propane furnace help

[themajor*hole]

our lake house has a furnace in the garage and we are trying to get the heat going to work on my dads new project, a 1964.5 mustang convertible.

the last time we used the furnace was about 10 years ago, maybe more.

it worked fine then, no problems at all.

yesterday we tried again, and the fan wont turn on. ive allready eliminated the thermostat as a problem.

its a furnace only unit, and has the gas & power off since the last time we used it. i dont think the fan could just go bad for no reason, but you guys know more than i. im also thinking it could be the capacitor, if they make rectangle shaped capacitors. ive only seen round beofore, but like i said, you guys know more than i.

also, does the capacitor(if thats what it is) need to be re-charged or something after sitting un-powered for so long?

oh and the burner kicks on too

thanks for any help

[jb8103]

Make sure the power is off before you try this: can you turn the fan by hand?

[themajor*hole]

yup, it turns freely

[RegUS_PatOff]

could be the capacitor, if they make rectangle shaped capacitors.

pictures ?

furnace model number ?

[themajor*hole]

i dont have any picures yet, and i forgot to get the model number.... i know its pretty old tho, at least 20 years

i should be going back up tomorrow, i will get the number and take pics

thanks

[applianceman18007260692]

How long did you wait for the fan to come on? The plenum has to heat up to 110 degrees before the fan kicks in and if it don't then usually a limit shuts down the gas. Is this the case with yours?

[themajor*hole]

it never cut the gas on its own, we had it run for about 3-4 min before shutting it off

[ACtechGUY]

If the burners were firing for 4 minutes and you did not get fan or the burners did not shut off on their own , you likely have a failed combination fan limit switch.

it may look like this My link

or something like this My link

[themajor*hole]

If the burners were firing for 4 minutes and you did not get fan or the burners did not shut off on their own , you likely have a failed combination fan limit switch.

it may look like this My link

or something like this My link

well my dad had the local repair man there and it turns out we didn't leave it on long enough. Fan kicked on after 10 min.

[Budget Appliance Repair]

10 minutes before the fan kicks in seems pretty excessive to me. Generally speaking the heating chamber should be hot enough to kick on the blower fan within 5 minutes at the most usually, (I would say usually 2-3 minutes it should be hot enough).

Maybe burner orifices partially plugged or something cutting down the btu's of the burners?

Especially if you remember the operation of the furnace from 10 years ago and it never took that long for the fan to come on before. Maybe the fan limit switch is failing and not reading the temp correctly so taking to long to turn on blower fan.