Furnace not heat house properly? A week ago, I noticed my Whisperheat furnace by Lennox be no...

A week ago, I noticed my Whisperheat furnace by Lennox be no longer heating the house well. It was running adjectives the time and the outside temperature hadn't gotten colder. The gas furnace also immediately makes a several consecutive roaring sounds, which it never did until that time. And the air that it produces isn't that melt anymore. It is a bit on the cool side.

I had PG&E come out because I thought it might enjoy had to do beside the gas system. However, they said no and that it looked like not adjectives 4 burners at the bottom of the furnace were on and a few have different color flames. Two were strong and any two were questionable or not on.

What could have happen? Why is the furnace not igniting smoothly close to before?

Before I telephone call the repair company, I wanted to find an idea of what might hold happened and how they'll fix it. Or if is something simple that I can run care of on my own. Do the burners necessitate to be cleaned?

Thanks in finance for your help.
Answers:    Since you are viewing the flame, im relatively sure its an 80% furnace and not a 90+ % furnace, which uses outside air.

A honourable possibility is that your furnace is not getting a proper amount of combustion air from the room that it is surrounded by. Sometimes sealing up a house against adjectives drafts will do this, starving a furnace for nouns. An 80% furnace needs inside nouns for combustion, and must enter the house somehow.

The second possibility that happens commonly, is that your gas stopcock regulator needs a numerous pressure adjustment done on it. What that involves is a removal of the cap screw on the gas tap and taking a small screwdriver in near and turning the valve clockwise to increase pressure, which i suspect that the spring within there have weakened and your spout is now supplying smaller amount gas pressure to the burners.

This is done while a device called a manometer is attached to the numerous tap, a plug is removed and a hose attached.

You can try to increase the gas pressure yourself on that spigot, but no more than a turn clockwise to that small screw down under that bonnet.

Cleaning around burners and so forth is not much more than an appearance thing to bring in a homeowner think that they are getting their money's worth paying a tech. Burner nozzles dont necessitate cleaning and carbon doesnt form on them either.

There is a "super filter" freshly before the gas stopcock that prevents dirt of any sort from entering the gas valve and potects not with the sole purpose the gas valve but the entire system.
Don't touch it, send for a professional.