Gas furnace not working

pilot lit on gas furnace, but the burners won't light (Home ...

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Oct 26, 2013 - i have a gas furnace with a lit pilot, but the burners won't light. ... I hv gas furnace we turn thermosate on upstairs but still wont turn on coud turn ...

Furnace Not Starting - Clean the Flame Sensor - YouTube

? 3:15
https://www.youtube.com/watch?v=Ecd5CzJjss4
Jan 4, 2012 - Uploaded by Home Improvement Videos
If you woke up to find that your gas furnace is not starting or it's ... If this sensor gets dirty (and they almost always do over time) then your furnace will try to light, ... working, you can hear it starting, but the burners on not coming on. ... The furnace nowcomes on every time and the house is nice and cozy.

Furnace wont start. What to do before calling the repair man ...

? 10:11
https://www.youtube.com/watch?v=yJxDc90hs4g
Sep 12, 2012 - Uploaded by grayfurnaceman
Our property manager is great about sending a repairman, but the house is a mess. ... While troubleshooting my downstairs furnacethat wouldn't turn on, I turned off the ... Not sure what to do now about flame rollout switch..

Fix Furnace Flame Sensor (Flame That Goes Off) - YouTube

? 1:22
https://www.youtube.com/watch?v=fBJ3r9MUa-U
Nov 29, 2011 - Uploaded by RochNoure
A Furnace Flame Sensor is a safety device that reads the temperature and ... easy fix, but the furnace is ...

Troubleshoot the ignitor of the Rheem RGDA model gas ...

? 5:53
https://www.youtube.com/watch?v=Bx1pXONg2Oc
Dec 12, 2012 - Uploaded by grayfurnaceman
Troubleshoot the ignitor of the Rheem RGDA model gas furnace.... Jun Sim 5 months ago ... My lennox ...Missing: lx2000

Rheem Criterion II No Heat - YouTube

? 0:47
https://www.youtube.com/watch?v=yOSk6qvpWbA
Jan 7, 2010 - Uploaded by Work12Progress
Rheem Criterion II gas furnace model # RGPH-07EAMGR. When a call for heat is made t wo green led's ...Missing: lx2000

Heater will not kick on unless... [Archive] - Self Help Forums

www.selfhelpforums.com/archive/index.php/t-2153.html

Oct 19, 2004 - 25 posts - ‎9 authors
After a certain amount of time of not running, the heater will refuse to kick back on. ... 2 flashes, then a 2 second pause = pressure switch is open. What do .... On LP gas furnaces, the spark starts and the gas valve opens. ... Buffing them up with a little steel wool (5 minute job) is a good annual PM thing to do.

The fan normally runs for a few minutes or so after the gas shuts off.

This removes the heat from the furnace and transfers it into the living space instead of just letting it possibly cause overheating of the furnace until it dissipates. If it is a fan that blows outside, that fan also needs to run for a few minutes to clear exhaust gasses from the furnace - to keep them from dissipating into your home.

Flame sensor might need cleaning and check connections Also check pressure switch .

check for power at gas valve.

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.

try running viniger through it , clean or replace filter , if filter was real dirty you may want to have your evap coil cleaned

have the thermocoupler checked

It sounds like you have an obstruction in the exhaust vent. Thats why when you bybass the pressure switch it runs ok. Steve

clean your heat/flame sensor with sand paper or steal wool. If the sensor is dirty, it won't detect the heat from the flame and it shuts the gas off. Clean the soot and junk off the sensor and it should work fine. I have to clean mine every year. After spending hundreds of $$ every yr on tech calls..I figured out the problem and in 30 sec I'm up and running again.