Hi, I've got a goodman furnace (mod. # GHT070-3) it's about 5 years old. Recently, the heat will only kick on for about 30 seconds then shut off. It's giving me 4 flashes: Open limit switch, then it kicks off. After that it gives me 3 flashes and turns back on (pressure switch). It seems the...

What are the normal temperature settings for the fan limit switch on the a/c+gas heater blower unit?

I live in an older trailer but the furnace is about 2 yrs old where is the limit switch located? Every time I use the air conditioner it trips the limit switch how do I fix it without having to call someone and have a pricey bill. :confused: :( :eek:

I have a 30+ year old forced air furnace. Currently, when the thermostat is turned up to call for more heat, the burners ignite normally. When the heat exchanger-HE- gets to temperature (which seems to take a long time) the fan switches on normally. HERE'S WHRE THE PROBLEM STARTS The fan...

Hello Folks, This weekend I've been playing with a heating system at my new apartment and I'm trying to figure out what the different componets do. I kind of followed the circuit but still have some missing links... 1-There are some terminals on the furnace's circuit board labeled LIMIT. The...