Lennox
Furnace error code, most common
Primary/secondary limit switch open
System Overheat, Check your filter ,Test the blower motor operation mode (Fan On)
Medium Efficiency Furnace
Low/High pressure switch
E223,E 224, E225, E226
Pressure switch failed to open or close (Vents blocked, Condensation circuit blocked, Draft motor not operate)
98% Efficiency furnace
Watchquard
LED 1 Alternating Slow-Flashing, LED 2 Alternating Slow-Flashing
Burners not ignite ( No gas, igniter broken) lost flame sense 5 times (clean flame sensor)
Medium Efficiency Furnace
Soft Lockout
E270
No flame current sensed (No gas, igniter broken, low flame signal)
98% Efficiency furnace
Carrier error code
Pressure switch did not close or reopen
LED code 31
Defective inducer motor, defective pressure switch, Restricted vent
MEF
Blower on after power up
Blower runs for 90 sec if unit is powered up during a call for heat
MEF
Limit circuit fault
LED code 33
Dirty filter, Defective blower motor or capacitor, Inadequate combustion air supply.
MEF
Ignition proving failure
LED code 34
Lost flame signal or no flame sensor signal. ( no gas pressure or no presence of flame at burners)
MEF
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