Goodman Furnace Won't Ignite: Causes, Fixes & Costs
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Goodman furnace won't ignite: what it means
“Won’t ignite” describes a Goodman gas furnace that goes through its startup sequence — inducer runs, igniter may glow — but never establishes and proves a stable flame. The furnace either shuts down, retries, or drops into a hard lockout after several failed attempts.
On most Goodman boards this shows up as a 1-flash ignition failure lockout after the control makes several ignition trials (usually three) without proving flame. Some conditions upstream (a stuck pressure switch, open limit, or open rollout) prevent ignition from ever being attempted and produce their own distinct flash codes instead.
Whether the furnace auto-resets or stays locked out varies by board. Most Goodman controls hold the lockout for about one hour, then automatically retry, or clear immediately when you cycle power at the breaker. Repeated manual resets are not a fix and can be unsafe — see the DIY boundary below.
Goodman furnace won't ignite: common causes, ranked by probability
- Failed or cracked hot-surface igniter. The most common ignition-failure cause. Goodman igniters are brittle silicon-carbide or nitride elements that crack or burn out with age. The board may still send voltage, but the element won’t glow.
- Dirty or failed flame sensor. The furnace lights but the flame rod can’t confirm the flame, so the board shuts the gas within seconds and eventually locks out. Oxidation on the sensor is extremely common.
- No or low gas supply to the burners. A closed manual gas valve, tripped meter, empty propane tank, or a partially clogged burner orifice starves ignition.
- Faulty gas valve. The valve fails to open or opens intermittently, so no fuel reaches the glowing igniter.
- Weak flame due to dirty burners. Rust, spider webs, or debris in the burner assembly cause a small or erratic flame that fails to prove.
- Grounding or wiring fault. The flame-sense circuit needs a solid burner ground. A loose ground, corroded connector, or damaged harness causes false ignition failures.
- Control board failure. Less common, but a board that mis-times the ignition sequence or won’t energize the igniter/valve will prevent ignition.
A typical field troubleshooting order for an ignition-failure lockout is to confirm the igniter first, then flame sense, then gas supply, then wiring and the valve — roughly the order above.
How to fix Goodman furnace won't ignite: safe checks first
These are the only checks a homeowner should perform. Everything inside the cabinet is technician work.
- Air filter: A severely clogged filter can trip limits and interrupt the ignition cycle. Replace if dirty — match the size printed on the edge of the filter already in the unit.
- Thermostat: Confirm it’s set to Heat and the setpoint is above room temperature. Replace batteries if it’s battery-powered.
- Breaker / furnace switch: Make sure the furnace breaker is on and the service switch (looks like a light switch near the unit) is on. Cycle it off/on once.
- Gas supply: Verify the manual gas shutoff at the furnace is parallel with the pipe (open), and that other gas appliances (stove, water heater) are working. For propane, check the tank gauge.
- Vents and registers: Make sure supply and return registers are open and unblocked.
- Condensate drain (high-efficiency models): A full condensate trap or clogged drain can trip a switch and block startup. Check for standing water or a full float switch.
- One reset: You may cycle power at the breaker once to clear a lockout. If it fails again, stop and call a pro. Do not repeatedly reset.
If you ever smell gas, do not reset the furnace — leave the house, and call your gas utility’s emergency line or 911 from outside.
How a technician will diagnose it
A qualified tech will:
- Read the flash code and note the failure point in the ignition sequence.
- Watch a full startup cycle to see whether the igniter glows and whether the flame lights and holds.
- Test the hot-surface igniter for resistance and continuity with a multimeter.
- Measure flame-sense microamps at the flame rod; a low reading points to a dirty sensor or grounding issue.
- Check gas pressure at the valve inlet and manifold with a manometer.
- Clean or replace the flame sensor and inspect burners for debris.
- Verify the gas valve opens on demand and check burner grounding and wiring connectors.
