What causes carbonmonoxide in a furance - Goodman Heating & Cooling

that can be caused by transmission wrong gear selection or transmission solenoid errors or catalic convertor or egr system stuck open mixing oxygen with carbonmonoxide excessive

It is difficult trying to understand what you are trying to convey to me. If you live in an older house, this may be the problem. Your furance, refigerator and range hood may all be on the same circuit. Your furance should have a dedicated circuit, nothing else on it. The refigerator should be on a dedicated circuit also, the range hood can be on a circuit with other devices. To find out what is on a curcuit, go to the panel and find the circuit that powers the fridge, have someone watch to see when the light goes off in the fridge, that will be the fridge circuit. Now check and see if anything else is off, eg. if the range hood doesn't work, then it is on the same circuit. If the furance fan will not operate then it is also on the same circuit. Do the same thing with the furance circuit, turn if off at the panel and see what else does not work.
Remember, the furance and the refigerator need to each have their own dedicated circuit.

Multiple issues that are not related. If the pilot light goes out then the thermocouple might be bad. If the pilot ignites the gas and everything shuts off, it sounds like the over temperature sensors are detecting heat in excess of what is allowed in the firebox. The thermostat issue has nothing to do with this.

No its antifreeze leaking ,you need a new radiator in the heater ,means taking the dash out i think though

Sounds like limit switch issue. Furnace heats up, high temp limit switch opens, fan will stay on. GMP model is older and do not have the codes.
May be over fired, have airflow problem, to cause the limit to open.
Next time before shutting off power, try to find the limit, it has two wires that connect to a 1.5 x 2 inch card mount to the furnace fire wall. tap on it and see if the blower stops. If so replace the limit.

The furance needs to be clecned. Is the furance in the sdame roomas a clothes dryer. Lent can plug up the furances burrner tubes. With a shop vac switched to the blower side blow out the tubes and cleran the unit. Be careful not to touch the hot surface igitor while cleaning. These will crack easily.

Sounds like a problem with the furances circuit board. With the furance powered off, disconnect the two wires at the circuit boards thermostat terminal strip. These are probably red and white wires connected to the "Y" and "C" thermostat terminal strip on the circuit board. These two wires send 24 volts to the outside A.C. condenser unit when the thermstat is se tinto the cooling mode. With the thermostst in the "off: postion measure across the "Y" & "C" terminals at the furances thermostat terminal strip. If you have voltaged than either the board or thermostst has failed. The next step to determine which has failed is this. Disconnect all the thermostat wires at the furance. To check the heating circuit jumper across the "R" & "W" terminals, the furance should fire off for the heating circuit and run non stop beacause the thermostat is no longer controlling it and is isolated from the furance. Now remove the jumper and jumper across the "R" &"Y" terminals, the blower should run at your furance for the cooling mode and you should have 24 volts across the "Y" & "C" terminals for the outside A.C. condenser compresor contactor.Next check for blower operation by jumpering across the "R" & "G" terminals. If everything checks outs than the thermostst is the problem. Tou may also want to check the control wiring at the thermostts , furance & out side condenser unit. If the wiring has connnected somewhwre between these points or at the terminal connection this may also be bring on the A.C. when the thermostat is in the "off position.

have the ac company check the actual blower wheel itself it may be slowly coming apart

a short between the red and green wires.red 24v green fan

Hi Cableman. Any 24-36" thermocouple wll work and can be found at your local hardware store.

Hope this helps,
RepairUSA