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05 /10/ 24, 8:01pm

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Subject: LP Furnace Author: Elmer Aydelotte [ Next Thread | Previous Thread | Next Message | Previous Message ] Date Posted: 11/ 16/ 01, 7:03pm Can anyone give me info on the LP furnaces. All three on my 1986 PT 38 do not work. Have looked at the furnace wiring and it shows 4 wires to each furnace. One 12V+ and one 12V- and 2 thermostat wires. On mine there is 4 wires comming out from the furnace but only 3 are hooked up and the 4th stat feed wire can not be found. The three feeds are 1 12V+ and 1 12V- and the other one I assume is a stat wire, but I can not find the 2nd stat wire. Looked at the stat and it has 2 wires connected to it. If I short the 2 stat wires comming out of the furnace it lites and works OK. [ Next Thread | Previous Thread | Next Message | Previous Message ]

Replies:

[> Subject: Re: LP Furnace Author: Jim Scoggins [ Edit | View ] Date Posted: 11/ 17/ 01, 4:32am it's odd that all three don't work double check the basics be sure the LP switch on the dash is turned on turn on the thermostats and set the heat fairly high you may have to cycle them 4-5 times before they will work [ Post a Reply to This Message ]

[> Subject: Re: LP Furnace Author: Bob Dilks [ Edit | View ] Date Posted: 11/ 17/ 01, 7:07am You have to find the other thermostat wire.or improvise. Suburban supplied four wires out of the insulated furnance controls as follows: red positive power supply, yellow negative ground and two blue wires for thermostat use. Blue Bird supplied wires to the furnance as follows: red positive power supply, yellow negative ground, red from the thermostat to one blue wire to carry the thermostat signal and one brown connected to the other blue wire to ground the thermostat signal. If you improvise and ground the free blue wire exiting from the furnance, the furnance should operate normally in response to the opening and closing of the thermostat. Blue Bird wired the thermostats as follows: black power supply positive to the upper right hand connector (as viewed from the front) and red power supply positive from the lower left hand connector to one of the furnance blue thermostat wires. Its hard to believe that the negative thermostat ground wires were omitted to all three furnances as coincidence. The wires supplied by Blue Bird were covered in a braded sheath and wrapped at the sheath end with black electrical tape. Unwrap the tape and check in the sheath for the missing wire. Please do not rely on the wire color coding shown above as assembly line workers often expressed their individualism. Call me at 580/564-3517 if you need more info. Bob Dilks [ Post a Reply to This Message ]

[> Subject: Re: LP Furnace Author: HR Skilllern [ Edit | View ] Date Posted: 11/ 21/ 01, 6:26pm Hi, It is improbable that all three of your heaters are inop. More likely, it's something very simple. First, check that you have propane in your tank. Check the direct reading gauge on the tank itself. Ascertain that the propane main valve on the tank itself is open. Then, make sure to check that the propane cut-off switch is "on"---should be a small panel with a red light, green light and pushbutton located in the kitchen area near the floor, possibly under the dinette. You can then try to light your range to make sure you are getting gas inside the coach. It takes a while for the propane to work its way up to the burner, so run the thermostat switch up to max heat and back to off several times. I lit my heaters for the first time this season yesterday and it took about 4 or 5 cycles to get them cooking. They are fine now. [ Post a Reply to This Message ]