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Old 09-26-2012, 12:48 PM   #15
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If its the relay, where do i get a replacement?
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Old 09-26-2012, 12:51 PM   #16
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Im not real keen on the idea of spending $400 on a heater we may use twice a year. Someone added a vintage cat heater like you mentioned (see my other post). Im not fond of it either.....
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Old 09-26-2012, 01:25 PM   #17
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If you can determine the wires that go to the relay coil, one will be ground and one 12 volts. If you can't see the wire that goes to ground disconnect both wires from the relay that are connected to the coil. Jumper one side of the coil to ground and put 12 volts directly to the coil. It should click and pull in. If it does the fan should come on. If it does not click the coil winding in the relay is open.

If the fan ran when the coil pulled in but will not run when originally connected it looks like the control board is not supplying voltage to the coil.
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Old 09-26-2012, 01:37 PM   #18
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The entire heating unit will slide out of the housing "can", similar to a window ac unit.
You have the front cover off, so just remove any cabinet pieces in the way, and slide the heat exchanger/fan assembly out.

This will allow access to inspect the heat exchanger and all. The furnace can be function tested on your workbench with a LPG source and a good car battery.

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Old 09-26-2012, 02:35 PM   #19
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Where can i get replacement relay for the furnace?
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Old 09-26-2012, 02:38 PM   #20
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I can hear something "click" when I turn on the thermostat, but just sometimes.
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Old 09-26-2012, 02:56 PM   #21
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Did you test the relay as noted above?

Don't replace it till you know if it is bad or not.

If you need a relay any auto parts shop will have a standard 30 amp relay for less than $10.00. That relay will have both normally open and normally closed contacts so make sure you wire it using the normally open set.
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Old 09-26-2012, 04:18 PM   #22
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relay

I think this is the thing thats causing my issues, the fan red/white wires run to it. If i wire the red/white fan wire directly to 12 volt the fan will kick on an operate even after i diconnect the direct hot wire.
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Old 09-26-2012, 04:38 PM   #23
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If i turn the thermostat to a higher temp than in the trailer (on), the heater fan should come ON correct?
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Old 09-26-2012, 05:26 PM   #24
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With out a diagram it is hard to envision what is happening.

There might be a second relay that is powered once the sail switch closes as the fan comes up to speed. That may be why the fan run even after you disconnect the 12 volts.

See if you can get a diagram from the manufacture or get someone to post a diagram one. Armed with that we may be able to figure things out.
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Old 09-26-2012, 05:31 PM   #25
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Forget that POS. That dam fan kicked on when I hit the pilot light switch a few minutes ago.

IT EXPLODED, a piece blew off & hit me in the arm, i now have a bruise on my left arm, im covered in black soot & the noise is still ringing in my ears. Someone said it might blow up. Electric heater for me!! (we have an electric hotwater heater anyway).
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Old 09-26-2012, 06:23 PM   #26
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Originally Posted by HowieE View Post
If the fan ran when the coil pulled in but will not run when originally connected it looks like the control board is not supplying voltage to the coil.
I'm only 99 percent sure but I think a 73 does not have a control board.
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Old 09-26-2012, 06:48 PM   #27
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Forget that POS. That dam fan kicked on when I hit the pilot light switch a few minutes ago.

IT EXPLODED, a piece blew off & hit me in the arm, i now have a bruise on my left arm, im covered in black soot & the noise is still ringing in my ears. Someone said it might blow up. Electric heater for me!! (we have an electric hotwater heater anyway).
I agree with your sentiment about the 40-year-old furnace, it's scrap. That doesn't mean that going all-electric is necessarily the best choice. It's hard to beat the amount of heat you can get from propane, and the modern ones are vastly better. If you're always going to be plugged in and rarely using it in seriously cold temperatures, you can get away with electric heat, but keep in mind you've only 30 amps to work with, and you already have an electric water heater and are in Maine. 2 electric space heaters running concurrently will pull 25 amps on high (assuming normal 1500w units.)
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Old 09-26-2012, 06:57 PM   #28
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<snip>

At least if you replace the furnace, you will have peace of mind for many years to come.

Andy
Good advise . . .


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