Equipment error code

Lennox code E292

E292 — line voltage low. The control measured supply voltage below the minimum allowable threshold for safe furnace operation.

Equipment: furnace
Brand: Lennox
Source checked: 2026-03-01

What this code means

E292 — line voltage low. The control measured supply voltage below the minimum allowable threshold for safe furnace operation.

Source: Lennox EL296V Installation Instructions — Fault Code Table (EHB-EL296V-01) · checked 2026-03-01

Which models show it

Lennox communicating and standard furnaces with integrated controls — SLP98V, EL296V, SL280V, ML193, and CBK communicating kits.

What is actually happening

Furnace may not start, may drop out during blower or ignition, or display E292 while other appliances dim. Protects board and motors from brownout damage.

Is it safe to keep running?

Do not force heat during voltage dips — motors and controls can fail permanently on low voltage.

Shut it down when

Lights flicker with every furnace start, burning smell at electrical panel, or breaker feels hot.

What a homeowner can safely check

Check whether other large loads (dryer, oven) run at the same time — note patterns for the tech.
Verify the furnace disconnect is fully on and breaker not tripped halfway.
Look for extension cords or shared circuits — furnaces need dedicated breakers.
If whole-house lights dim, involve an electrician — not only HVAC.

When to stop

Burning smell from panel or furnace junction box.
Repeated E292 during mild weather with little other load.
You are not comfortable checking breakers safely.

Likely causes ranked

1. Loose furnace disconnect or junction connection
How a tech confirms: Voltage drop test under blower load; tightens lugs.
Typical repair: $150–$325 · Air Conditioner Repair cost guide
2. Undersized or failing supply circuit
How a tech confirms: Electrician measures voltage at panel under load; upsizes wire or breaker if needed.
Typical repair: $250–$850 · Furnace Replacement cost guide
3. Failing blower ECM drawing excess amps
How a tech confirms: HVAC tech isolates motor amp draw; replaces ECM module.
Typical repair: $450–$1,100 · Furnace Replacement cost guide
4. Utility brownout or transformer issue
How a tech confirms: Utility voltage log; whole-home surge or regulator evaluation.
Typical repair: $0–$400 · Air Conditioner Repair cost guide

Is this the end of this unit?

If low voltage damaged the integrated control, replacement control plus motor can exceed $1,500 on older Lennox units — compare to new furnace pricing.

How to clear the code

Resolve voltage issue first, then power cycle once. E292 should not be cleared by repeatedly resetting while supply is still low.

Why clearing is not fixing it: The code appears when measured voltage is low. Resetting without fixing supply or connections brings E292 back under load.

Which trade to call

Call a licensed hvac contractor who works on furnace equipment. Gas, refrigerant, and combustion faults are not general handyman jobs.

More codes from this brand

Symptom guide: Furnace Blower Won't Stop Running

FAQ

What is Lennox error E292?

Low line voltage — the furnace measured supply below the minimum allowed for operation.

Electrician or HVAC for E292?

Start HVAC if connections at the furnace are suspect; call an electrician for panel, breaker, or whole-home dimming issues.

Can a bad capacitor cause E292?

A failing motor can drag voltage down locally, but E292 is a supply measurement — techs test at the board under load.

Typical E292 repair cost?

$150–$325 for loose connections; $250–$1,100 for circuit or ECM work; utility issues vary.

Is E292 dangerous?

Low voltage can overheat motors and wiring. Do not ignore flickering lights with heat calls.

Source

Source — Lennox EL296V Installation Instructions — Fault Code Table (EHB-EL296V-01). Checked 2026-03-01.