Question about Heating & Cooling
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Posted on Jan 02, 2017
SOURCE: goodman gmp075-3
I am confident the technician(s) have done this but check anyway.
Gas pressure 4-7 inches W.C for natural, 10 - 11 for Propane.
Air filter clean and unrestricted.
Temperature over supply plenum 140 degrees F.
All registers open and unrestricted.
Vent and intake unrestricted and not blocked.
Condensate hoses free of debris and draining.
OK now lets check to see if the furnace is staying on long enough.When it runs for a heat cycle, is the flame staying on until about 2 minutes prior to achieving the set temperature or is it cycling everyfew seconds and never reaching temp? To check you will need to view the flame through a small viewing port of thru the fins in the front door. Watch them for 10 to 15 minutes.
If they are staying on a long time, we will need to see if the room blower is working properly. If they are going out quickly and or cycling. Get the technician on the pone to talk it over. It could be a safety sensor.
If the blower stays on and the burners are on as well, you have a door open somewhere. Just kidding. Remove the thermostst documenting which wires go where. Take the white wire and cross it with the red wire. This will (or should) turn on the furnace. Clamp them together untill the either the house gets warm or you are confident it is not going to reach temperature. If it did get close to the temperature you wanted, it is a thermostat issue. If not, you got me!
And they say we have an easy job! Get beck to us with your results.
Posted on Jan 23, 2008
When you call for fan in auto ensure your getting 24 volts at pin on control board, if it is not energizing then there is a problem with the relay.. Before you change out the expensive control board, try the therm..
Posted on Dec 09, 2008
You can sand the flame sensor but it sounds like another problem. Sounds like a limit switch or something in the control circuit, You need to have a service tech look at this. Ask for free estimate on repair. I have worked on hundreds of these units and they are sometimes tricky to work on. Lenox has come up with new controls for the whisper heat furnace to replace the old ones. If the flame sensor is bad the unit will try to light a few times and lock out and you ahve to kull power to the furnace to reset. If this is whats happening clean the sensor nd you should be ok If not you need help from a service tech.Rus
Posted on Nov 11, 2009
SOURCE: flame sputters
Hey welcome to the world of oil burner service!! :-) Theyare a finnicky beast to say the least. The problem you are having sounds like an air mixture problem. A combustion analyser would be the best tool to have but being that you probably don't have that try this. On the left side of the burner as you are looking at it is an air adjust ment ring and a fine tuning ring. the fine tuning ring is probably all you need to adjust. There is a screw that is usually right behind or near the pipe coming out of the pump and going into the burner. Loosen that and turn the ring away from you just a bit to close off some of the air and you will be fine. The burner is running a bit to lean. If you can see the flame turn the adjustment closed just until the flame color turns from a almost white color to a slightly orange color. Then you should be fine. Good luck!!
Posted on Nov 15, 2009
I have the same issue with a G21Q4-5-100-1 model lennox. House drops 8 - 10 degrees. I have 3 thermostats and all react the same way. I was told by service tech that the Ignition Coontrol Module is bad and acting intermittanely. ???
Posted on Feb 16, 2010
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