Nothing is wrong with your unit according to your definition.
A unit does not shut off exactly at your set point ,so if you set it to 68 it would not shut off exactly at 68 plus when heat works fan would run even after flame is off to cool down the heat exchanger. There is also a dead band on every thermostat and it depends how it's setup
The burners are not igniting and the timer turned on the blower thinking the burners were already lit by then. You have a burner/ignition problem. Either the ignighter or themocouple is bad
SOURCE: Furnace blower never blows.
it sounds more like the flame sensor ( a metal rod that is by the burners with a wire going to it and it has a ceramic base). you can try cleaning the rod and if that doesnt work they are not to expensive.
SOURCE: with new digital thermostat furnace runs every 10 min.
You did not say what model you use. Depending on the model , there might be setting for 'deadband' or 'system type'. Changing that value will affect when it turns on. If it switches on that frequently and the room feels comfortable, it might be that your thermostat is placed on wrong place - one which cools of quickly, or there is draft cooling it off. Digital thermostats have a 'learning period' and adjust to dynamic of the room.
SOURCE: I had a friend install my new Goodman GMH950704CX
The most common mistake on these after installation is not flipping the switch on the gas valve from 'off' to "On". Remove the top panel and in the middle of the cabinet the gas line comes into an aluminum looking device. There is a switch on top. If that is on, ensure that the gas has been turned back on.
SOURCE: furnace does not shut off
Easiest way to find out is to disconnect the thermostat or at least the red wire on the thermostat. If it stops, it's the thermostat. If it continues, you will need to disconnect the wire going to the R terminal on the control board. If it stops, it's a crossed thermostat wire. If it continues, its a problem with the control board or relay and you will need a technician.
SOURCE: Goodman GMP075-3 not igniting. Everything cycles
The flash code is due to the furnace not proving flame 3 times in a row. If you have a multimeter you can ohm the ignitor out to see if it is good. Depending on the type (silicon Nitride or silicon Carbide) you can verify if it is good. A silicon Nitride ignitor looks like a small thin straight bar type will ohm @ 11 - 18 ohms, a carbide ignitor looks kinda like a tuning fork (sorta) will typically ohm @ 40 - 92 ohms. anything outside of those ranges will require a replacement.
238 views
Usually answered in minutes!
×