I have a forced air Weatherking. When I set the thermostat to activate the furnace, the ignitor will begin to glow, after about 10-15 seconds, you can hear the gas kick on. The gas ignites and everything functions as normal. After about 10 seconds the flames shut off, and the furnace tries to ignite again. It will keep doing this cycle for 2 or 3 or 10 attempts, then it will finally fire and stay on. Furnace will run to heat house to desired temp. Just randomly shuts off during start up. Like I said eventually it will stay lit and heat the house. Does anyone have a solution?
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Turn off power to furnace and remove upper panel only. Turn the power back on and turn the thermostat all the way up. Go back down to furnace and watch the burner section.
This is what you should look for 1)On the left hand side of the furnace near the burner, the igniter should glow red, if it glows red and shuts off without igniting the burner then you have a problem with the venting or faulty pressure switch.
2) If it does not glow red but you have power to the furnace, the ignitier is most likely cracked.
It sounds like you're describing one of two things. The hot surface ignitor in a gas-fired furnace, or the resistive heat strips in an electric furnace.
The hot surface ignitor in a gas-fired furnace lights the burners. This ignitor in modern furnaces serves the same purpose as the standing pilot flame did in older furnaces. It provides the required heat to ignite the gas at the burners. Without an ignition source, a gas-fired furnace cannot provide heat. When the ignitor is activated it will glow bright orange or yellow.
The resistive heat strips in an electric furnace actually provide the heat to a home or building. When the furnace turns on, the heat strips are activated and usually glow orange when they reach peak temperature. In almost all cases, the heat strips are not easily seen or accessed without removing covers or panels inside the furnace.
yes you can unplug furnace for about 20 seconds and replug then start up unit... a common problem with alot of furnaces this time of year is the hot surface ignitor fails which is the glow plug on the unit .. the unit when called for heat should start a small motor with a wheel on it known as the enducer draft motor then activates the round switch with the plastic hose connected to it...make sure the hose is not kinked or obstructed...pull the end off opposite of the round switch if you **** on the hose should here a clicking sound.. reconnect after the switch has closed then the power is sent over to a ignitor on most furnaces some have spark ignition but either way that is the next step after the ignitor glows red hot then the gas valve should open and fire off ..after it lites there is a flame sensor a metal rod that is in the direct path of the flame that measures current and keeps gas valve open once unit reaches temperature a limit will activate the blower to come on....where does it fail ... most units with a led code will have a sticker attached to the door outer or inner door with code meaning... count the flashes and then look for code...hope this helps out
if your power vent moter is not running you should not have have glowing ignitor.Frist the vent moter must close an air prove switch in series with the idnitor .seems you have a stuck air prove switch.Its the one with a hose attached
You may have a dirty flame sensor. There are a number of other possible causes as well. Rheem/Ruud/Weatherking furnaces also have problems with the connection on the blower deck.
The flame sensor sometimes must be bypassed around the MOLEX CONNECTOR in the deck due to humidity.
Hope this helps.
Try cleaning the flame sensor. It is located right besides the last burner. Looks like a thick piece of wire. Take steel wool and gently remove the carbon that has built up. Should only take 4 or 5 strokes. Let me know how it goes after that. ken
turn off power to furnace and open the front panel and see if you can see burners and gas valve and Hot surface ignitor. If you can. turn furnace on and watch to see if the ignitor glows. Let me know what you find. If it doesn't glow you probably have a faulty Hot surface ignitor. If I had make and model number I should be able to find the part
I have a thermostat 9600 Robertshaw and I have to use the trip switch to start my furnace. Then it reaches the temperature and sometimes it will kick in by itself but majority of the time I have to trip it. I have changed the batteries cleaned the thermostat,and reset it. Is it time for a new thermostat and can I replace it myself. Thanks