FURNACE TUNE-UP IN LEHI — BEFORE THE FIRST COLD SNAP

Most "furnace tune-ups" advertised for $49 or $79 are 15 minutes of visual inspection and a filter change. That's not maintenance — it's a sales call dressed up as service. A real tune-up takes 60 to 90 minutes (longer on dual-zone Lehi systems where we exercise every damper), pulls panels, cleans combustion components, and measures things with actual instruments. Done every September or October before the first hard cold snap, it catches the four or five failures that would otherwise send us out on an emergency call in January.

Lehi homes have specific service items that don't apply elsewhere on the Wasatch Front. Two-stage and modulating furnaces — common in Lehi's larger square footage — need both stages tested and the staging relays verified. Dual-zone damper systems need every actuator exercised because builder-grade actuators are right at the 8-12 year wear point. Hard Lehi water means condensing units accumulate scale on the condensate trap faster than valley homes. And smart-zoning thermostats benefit from a calibration check on outdoor reset and balance points.

What's actually included

• Combustion chamber and burner cleaning — carbon and soot removed with brush and compressed air, flame pattern verified visually
• Flame sensor clean and test — steel wool the rod, measure microamp signal (should be 4-10 µA for reliable operation)
• Heat exchanger visual inspection — cracks, rust, stress fracturing, CO leak risk
• Pressure switch test — verify it opens and closes at spec, catch drift before it causes a lockout
• Hot surface ignitor resistance check — ohm-out the ignitor, catch the "about to fail" signature
• Gas pressure measurement — manifold pressure set to manufacturer spec, both stages on multi-stage units
• Blower motor and wheel cleaning — remove accumulated dust, check amp draw against nameplate (ECM and PSC)
• Condensate drain and trap flush — hard-water scale buildup is faster in Lehi, full flush prevents lockout
• Damper actuator exercise (dual-zone) — every damper opened and closed, actuator current measured
• Bypass damper calibration check — verify position matches blower CFM curve
• Combustion analysis — CO, O2, CO/air ratio, flue temp on a calibrated analyzer, documented on the service ticket
• Thermostat calibration — verify temp accuracy, balance points on dual-fuel, staging on multi-stage

What you actually get

At the end of the visit, a written report listing every test result and any component outside spec. If something's borderline — flame sensor microamps at 3 instead of 6, for example, or a damper actuator drawing high current — we'll flag it and recommend replacement now rather than at 11pm in January. If everything looks good, the report documents that too, which matters for warranty claims and home sale inspections.

Why now vs. spring

Do it in September or October. Two reasons. First, if we find a bad component, you have weeks to replace it on a non-emergency basis instead of a surcharge-era call. Second, dust and debris that accumulated over summer (when the blower still runs for AC) need to come off before the burner fires hard for the first time. Lighting a dust-coated furnace on the first cold night of October is how you get that burning-dust smell — and occasionally a smoke alarm — for the first hour of the heating season.

Multi-stage and dual-zone specific

This is where Lehi tune-ups differ from a typical service call. On two-stage furnaces, we run the unit through both stages and verify the staging relay timing. On modulating units, we verify the modulation control board is hitting expected gas-valve voltages across the firing range. On dual-zone systems, we exercise every damper individually, measure actuator current draw, and verify the bypass damper position matches the new blower CFM. Builder-grade Honeywell TrueZone and EWC Ultra-Zone systems are now 8-12 years in across the 2014-vintage Lehi cohort, which is the cohort where damper actuators start failing.

What Valley does differently

Every tune-up includes the combustion analysis and the written report. We don't upsell parts that aren't needed. If your 6-year-old furnace is healthy, the report says "healthy" and we leave. If we find a cracked heat exchanger, we document it with photos, shut the unit down for safety, and give you honest repair-vs-replace math. Quality Service Club HVAC ($199/year per unit) includes the annual tune-up, 15% off repairs, priority dispatch, and 1-year parts/labor warranty on anything we repair during the year — pays for itself the first time we catch a borderline pressure switch in October instead of January.