- Confirm proper venting and pressure-switch operation feeding the ignition sequence.
- Replace the failed component and verify several clean ignition cycles.
If a quote jumps straight to a control board without igniter, flame-sense, and gas-pressure testing first, ask why — the board is rarely the first culprit, and it’s the most expensive guess on the list.
Symptom, cause and what to do
| Symptom | Likely cause | DIY action | Technician job |
|---|---|---|---|
| Igniter never glows | Cracked/failed igniter or bad board | Reset once; check breaker | Test and replace hot-surface igniter |
| Lights then shuts off in seconds | Dirty flame sensor / grounding | None | Clean or replace flame sensor, verify ground |
| Clicks but no flame | No gas or faulty gas valve | Confirm manual gas valve open | Test gas pressure, replace valve |
| Small or yellow flame | Dirty burners / low gas pressure | Replace filter | Tech cleans burners and verifies manifold pressure |
| Fails on some cycles only | Weak sensor signal or intermittent valve | None | Measure microamps, inspect valve and wiring |
| No startup at all | Locked out or upstream fault | One breaker reset; check filter | Diagnose lockout, pressure switch, limits |
Goodman furnace won't ignite repair cost
Honest US ranges, parts and labor included. Prices vary widely by region, after-hours rates, and how hard the part is to source:
- Diagnostic / service call: $80 – $180
- Flame sensor clean: $80 – $200
- Flame sensor replacement: $130 – $280
- Hot-surface igniter replacement: $150 – $350
- Burner cleaning: $150 – $300
- Gas valve replacement: $350 – $900, and more on some models
- Control board replacement: $400 – $1,200 installed
- Homeowner-replaceable items (filter, thermostat batteries): $0 – $30 DIY
Igniter and flame-sensor issues cover the large majority of Goodman “won’t ignite” calls, so most repairs land in the $130–$350 range. The gas valve and integrated ignition control board are the worst-case outcomes — treat the upper figures above as realistic, not as a ceiling, and get a second quote before approving a board swap on an older furnace.
Related codes
Flash-code meanings differ between Goodman control boards and vintages, so confirm the code against the legend on your own furnace’s door label before relying on any of these:
- Goodman Furnace 1 Flash: Ignition Failure Lockout Fixes — the specific flash code most “won’t ignite” faults produce.
- Goodman Furnace 7 Flashes: Gas Valve Circuit Error — on the common Goodman/Amana ignition-control chart, 7 flashes points to a fault in the gas valve circuit.
- Goodman Furnace 8 Flashes: Low Flame Signal Fixes — on that same chart, a weak flame-sense signal is reported as 8 flashes: the flame lights but proves too weak.
- Goodman Furnace Lockout: Causes, Fixes & Costs — what a hard lockout means and how it clears.
- Goodman Furnace 2 Flashes: Pressure Switch Stuck Closed and 3 Flashes: Pressure Switch Stuck Open — upstream faults that block ignition from starting.
- Goodman Furnace Short Cycling: Causes, Fixes & Costs — if ignition succeeds but the burner won’t stay lit.
- Goodman Furnace Won’t Turn On: Causes, Fixes & Costs — when nothing happens at all.
Parts & tools for this fix
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Frequently asked questions
Why does my Goodman furnace click but not light?
The clicking is the gas valve or ignition relay trying to fire. If no flame follows, the hot-surface igniter is often cracked, or gas is not reaching the burners. This is technician work inside the cabinet.
Can I fix a Goodman furnace that won't ignite myself?
You can safely check the filter, thermostat, breaker and gas supply valve, and try one reset. Replacing igniters, sensors, valves or boards requires a licensed HVAC tech and a multimeter.
How much does it cost to fix a Goodman that won't ignite?
A hot-surface igniter runs about $150 to $350 installed. A flame sensor clean is $80 to $200. A gas valve or integrated control board is the expensive end — figure roughly $400 to $1,200 or more including labor, depending on the part and your local rates.