Question 1

What should I check if my furnace won't turn on?

Accepted Answer

Verify the thermostat is on 'heat' with the setpoint above room temperature. Confirm the furnace power switch is on and the breaker has not tripped. Make sure the gas supply valve is open. Also check that the furnace access panel is fully closed — most units have an interlock switch that prevents operation when the panel is off.

Question 2

Why is my furnace completely dead — no lights, no sounds?

Accepted Answer

If there are no indicator lights on the control board, the furnace has no incoming power. Check the circuit breaker, the furnace power switch, and confirm the outlet is live. If power is reaching the unit but the board is dark, the onboard transformer has likely failed.

Question 3

What does a flashing light on my furnace mean?

Accepted Answer

Nearly all modern furnace control boards include a diagnostic LED that blinks a specific pattern corresponding to a fault code. The code reference chart is typically printed on a sticker inside the cabinet door. Record the blink sequence and relay it to your technician — it speeds up diagnosis significantly.

Question 4

Why won't my furnace turn on at all?

Accepted Answer

Start with the basics: check that the thermostat is set to heat and the temperature is set above room temperature, then verify the furnace power switch (usually a light switch on or near the unit) is in the ON position. Also check your breaker panel for a tripped breaker. If all of those check out, the issue is typically a failed control board, blown fuse on the board, or a bad transformer — you'll need a technician at that point.

Question 5

My thermostat is on but the furnace won't start — what should I check?

Accepted Answer

First, make sure the thermostat display is lit and the batteries aren't dead — a blank screen means no signal is reaching the furnace. Next, check that the furnace door panel is fully seated, because most furnaces have a safety switch that kills power if the panel is even slightly ajar. If neither of those is the issue, the problem is usually in the control board, wiring, or a failed component like the inducer motor or pressure switch.

Question 6

What does it mean when my furnace clicks but doesn't start?

Accepted Answer

Clicking usually means the control board is sending the signal to ignite, but the ignition sequence is failing. The inducer motor should start first, then the pressure switch closes, then the ignitor glows, and finally the gas valve opens. If you hear clicking but no whoosh of ignition, the hot surface ignitor is likely cracked or worn out — it's one of the most common furnace repairs we do and takes about 30 minutes.

Question 7

Can a tripped breaker cause my furnace not to turn on?

Accepted Answer

Yes, and it's more common than people think. Furnaces draw power for the control board, inducer motor, ignitor, and blower motor. A power surge, short in the wiring, or a failing blower motor can trip the breaker. Reset it once — if it trips again immediately, do not keep resetting it. That indicates an electrical fault that needs professional diagnosis to prevent a fire hazard.

Question 8

Is a clicking noise from my furnace normal?

Accepted Answer

Some clicking is normal during the ignition sequence — the control board relay clicks, the gas valve clicks open, and the ignitor sparks in spark-ignition models. Rapid or continuous clicking that doesn't lead to ignition usually means the ignitor is failing, the gas valve isn't opening, or the control board has a fault. If the furnace clicks repeatedly without starting, it needs service.

Question 9

Why does my furnace pilot light keep going out?

Accepted Answer

A pilot light that won't stay lit is usually caused by a faulty thermocouple — the safety device that detects whether the pilot is burning. When the thermocouple fails, it tells the gas valve to shut off even though the pilot is fine. A dirty pilot orifice or a drafty area near the furnace can also blow out the pilot. Thermocouple replacement is a straightforward, inexpensive repair.

Question 10

How do I relight my furnace pilot light?

Accepted Answer

Turn the gas valve knob to 'OFF' and wait five minutes for residual gas to clear. Then turn it to 'PILOT,' press and hold the knob down, and use a long lighter to ignite the pilot. Hold the knob for 30–60 seconds after the pilot lights to let the thermocouple heat up, then release and turn to 'ON.' If the pilot won't stay lit after two attempts, call a technician — forcing it creates a gas buildup risk.

Question 11

How do I know if my furnace ignitor is bad?

Accepted Answer

The most common sign is the furnace going through its startup sequence — you'll hear the inducer motor kick on — but the burners never light. The ignitor glows orange when it's working; if you can safely see it and it doesn't glow during the ignition cycle, it's failed. Most ignitors last 3–5 years. We carry common ignitor types on our trucks and can replace them in a single visit.

Question 12

How much does it cost to replace a furnace ignitor in Asheville?

Accepted Answer

A furnace ignitor replacement in Asheville typically costs $150–$300 including the part and labor. The part itself is $30–$80 depending on the furnace model, with the remainder covering diagnosis and installation. It's one of the most common and affordable furnace repairs, and most technicians can complete it in under 30 minutes.

Question 13

Why isn't my thermostat turning on the furnace?

Accepted Answer

The most common culprits are dead thermostat batteries, the thermostat being set to cooling mode instead of heating, or a tripped float switch if you have a condensing furnace. If the thermostat screen is on and set correctly, the issue may be a broken wire in the thermostat cable, a blown fuse on the furnace control board, or a failed transformer. We can diagnose thermostat-to-furnace communication issues quickly with a multimeter.

Question 14

What should I do if my furnace breaks down in the middle of the night?

Accepted Answer

First, check the basics — thermostat settings, air filter, and breaker. If those don't fix it, call us for emergency service. While waiting, use space heaters safely (keep them 3 feet from anything flammable and never leave them unattended), close off unused rooms to conserve heat, and open cabinet doors under sinks on exterior walls to prevent frozen pipes. Never use your oven or stove for heat — it's a carbon monoxide hazard.

Question 15

What is the furnace error code flashing on my unit?

Accepted Answer

Most modern furnaces have a diagnostic LED on the control board that flashes a code when something is wrong. The number of flashes corresponds to a specific fault — for example, 3 flashes might mean a pressure switch error while 4 flashes could mean an open high-limit switch. The code chart is usually on a sticker inside the furnace panel door. Note the flash pattern and call us — we can often narrow down the issue over the phone before dispatching a technician.

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