Click, click, nothing: an Avondale furnace on the coldest morning of January

The fast answer for a furnace that clicks and quits

Picture the furnace in the hall closet of a 1924 bungalow on a brick street in Avondale starting its sequence at 6:10 a.m. on the coldest morning Jacksonville will see all winter. Whir of the inducer. Click. Click. Click. Then silence, and the blower pushing cold air for a minute before everything shuts down. Three minutes later it tries again.

Here is the fast version: a furnace that clicks and never lights has an ignition problem, and the three usual suspects are a failed hot-surface igniter, a flame sensor coated in oxide, or a pressure switch that will not close. All three are same-visit repairs with parts on the truck. A furnace that lights, runs three or four seconds, and shuts off is almost always the flame sensor. A furnace that does nothing at all, no inducer, no click, is a control board, a door switch or a thermostat.

Set the thermostat to OFF so it stops cycling, confirm the gas is on at the meter, and call 866-266-5709. The rest of this page explains what you are paying for.

Why Jacksonville furnaces fail the way they do

Natural gas furnaces are concentrated in the pre-1950 core served by TECO Peoples Gas: Riverside, Avondale, Ortega, San Marco, Springfield, Murray Hill and parts of Lake Shore. They share two circumstances that shape the repairs.

First, the idle season. A furnace here runs on perhaps twenty or thirty mornings a year, in a cluster between December and February, and then sits from March through November in air whose dew point sits in the 70s. Flame sensors oxidize. Igniters grow brittle. Burner ports collect rust flakes. Spiders and mud daubers find the inducer housing and the flue. The first cold snap after the Florida-Georgia game is when all of it is discovered at once.

Second, the house itself. An Avondale or Springfield closet furnace is often a replacement for a replacement, sitting on a platform built for something else, drawing combustion air from a hallway and venting through a flue that predates it. Return air is short, the ducts were added in a different decade, and the exchanger has run hot for years on low airflow. That is how exchangers crack, and why we measure temperature rise on every call.

Electric furnaces are a different population: 1950s to 1970s block ranches in Arlington and Westside, and manufactured homes along US 301 near Bryceville and US 90 toward Macclenny and Sanderson. There the failures are sequencers, heat strip elements, limit switches and the relays that stage them, and the symptom is a JEA bill that doubled while the house stayed cool.

How the diagnosis runs

A furnace call at Cook’s is a safety inspection first. The technician checks for gas odor and tests for carbon monoxide at the registers before anything else. Then the sequence: thermostat call, inducer, pressure switch, igniter, gas valve, flame, flame sensor proof, blower. Each step is watched and measured. The heat exchanger is inspected with a camera. Combustion is analyzed. Temperature rise across the furnace is compared to the nameplate range. On an electric furnace, each strip is clamped for amp draw and each sequencer timed.

Only then is a part named, a price given, and a repair started.

Call for furnace repair

Where each furnace repair sits on the scale

Access matters: a tight Springfield closet or a Murray Hill attic takes longer than a Mandarin garage. The hour does not. Cook’s charges the same at 6 a.m. on a freeze morning as at 2 p.m. on a Thursday.

When repair stops making sense

A heat exchanger cracked on a furnace past fifteen years is a replacement, not a repair. So is a gas valve failure on a unit that has already had an igniter and an inducer replaced in recent memory. In those cases you get a furnace quote and, because most Jacksonville homes only need heat on a couple dozen mornings a year, a heat pump or dual-fuel quote beside it, so you can compare with real numbers.

Getting here, any hour

Jacksonville sits about 74 minutes north of the Cook’s headquarters at 37 Fairmont Lane, and the heating-season routes are planned around the freeze forecast. When a hard freeze warning is posted, agreement customers are called first, the trucks carry extra igniters and sensors, and the phone is answered all night. A no-heat call with an infant, an elderly relative or a medical device in the house is treated as an emergency at any hour.

We repair gas, propane and electric furnaces from Lennox, Carrier, Bryant, Trane and any other maker, plus the oil furnaces in a few older Ortega and Fernandina homes.