Common Causes of Furnace Ignition Problems
It’s 6 a.m., the house is 58 degrees, and your furnace is clicking like a stove burner that just won’t light. Maybe the burners flash for three seconds and quit. Maybe nothing happens.
Either way, you’re standing at the thermostat in a coat trying to figure out what to do next. Here’s the good news, ignition problems in Newark homes usually come down to a handful of small parts, and our techs can usually find the problem in about two hours or less.
A Dirty Flame Sensor
If your furnace lights and dies within a few seconds, you’re probably looking at one of the most common ignition problems I see. The flame sensor is a thin metal rod that confirms the burner actually lit. when it’s coated with residue buildup, it can’t read the flame, and the control board shuts off the gas. Looks like a dead furnace.
Cleaning it only takes about 20 minutes. A homeowner out in Ogletown once told me he’d been quoted a new control board before anyone touched the sensor. Honest caveat, if the rod is cracked or the flame looks weak and yellow, cleaning won’t last, and you’re going to need a replacement part.
Igniters Wear Out in the Cold
Most newer gas furnaces light the burners with a small ceramic element that glows until the gas catches. They’re brittle. They crack, or they weaken slowly while nobody notices.
A tired igniter gets through October because the furnace barely runs. Then a January cold snap hits, the unit cycles all day, and the igniter finally quits. You’ll hear the click, see a dull orange glow, and get no flame. Replacement usually runs 45 minutes to an hour. Worn-out igniters cause plenty of the ignition problems I get called out for. If you’re unsure give us a call.
Blocked Vent Pipes and Pressure Switches
High-efficiency furnaces breathe through white PVC pipes that run out the side of the house. A wet Newark snow drifting against the wall can block them. The pressure switch notices the venting is off and stops the startup before the gas valve ever opens.
After a heavy snowfall, walk outside and look at those pipes. Clear snow by hand, nothing sharper, and leave the pipes themselves alone. If they’re clear and the furnace still won’t start, the switch or a cracked rubber hose may be bad. Testing it with a gauge takes about 30 minutes. Guessing means buying parts you didn’t need.
These venting-related ignition problems fool people because the furnace sounds like it’s trying.
What to Check Before You Call
Give yourself ten minutes for three checks. Make sure the thermostat reads HEAT with the setpoint above room temperature, and swap the batteries if it takes them. Pull the filter; a clogged one can overheat the furnace until a safety switch trips, which looks exactly like an ignition failure. Then look at the breaker.
Here’s where I’ll be blunt. Hitting reset once is fine. Hitting it five times just wipes the clues. Never bypass a safety switch, and keep your hands off the gas fittings. Write down any blinking error code first, because a tech can read it like a road map.
If all three checks pass and you’ve still got ignition problems, that’s your cue to pick up the phone.
Get It Fixed Before February
Boulden Brothers handles furnace and heater repair in Newark, and I’d rather you call about a sensor now than a dead system at 2 a.m. in January. Timely repairs cost less than emergency ones. Guessing at parts means paying twice. Fixed right the first time is the goal, so call (302) 368-3848.
Furnace Ignition Problems FAQ
Why’s my furnace clicking but nothing lights?
Clicking means the igniter or gas valve is trying and failing. A cracked igniter or a gas supply hiccup can both do it. If your other gas appliances are acting up too, tell the tech.
Furnace lights then shuts off in seconds, what gives?
Usually a dirty flame sensor that can’t see the flame, so the board kills the gas. Cleaning takes under an hour. If it keeps coming back within weeks, the sensor likely needs replacing.
Can a dirty filter cause ignition problems?
Not directly. A clogged filter overheats the furnace, a limit switch trips, and the shutdown mimics an ignition failure. Swap it first. It’s a two-minute fix and cheap.
Should I keep hitting reset on a furnace that wont start?
No. One reset tells you if it was a fluke. After that, you’re just wearing on parts and wiping the clues. Timely repairs beat reset roulette.
Do cold Newark winters make ignition problems worse?
Mostly through run time. Newark’s January cold keeps the furnace cycling far more than October does, and weak parts fail under that load. Snow drifting over outdoor vent pipes after a storm makes it worse.
Go put a sweater on. The furnace won’t get any warmer by being stared at.
