2 year unit blow heat for about 2 minutes then shuts off
The weather king gas furnace is only 2 years old and has been nothing but one problem after another. In the 2 winters that I have owned the unit it has needed repairs. The most recent problem which is right now has lead me to replace the limit switch, gas value transformer and the control board. Nothing seem to work. The point of replacing my other old weather king with a new one was to avoid this headache. Are any of these parts cover? What is covered with unit? PLEASE HELP!!!
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If it is an electric furnace, the heat sequencers usually take 45 seconds to possibly 1 1/2 minutes to fully stage on. This depends on how many elements you have. Of course, once they stage on, one or more elements COULD be burnt out.
If its a gas furnace over ten/twelve years old, the thermally activated control should start the blower at approximately 140 degrees. That usually occurs within one or two minutes of main gas opening.
If its a gas furnace that's relatively new, the blower comes on through a circuit board after a call for heat is initiated and could run and blow cold air even if the main gas flame is in flame failure.
Quick call the installer to see if it is still under warranty. There is something wrong if the motor is being replaced every other year. Most of the motors should be lubed with fan turbine oil and not 3 in 1, nor detergent containing oils. If the wrong oil is used, the bearings will go south in 1 to 2 years.
When you remove the panel to the unit it turns off the power to it. The reinstalling the panel will reconnect power and allow the unit to reset. So the cheapest and easiest thing you can try is to replace the thermostat. Make sure you see how many wires you have connected to your existing tstat and buy near the same thing. It's possible that the tstat is acting up, not allowing the unit to cool when the temp demands. And turning off power is resetting the tstat as well as the unit. It will be hard to troubleshoot with the info provided so a new tstat will be worth a shot. Hope this helps!
Wow, about the only thing you have not looked at is the thermostat. Have you had the gas pressure tested? Next time it quits, Ohm out the gas valve to see if it has a bad coil. I have in the past put on the gas valve one of thoes light probes and had to watch it to see when power went out. I found out it was a bad circuit board. Hope this helps.
You probably have a shorted wire between the heater and the a/c. There are two wires that conncet the control power to the outdoor a/c from the heater they should be on terminal c & y in the heater. disconect those two wires and try it again if the fuse doesnt blow you have a short in the wire between the a/c & heater
if your furnace is on 24 hours straight, before it heats up your home, then either your cold weather and indoor temps are extreme, or your unit is grossly undersized. if however your furnace cycles on and off when the temp is still way colder than you have set it you have either a bad stat that thinks its hotter than it is, or a bad furnace problem and even though the furnace is getting a signal from the stat to heat it is failing to do so. you'll have to watch and think this through to isolate the problem. if you set the furnace to max heat and it runs and heats the house reasonably quick then its probably going to be a bad stat. if you set it to max heat and it shuts off way before it gets to setpoint then the problem is in the furnace. be sure filters are clean, blower wheel is clean , returns are no obstructed, etc. if you by chance have an old mercury bulb stat they had a thing in them called a heat anticipator which basically worked like this. a dial with a little pointer determined how soon it would be till the furnaced reached the desired temp and anticipated how soon to shut off the burners in anticipation of the cool down period so you dont overshoot the desired temp. if these are bad or moved to different setting they can short cycle the furnace on of on off etc. or shut down the burner almost as soon as it lights. setting is usually at .4 to .6 on most, but really a digital stat is only way to go. by the way check to be sure you don't have a hot air supply grill blowing directly on the stat or it will shut off as soon as stat gets hot and rest of house will be cold. usual location is 5 feet off floor directly over the main return air grill or under it as the case may be. good luck