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Car Forum / Driving, Maintenance, Tuning / RVs / May 2007furnace question
I have a 2005 10' Jayco that I am having some problems with the furnace not working. When I plug it into 110v it doesn't want to fire up. The fan runs and you can hear it clicking but it doesn't "kick in". If I unplug it and run it just on the 12v battery the fan runs, you can hear it clicking and it does "kick in" and heats up to temp fine. Anybody have any ideas other than "just unplug it". I'm about 150 miles from the dealer and already made two trips with it and it still doesn't work right. > I have a 2005 10' Jayco that I am having some problems with the furnace not > working. When I plug it into 110v it doesn't want to fire up. The fan runs [quoted text clipped - 3 lines] > "just unplug it". I'm about 150 miles from the dealer and already made two > trips with it and it still doesn't work right. It sounds like there is no gas reaching the furnace. Try bleeding the lines by turning the stove on. Make sure the valve on the LP tank is open. Andrew Yep, there's gas. That was my first thought too. So I ran the stove and hot water heater with no problem. I think it's something to do with electrical...controlling the gas valve. > > I have a 2005 10' Jayco that I am having some problems with the furnace not > > working. When I plug it into 110v it doesn't want to fire up. The fan runs [quoted text clipped - 8 lines] > > Andrew > Yep, there's gas. That was my first thought too. So I ran the stove and > hot water heater with no problem. I think it's something to do with > electrical...controlling the gas valve. The truly STRANGE thing is that your furnace WILL work properly (fan AND flame) when DISCONNECTED from shore power (running directly from the battery) but not WHEN connected to shore power (fan only - the burner will not fire). After all, shore power is simply converted to 12V. The furnace operates using 12V ALL the time, either from the battery OR the converter. Please let us know if you find a solution. Good luck!  Signature:) JR > I have a 2005 10' Jayco that I am having some problems with the furnace not > working. When I plug it into 110v it doesn't want to fire up. The fan runs [quoted text clipped - 3 lines] > "just unplug it". I'm about 150 miles from the dealer and already made two > trips with it and it still doesn't work right. Does the fan run faster when running off of the battery than when connected to "shore power" (120VAC)? If yes, you could have a problem with the power converter's output being low. Signature:) JR The blower runs the same if the campers plugged in or if it's unplugged and running off the battery. I'll have to look into the power converter schematic and see what's up there. > > I have a 2005 10' Jayco that I am having some problems with the furnace not > > working. When I plug it into 110v it doesn't want to fire up. The fan runs [quoted text clipped - 10 lines] > :) > JR I seem to remember something about a switch? john ( of course I dream a lot) > The blower runs the same if the campers plugged in or if it's unplugged > and [quoted text clipped - 22 lines] >> :) >> JR > I seem to remember something about a switch? Perhaps you are thinking of an older setup where a selector switch between battery and converter is MANUALLY operated by the occupant. That's a good idea, except that the furnace is getting power in BOTH modes. The problem is that the main burner will not fire while using the converter. I suspect LOW voltage. A common problem for RV furnaces is INSUFFICIENT power (low voltage, usually). The furnace blower will run but not FAST enough to fully close the "sail switch" (a switch that "floats" on the stream of air created by the blower), thereby not allowing the gas to flow. This is a safety feature. A worthwhile endeavor, whether it fixes the problem or not, would be to re-make the connections at - and leading to - the furnace. Signature:) JR > I have a 2005 10' Jayco that I am having some problems with the furnace not > working. When I plug it into 110v it doesn't want to fire up. The fan runs [quoted text clipped - 3 lines] > "just unplug it". I'm about 150 miles from the dealer and already made two > trips with it and it still doesn't work right. This is indeed puzzling, as the furnace runs either off the 12 v battery or off the 12 v from the converter, which converts the 120 VAC to the 12 v DC. I suspect that the converter is messing up somehow. Obviously the furnace is getting power both ways, since the fan runs and the ignitor clicks. The gas valve must not be opening. Maybe it is not getting enough power/voltage from the converter (or possibly too much). I would check out the output of the converter with, at a minimum, a good DC voltmeter. An oscilloscope would be even better, to see how much ripple there is. Most of the rest of the equipment that runs off of the converter does not need to have particularly close tolerances on the voltage or ripple. Lights will light with the voltage too high or too low. Ditto with the water pump if you have one. Most pop-ups come with rather cheaply built converters. High end campers have expensive, and much better and more reliable, converters. If the dealer wants to replace your converter, and if it is not under warranty, let us know here. Dealers usually overcharge for the cheap converters (which are available on the internet very cheap) and for the same dealer price, you could get a much better converter put in which will last years and years. HTH > I have a 2005 10' Jayco that I am having some problems with the furnace not > working. When I plug it into 110v it doesn't want to fire up. The fan runs > and you can hear it clicking but it doesn't "kick in". This rules out the sail switch; the furnace attempts to light with and without shore power. > If I unplug it and > run it just on the 12v battery the fan runs, you can hear it clicking and it > does "kick in" and heats up to temp fine. Anybody have any ideas other than > "just unplug it". I'm about 150 miles from the dealer and already made two > trips with it and it still doesn't work right. Like several others, I immediately suspected the converter. Try this: Turn on all of the camper lights, and have someone else connect and disconnect shore power. The brightness of the lights will change noticeably. If the lights are brighter when connected to shore power, the problem is probably not with the converter. If the lights are brighter when shore power is disconected, the problem is almost certanly with the converter. Brightness (voltage) is not the only possible converter issue, however. For example, it is possible that the converter's filtering circutry has failed and it is delivering very noisy power which some device is having trouble using. Austin |
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