Lennox Furnace Repair Nationwide | Dalton Heating & Air Pasadena

Lennox Furnace Repair in Pasadena: What to Know First

Lennox furnace repair in Pasadena typically runs $150 – $700 depending on the part that failed, and most jobs are completed same day. As an independent Lennox service provider, Dalton Heating & Air Pasadena services all Lennox gas furnace lines – from the entry-level Merit series to the variable-capacity SLP98V – with factory-trained technicians and a written price before any work starts. If your Lennox furnace is blowing cold air, short cycling, or showing an error code, call (626) 657-5344. This page explains what actually goes wrong inside Lennox furnaces in our climate, what it costs to fix, and how we approach the work.

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How Lennox Products Fail – and How We Fix Them

Lennox builds quality equipment, but every line has its known weak spots. After a decade of servicing Lennox furnaces across Pasadena, Altadena, and San Marino, here is what we actually see:

• Pressure switch trips on the G61 and EL296V. These mid-efficiency and two-stage lines use a combustion air pressure switch that gets finicky when condensation lines clog or the inducer motor runs weak. The furnace locks out and blinks an error code. We clean the condensate trap, verify inducer draft with a manometer – that is a gauge measuring airflow pressure – and replace the switch only if it tests out of range.
• Ignitor failure on Merit series (ML193, ML296). Lennox’s nitride ignitors are reliable, but when they crack, the gas never lights and the blower runs cold. We replace with an OEM Lennox ignitor rather than a universal aftermarket part because the amp draw is calibrated to the control board. A universal ignitor can work, but it can also shorten board life.
• Heat exchanger corrosion on older G43 and G50 units. This is the serious one. In Pasadena’s older Bungalow Heaven homes, furnaces often sit in basements or closets that trap moisture from laundry and water heaters. Over 15-plus years, that humidity accelerates rust on the heat exchanger. When we inspect and find cracks or perforation, we red-tag the unit for safety and give you a repair-versus-replacement price in writing, same visit.
• Blower motor failure on EL296 and SLP98V variable-speed units. Variable-speed ECM motors run nearly constantly at low speeds, which is great for efficiency but hard on the module. Symptom: the blower hums, won’t spin, or runs erratically. ECM motors cost more than standard PSC motors – a motor replacement typically lands in the $450 – $700 range – but we’ll quote the exact price before ordering anything.
• Gas valve sticking on ML195 and EL195E. Here is a surprising one: Lennox’s single-stage gas valves sometimes stick intermittently when line pressure from Southern California Gas fluctuates. We check inlet and outlet gas pressure with a manometer, confirm the valve is getting 24 volts, and replace only the valve if needed – not the control board it didn’t damage.

Our Lennox Furnace Repair Process

Every Lennox job follows the same order of operations. It is how The Garrison Standard has been run since 2003:

1. 1
   You describe the symptom. When you call, a live person answers – 24/7. Tell us what the furnace is doing: cold air, no ignition, banging, short cycling. That tells us which parts to load on the truck.
2. 2
   We arrive inside the stated window. A background-checked, uniformed technician shows up with the diagnostic tools for Lennox boards and gas systems.
3. 3
   We test before we touch. We verify the sequence of operation: inducer motor, pressure switch, ignitor, gas valve, flame sensor, blower. On a Lennox, the control board stores error codes – we read them rather than guessing.
4. 4
   You get a written price. After diagnosis, you see the exact repair cost on paper, including parts and labor. No price appears after the work is done. That is the policy.
5. 5
   We repair and test. If we need a part, we explain OEM-versus-aftermarket trade-offs for your specific Lennox model and let you decide. Then we repair, run a full heat cycle, check gas pressure and temperature rise, and verify the error code cleared.
6. 6
   You get a written guarantee. Every repair carries a full-year written guarantee. If it fails within that year, we return at no charge. That is the 365-Day Done Right Promise, and it is not an upsell.

What Lennox Furnace Repair Costs in Pasadena

Most Lennox furnace repairs in Pasadena land between $150 and $700. The spread comes down to which part failed and whether your unit is a basic Merit series or a variable-speed Signature or Elite line.

• Flame sensor cleaning or replacement: $150 – $225
• Ignitor replacement: $225 – $375
• Pressure switch replacement: $250 – $400
• Gas valve replacement: $350 – $550
• Blower motor or ECM module: $450 – $700
• Heat exchanger replacement: often $700+ – at that point, replacement is usually the smarter call

What moves the price: the specific Lennox part number, whether you want OEM or quality aftermarket, and how much disassembly the repair requires. Higher-efficiency furnaces like the EL296V or SLP98V have more expensive components than a single-stage ML193. Call (626) 657-5344 for an exact quote – estimates are free, and you will have a written price before we touch anything.

Why Pasadena Homeowners Call Dalton Heating & Air Pasadena for Lennox Work

Pasadena has no shortage of HVAC companies. The difference is what happens after the phone rings and before the invoice. We answer live, 24/7. Our technicians are factory-trained on Lennox equipment specifically – not generalists figuring it out in the driveway. We service all nine major residential brands – Carrier, Trane, Lennox, Goodman, Rheem, York, Daikin, Bryant, and American Standard – so if your Lennox furnace is done and you decide to compare replacement options, we can quote honestly across brands. Every job carries a written price before any work starts and a written guarantee on every repair. Marco Benitez has been running Dalton Heating & Air Pasadena to that standard for years, and his crew keeps showing up inside the window with the right parts and the right tools. If a repair fails within the year, we return free of charge. That is The Garrison Standard, stated plainly.

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