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Car Forum / Driving, Maintenance, Tuning / RVs / May 2007Furnace
I bought an 87 Corsair 29' Travel Trailer. At first the furnace would not turn on from the thermostat at all. I removed the table seat and saw the electrical connector was unplugged. I plugged it in and the blower kicked on but the burners would not ignite. I assume there is no pilot since it has igniters which do spark. I can hear and see then trying to ignite. What would cause this to not fire? Propane tank is full and the stove and lp fridge works. Any advice at this point would be great! Thanks I assume that you are holding the pilot button down when you are sparking. >I bought an 87 Corsair 29' Travel Trailer. At first the furnace would not >turn on from the thermostat at all. I removed the table seat and saw the [quoted text clipped - 3 lines] >What would cause this to not fire? Propane tank is full and the stove and >lp fridge works. Any advice at this point would be great! Thanks > I assume that you are holding the pilot button down when you are > sparking Since there is no pilot, there is no pilot button. The button you speak of is only present on a unit that has a pilot flame. Self, or electric ignition, has no pilot.  SignatureFrank Tabor Q: Why do the police always travel in threes? A: One to do the reading, one to do the writing, and the other keeps an eye on the two intellectuals. 'I can hear and see then trying to ignite. What would cause this to not fire? Propane tank is full and the stove and lp fridge works.' REPLY: Possibilities : 1. There is alot of air in the line that needs to be purged out before the propane will start going into the furnace for ignition. 2. There could be rust and/or water in the line if it is an old RV . 3. Gas valve may be bad . 4. Limit switch may be bad and not allowing electricity to go thru it which is necessary before ignition will occur. 5. Burner orifice or pilot orifice may have dirt in it thereby not allowing propane to go thru for ignition. 6. There may be a manual shutoff valve in the line which is in the closed position. 7. The line that runs to the furnace underneath the RV may be pinched . It is generally a good idea to take the RV in for qualified service to be performed if the furnace will not start after a few attempts. Do I need to have 12V supply? I'm not sure the battery is any good. I do have 110V plugged in. >I bought an 87 Corsair 29' Travel Trailer. At first the furnace would not >turn on from the thermostat at all. I removed the table seat and saw the [quoted text clipped - 3 lines] >What would cause this to not fire? Propane tank is full and the stove and >lp fridge works. Any advice at this point would be great! Thanks >Do I need to have 12V supply? I'm not sure the battery is any good. I do >have 110V plugged in. Well . . . yah. Furnace, fridge, or whatever; they all need a 12VDC supply to run the electronics. >>Do I need to have 12V supply? I'm not sure the battery is any good. I do >>have 110V plugged in. > >Well . . . yah. >Furnace, fridge, or whatever; they all need a 12VDC supply to run the >electronics. Partly right. The furnace blower runs on 12v, but my refrigerator has no "electronics" that require 12v. The refrigerator will run on 110v or LP gas with no 12v power. Even so, shouldn't a furnace motor run if the converter is working -- even if the battery's no good? GB in NC > Even so, shouldn't a furnace motor run if the converter is working -- > even if the battery's no good? Yes. Signature:) JR >> Do I need to have 12V supply? I'm not sure the battery is >> any good. I do have 110V plugged in. > Well . . . yah. > > Furnace, fridge, or whatever; they all need a 12VDC > supply to run the electronics. The furnace operates on 12V, whether it is supplied from the "house battery" or power converter. With *NO* battery installed (keep the dangling lead ends insulated from anything else they might touch), ensure the furnace is getting power from the converter. FWIW, my 2000 Dometic 2-way fridge has a "limp home" or "dumb" mode that allows it to operate on LP without external electrical power. I expect that would be common by now. A furnace is an entirely different critter: It most certainly DOES need proper and adequate 12V power before it will even TRY to burn gas. Signature:) JR > Do I need to have 12V supply? I'm not sure the battery is any good. I do > have 110V plugged in. [quoted text clipped - 6 lines] >> What would cause this to not fire? Propane tank is full and the stove and >> lp fridge works. Any advice at this point would be great! Thanks Tiny insects have a love for the smell of propane. They can and do get inside the furnace and some can even get into the jet. They die and plug up the jet and furnace will not light. Have had to pull my furnace a couple times in last 3-4 yrs to clean out the jet. Not a fun job as furnace had to be partially disassembled to get access to the jet. I now tape over the furnace ports on the outside of the rig except when rig is in use. Mickey >I bought an 87 Corsair 29' Travel Trailer. At first the furnace would not >turn on from the thermostat at all. I removed the table seat and saw the [quoted text clipped - 3 lines] >What would cause this to not fire? Propane tank is full and the stove and >lp fridge works. Any advice at this point would be great! Thanks Look for the little push button with the "S" on it. Press that before starting, it allows the gas flow to start. The button is behind the gas solenoid. >>I bought an 87 Corsair 29' Travel Trailer. At first the furnace would >>not turn on from the thermostat at all. I removed the table seat and [quoted text clipped - 8 lines] > starting, it allows the gas flow to start. The button is behind the gas > solenoid. There is no such button on an electric igniter. SignatureFrank Tabor Your mode of life will be changed for the better because of new developments. I am guessing it has the power it needs since the blower does come on and the igniters do spark. It just won't light. It is getting gas up to the valve that is on the furnace itself. When I press the valve in (To purge air, I assume) I here the gas and smell it. So I am also getting gas to the furnace. I am going to try some of the suggestions posted from Dave related to gas blockage within the furnace. >>>I bought an 87 Corsair 29' Travel Trailer. At first the furnace would >>>not turn on from the thermostat at all. I removed the table seat and [quoted text clipped - 10 lines] > > There is no such button on an electric igniter. I had same problem. Does your stove light? I had rust debris chips in the gas line at the furnace. Blew out lines, after they all were disconnected with compressed air. The propane condenses, and somehow moisture must have gotten in there to allow the rust to form. Signatureplease reply to bargerw NO @ SPAM bellsouth.net and remove the NOSPAM >I bought an 87 Corsair 29' Travel Trailer. At first the furnace would not >turn on from the thermostat at all. I removed the table seat and saw the [quoted text clipped - 3 lines] >What would cause this to not fire? Propane tank is full and the stove and >lp fridge works. Any advice at this point would be great! Thanks |
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