Remove all the low voltage control wires from the thermostat, on the terminal board there is ,
R or Red = 24 volt "hot leg"
W or White = Heat circuit.
Y or Yellow = Cool circuit
G or Green = Fan circuit.
C or Common = 24 volt "neutral leg"
The R and C terminals are the 24 volt power supply, the R being the hot leg of power, C is the side of power that every 24 volt circuit terminates upon to complete the circuit.
Just as a car battery has a Negative post that all 12 volt circuits terminate upon in a car or anything electrical , they all require 2 legs of power, some voltages are only 1 hot leg 230 volts is 2 hot legs but 115 volts and 24 volts which a thermostat controls uses 1 hot leg being the R terminal.
The thermostat has switches internally that connect the hot leg of the 24 volt power to the desired circuit, jump red to white and heat comes on, jump red to green and fan runs, jump red to yellow and the AC unit outside runs. test this out and if it operates then the thermostat is bad assuming it is wired correctly.
SOURCE: No heat, trouble shooting light has continious flash.
There is a vacuum sensor on most units tied from the exhaust gas fan to the sensor. Does the unit try to start? If the unit's exhaust fails to pull the switch it will turn off after about 30-45 sec after starting. "IT" thinks it's not exhausting and stops to keep from overheating. Do you have this exhaust fan and rubber hose to sensor? Can you see if that fan is turning on start?
SOURCE: Goodman GMNT furnace goes into 'lock-out'.
check to see if your intake pipe or vent is clear this could cause a flame jump and make it look like a bad flame sensor let me know if this helps
SOURCE: furnace starts properly, then shuts down, led flashes 8 times
The first thing to look at is the flame sense rod.
Shut off power to the furnace, remove, clean sensor with steel wool or sandpaper then reinstall the sensor. Reapply power and it should run properly.
SOURCE: goodman a/c blower fan will not shut off
Pull the stat off the wall, if the unit fan continues to run then your fan relay is bad or receiving 24vac from another source.
SOURCE: I have a Goodman GMH95/GCH9 furnace, the
open the front door to the furnace to access the controls there should be a red button try pushing it to reset
302 views
Usually answered in minutes!
×