Lennox · Furnace error code

E294Inducer overcurrent

Single source High-voltage / caution

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Related diagnostic guides

Component test · Furnace

How to test a gas furnace draft pressure switch (electrical and draft checks only)

The pressure switch proves the inducer is pulling enough draft before ignition is allowed. Test it with a meter (24 V across it) and a manometer against the set point printed on the switch. Gas valve, gas pressure and burner work are not covered: refer those to a licensed gas technician.

5 steps ~30 minadvanced

Guide · Furnace

Pressure switch open / inducer problems

The pressure switch proves the inducer is moving combustion gases. It stays open when the vent/intake is blocked, the hose or port is plugged, the condensate trap backs up, or the inducer is weak.

5 steps ~45 minmoderate

Guide · Furnace

Noisy furnace (squeal, rattle, roar, boom)

Mechanical noises (squeal, grind, rattle) usually come from the blower or inducer and can be checked with power off. A loud boom at ignition or roaring flame is a gas/combustion problem that must be referred.

4 steps ~45 minmoderate