Burners wont light but the pilot light is on and fan works
Mots the t stat or gas valve check connections first most likely it's the gas valve cause the furnace is old valve is stuck cannot open
SOURCE: Cozy wall furnace burner will not light. Pilot
Hi, have done this to many times not to know. I will walk you through this. It is good that the pilot is lit. Go to the stat and remove cover. Don't worry as this is a milivolt unit, no voltage or such a small amount you wont even notice as this is why it is called milivolts.Take a small screw driver to remove the next section which is the thermostat and will expose the sub-base where you will find 2 wires connected to it. You may have 2 or 3 screws to take loose to get to this last section. Anyway, if you have a piece of insulated wire laying around, even old speaker wire will work, take it and touch the wire across the 2 terminals and hold. If the furnace comes on, the thermostat is faulty, and you will need to buy a new one. No power to shut down, and simple to change. Cost about $12.00 dollars. Try and get a heat only milivolt stat as they are much less expensive and will have less problems with them. Go to home DEPOT to get one, or O.C.S.H. will also carry them. Don't let the salesman talk you into buying a programable heat and cool stat, 24 volts as they will work, but cost more and you don't need it!! Look around even if you need to go to a wholesale Refrigeration, Air Conditioning, and Heating parts house. Tell them you need one for a unit in some apts you own, and you will pay cash as you want a cash account. They will only ask what job its for, and just tell them your name. This is not illegal and I wouldnt tell you this if it was!! You will still have to pay taxes but will get a wholesale price for it. I am sure it will fire up when you touch the 2 wires and prove stat is bad. For some reason it is not the stat, follow the 2 wires from the stat down to gas valve and jump the same 2 terminals there also. If it fires up, you will have a problem in the wires from the stat to heater and will need to be replaced. I don't think this is the case. But, on the chance it will not fire after you have done all of the steps I have had you do, then you have a faulty main gas valve(MGV) and will need to replace. This is all easy to repair.I am a 100% sure it will fire up when you jump the 2 wires together, and you will need the stat. Please let me know as I will be waiting for an update! Good Luck,
Shastalaker7
PS When you install the new stat, make sure it is Level.
SOURCE: older heater, late-60's gas in mobile home. When
Check your exhaust pipe for blockage, Make sure pilot light is located just above or below the burner. Make sure that there is a good supply of air going to the burner and that the intake pipe (if it has one) is not restricted. A furnace that old needs to be replaced what ever you find. You could have a cracked heat exchanger.
SOURCE: Noisy pilot light Vulcan Quasar 40
Simply clean out the jet tube with a fine wire, the sound you hear is the gas blowing by the irregular edges, and swirling and not mixing and producing sound waves, (Bit like a flute) So, you need to clean the tube right out, and smooth off the end again, & sorta "Countersink", Flame the end too, at the end.use a very fine needle file, and make it look like new, that will sort your problem out. Then adjust so you have a good gas flow. Also check out it isn't blocked too.
SOURCE: Pilot lights fine, furnace fires up, when it turns off the pilot goes out
need to have at least 3 feet of vent out of the roof, if it is to low the coll air will cold soak down to the pilot and shut it down.
SOURCE: cozy floor furnace the pilot light, lights ok but
http://arnoldservice.com/Troubleshooting_Heating_Problems.htm
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