remove
condensate from tubing.
Pressure switch does not close due to a low differential
pressure across the pressure switch.
Check the differential pressure across the pressure
switch. Check for restricted inlet vent. Remove all block -
age. Check for proper vent sizing and run length. See
table 13.
Wrong pressure switch installed in the unit, or pressure
switch is out of calibration
Check that the correct pressure switch is installed in the
unit. Replace pressure switch if necessary.
Miswiring of furnace or improper connections at pressure
switch.
Check for correct wiring and loose connections. Correct
wiring and/or replace any loose connections.
Pressure switch failure.
If all the above modes of failure have been checked, the
pressure switch may have failed. Replace pressure switch
and determine if unit will operate.
Damaged condensate trap.
Check trap for any cracks or damage and replace if nec -
essary.
Cold end header box does not drain properly.
Check that the furnace is set properly with a slight tilt (0
- 1/2”) towards the front if necessary. See furnace installa -
tion instruction.
Air leakage around the combustion air inducer gasket. Check gasket and replace if necessary.
Air leakage around the cold end header box gasket. Check gasket and replace if necessary.
Damaged cold end header box tubing. Check tubing and replace if necessary.