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
Pressure switch failed to open or close (Vents blocked, Condensation circuit blocked, Draft motor not operate)
98% Efficiency furnace
Watchquard
Burners not ignite ( No gas, igniter broken) lost flame sense 5 times (clean flame sensor)
Medium Efficiency Furnace
Soft Lockout
No flame current sensed (No gas, igniter broken, low flame signal)
98% Efficiency furnace
Carrier error code
Pressure switch did not close or reopen
Defective inducer motor, defective pressure switch, Restricted vent
MEF
Blower on after power up
MEF
Limit circuit fault
Dirty filter, Defective blower motor or capacitor, Inadequate combustion air supply.
MEF
Ignition proving failure
Lost flame signal or no flame sensor signal. ( no gas pressure or no presence of flame at burners)
MEF
Recent Comments