Lennox furnace Alert code 294: Inducer motor overcurrent — Watchguard
Alert 294 means the furnace inducer motor is drawing more current than it should. The system goes into Watchguard mode and clears itself once the current reads normal again.
Applies to: Lennox communicating gas furnaces on systems using the S30, S40 or comparable communicating thermostats, as documented in the Lennox Residential Communicating Systems Alert Code Guide.
What it means
The inducer pulls combustion air through the burners and pushes flue gas out of the vent. A motor drawing excess current is a motor working harder than it was designed to, and on an inducer that usually means mechanical drag rather than an electrical fault — worn bearings, or a wheel fighting a restriction. Lennox's troubleshooting reflects that, naming bearings, wiring and amps together. What makes this alert worth having is that it catches a failing inducer before it fails outright. An inducer that seizes in January is a furnace that will not run at all; one reporting overcurrent is still working and is telling you it will not be for long.
Most common causes
- Worn or failing inducer motor bearings.
- A restriction in the vent or intake making the inducer work against more resistance than designed.
- Debris in the inducer housing or on the wheel.
- Damaged or degraded wiring to the inducer raising the current draw.
- A motor at the end of its service life.
How to diagnose it
- Note whether the inducer has become noisy, since bearing wear is usually audible before it is measurable.
- Check the vent and intake terminations outside for blockage, which is the one item here that is homeowner work.
- Note whether the alert clears on its own and comes back, which is the pattern of a motor that is failing rather than failed.
- Leave current measurement to a technician.
How to fix it
- Clear any blockage at the vent or intake termination.
- Everything else is technician work: Lennox specifies checking combustion blower bearings, wiring and amps.
- Expect the inducer to be replaced if it does not meet performance standards. Lennox does not offer a repair path for the motor itself.
- Treat a recurring version of this alert as a scheduled replacement rather than waiting for the failure.
Notes
The alert clears automatically once inducer current is sensed to be in range after an ignition, either following Watchguard or a unit reset. That self-clearing means a furnace can run all season with an intermittent 294 in its history, which is exactly the case worth acting on before winter.
Related
All codes for this manufacturer
Lennox furnace alert codes — every code, with what differs between models.
What the fix costs
An inducer replacement runs $300–900 in the repair cost guide, with brand parts availability driving that wide spread — and this alert's early-warning nature is worth actual dollars against both ends of it. A furnace still heating lets you schedule at normal rates rather than paying the guide's $100–200 emergency premium for the January morning the motor finally seizes, and it leaves time to source the specific inducer assembly rather than paying whatever can be couriered fastest. The cheaper endings exist too: overcurrent from a wheel dragging against debris or a restriction clears with cleaning, and a wiring fault mimicking mechanical load is a repair, not a motor. The diagnostic that sorts them — amp draw against specification, by hand on the wheel with power off — is standard technician fare at $75–150, credited if you proceed.
DIY or call a pro
The inducer sits between the burner box and the flue, and everything diagnostic about this alert — spinning the wheel to feel bearing roughness, reading amps under load — happens there, so the hands-on work is professional. The homeowner instrument for a failing inducer is hearing: a whine or grind from the small motor near the flue pipe during the pre-ignition and run periods, especially one that has been getting louder across weeks, corroborates the overcurrent story and is worth reporting with dates. The self-clearing behavior is the trap to respect — this alert wipes itself once current reads normal, so a fault history showing repeated 294s is a motor cycling in and out of distress, not a false alarm that keeps clearing. Book the visit while it is still a warning; the same motor as a no-heat emergency costs more and waits longer for parts.
What this looks like
From the outside, this usually shows up as the inducer spins up but the burners never fire — that walkthrough covers what to check in order, and when it stops being a homeowner job.
This can also show up as a new or worsening noise from the furnace — that page matches the sound to the likely cause.