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Disconnect the black power wire where it is connected to the furnace with breaker off. Put a wire nut on it and then turn the breaker on. If it continues to trip, the problem is not the furnace and you will have to trace the power wire back to the breaker box to find problem. Next, disconnect the black wire from the breaker (with breaker off) and then snap breaker on. If it trips, bad breaker. If the furnace was disconnected and breaker did not trip, you have a short either on the P C Board or the transformer.
I need a little more info I feel certain I can solve the problem I need to know a couple of things. 1- Model # of the furnace, take off the top door look to your right or left you will see a little metal data plate on the top of the plate you will see the model # If it is a horizontal furnace the data plate will be on the same side the controls are on . 2- Is the furnace a natural gas, LP gas, fuel oil or electric? 3- Does it do this when the temperature is above freezing? 4- If you could list the parts replaced it would be helpful. A furnace properly maintained can last upwards of 25 years.
Yes you can and if originally installed by code ther
should be either a fused disconnect or a breaker mounted on the furnace. The fuse will have a cover
and a black switch below or above it.
If nothing is there but romex wire cable, then it is
hard wired in and most likely will have to be shutoff
at the fuse or breaker panel.
It is more dangerous to turn off at the fuse or breaker
panel. I recommend shutting the thermodtat to
the off position. If the furnace is within 10 years
old you could remove the top door and then lower door. The lower door when in place holds a switch
in that lets the power pass through it, when removed
your furnace should not operate.
Take my advive3 and do the simple thing and turn
the thermostat to the off position.
Good one! Is the flame getting to the flame sensor within the few seconds? Maybe a good cleaning of the burners or flame tray would help. 1.3 ma is enough for the flame rod to tell the board to stay on. Re-do all the ground connections both at the board and furnace cabinet to be safe. Check the polarity of the power going to the furnace. What are the chances the second board is bad?
Sounds like a dirty flame sensor.
Also 9 degrees is a large swing to recover. Most specialist will advise no more than a 5 degree set back, otherwise recovery time eliminates any savings you may achieve.
This usually caused by a dirty flame sensor. This is typically a small round rod with a ceramic base. the rod will be mounted directly in front of one of the burners with the rod in the flame. To clean it....
Turn off power to the furnace.
Remove the flame sensor.
Clean the rod with steel wool ( never use sandpaper! )
Inspect both the intake and exhaust pipes for blockage or debris. Inspect the small tubes that go from your combustion fan to the pressure switch and the tube that goes from the fan to the condensate drain. They all should be clean and dry. Inspect the combustion fan to see if it spins without it scraping on the housing or it may be filled with water or debris. Last, check the air filter and clean or replace.
sounds like the fan switch in the furnace is coming on and off. This is common for Goodman. or could be the heat anticipator on the t-stat. While there are several reasons this happens these are the most common.