Furnace only works when resetting fuse
Good evening.... On our family camping trip this past weekend, it was cool enough to use the heat. I could turn the heat on, set the thermostat, and the blower would spin up followed by nice toast...
Forum Discussion
Golden_HVAC wrote:
My guess is that you might find it is reaching over 150F air output, and locking out. Did you have a chance to check the temp of the air yet?
Higher than normal air temps can be caused by a bocked vent, or near the furnace if the hot air is leaking into the cabinet that the furnace is located in, then the air returning to the furnace might be say 95F on average rather than a normal 60 - 70F. I had to seal one of my supply air ducts that was leaking hot air near the furnace, and also installed some reflex insulation around the hot air chamber, to prevent so much heat from gettting back into the return air and fan intake.
Cooler air into the furnace supply air fan means cooler output air, and thus will run longer without going into lockout. Also if the furnace has only 3 ducts, say 4" ductwork each, that might be barely enough air flow, 4 or 5 ducts might flow a lot more air, and the output air will be in the normal 120 - 140F range, the thing will stop locking out.
Good luck,
Fred.
I'm fairly certain you're on to something here. I don't have a quick-read thermometer so was forced to use my grill meat thermometer....so it took a while for the temps to settle....but here is what I recorded this morning. Everything is degrees F
Inside RV temp was 66 degrees before turning the heat on. I turned on the heat and then let it run for a while...then recorded these temps:
Living room vent (which is about 16 inches from the return) = 178
Master BR vent which is about 13 feet from return = 109
Bunkhouse vent which is 14' from return = 118
Return temp = 108
Air flow at the vent closest to the blower is very strong -- as I would expect -- with less flow at other vents, but still seems like adequate air flow everywhere. However, I've never owned an RV with ducted heat so I really don't have a reference. But I can't see how it was a good idea to put a vent a mere 16" from the return. I would think the return is pulling in some of that air coming right out of the vent and is the reason for the high return temps and causing the overheat/lockout to occur?
