Question about Goodman GDS80904BNA Open Flame Heater
Here is the situation:
Thermostat calls for heat
Draft blower engages and runs
Board clicks and igniter gets glows after a few seconds
Board clicks. Gas valve does not open, Igniter stops glowing, Draft blower stops running, LED on control board goes out. No flush.
I reset the Control board by cutting power to furnace.
LED on control board goes solid red and the same thing repeats again.
I checked continuity from board to gas valve and is ok.
I engaged the gas valve with 24V and gas valve opens and puts out gas
I checked the voltage on gas valve and there is no voltage at any time during the start up.
The control board works fine on cool mode (AC runs fine)
SOURCE: no hot surface igniter
This is why swapping parts is never a good idea. It could be a board, pressure switch, or several other issues. I'm a service technician and realize that many furnace issues are difficult to diagnose over the phone, or internet.
Calling a qualified, NATE certified technician to diagnose and repair this properly is probably the best solution that I could suggest. Yes, there will be a bill and it will be expensive, but it will be a lot less so than changing out parts you might not need.
Posted on Jan 03, 2009
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1. Thermostat calls for heat. 2. Draft inducer motor starts. 3. Pressure switch attached by a small plastic or rubber tube senses the negative pressure produced by the draft inducer and closes. 4. Draft inducer runs for 30 seconds to a minute before you hear a gas hissing sound. The ignitor did not glow, the flame sensor (a small metal probe about 1/8" in diameter, with a white porcelain base) does not sense the flame, so after 8 to 10 seconds the hissing sounds stops with no ignition of gas to heat your home. Your furnace shuts down and goes into a lock out condition until you turn your power switch back off and on again. Then the sequence starts all over again with no ignition of the gas. Solution:You probably need to purchase and install a new ignitor. I would suggest that you inspect your ignitor closely for cracks. Make sure you do not touch the ignitor with your bare hands. If you do not visually see a crack, then you could have a furnace control board problem or a limit, rollout switch problem. The furnace's control board might not be supplying the voltage to the ignitor. If your furnace lights and the gas stays on for 8 to 10 seconds, then shuts right back off, then you need to clean your flame sensor with light sand paper or steel wool. You might need a new flame sensor, but most of the time they can be cleaned an will work well after cleaning.
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