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New furnace problems [message #69204]

Fri, 01 January 2010 11:11

lance

Messages: 190
Registered: December 2004
Location: Vancouver, WA

Karma: 0

Senior Member

My new Suburban SF 35 worked fine for a week but new blows cold. It's been down around freezing for a while but the furnace has kept me wam although it runs most of the time. The thermostat is also maxed out. Yesterday it felt a bit cold so I turned the thermostat down then up again and the furnce came on. I had to do this several times. Now the fan runs but no heat. There is no troubleshooting info in the literature that came with it. Anyone know what the deal is? I have 13 volts at the furnace and plenty propane.

1974 Palm Beach

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Re: New furnace problems [message #69205 is a reply to message #69204]

Fri, 01 January 2010 11:22

jwillard

Messages: 118
Registered: May 2004
Location: Silver City, NM

Karma: 0

Senior Member

I replied off line and sent you a PDF with some service info on Suburban furnaces

Jeff Willard
Silver City, NM
1973 ex-Glacier

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Re: [GMCnet] New furnace problems [message #69214 is a reply to message #69204]

Fri, 01 January 2010 13:14

John Wright

Messages: 118
Registered: September 2008

Karma: 0

Senior Member

Lance,
You need to separate two possible issues here, by that I mean the thermostat
and the furnace.

The thermostat is a on/off set point device with some dead band. Turning up
the set point to higher temperature than you need to feel comfortable will
not get it any hotter quicker than setting it to the temp you want. Which
style thermostat do you have. One of the analog where you set the
temperature with a lever or a battery powered digital where you set the temp
by pushing a up or down button to set the desired temperature? I would
suggest replacing the batteries if you have the second style.

As for the SF-35 furnace here is a link to the SF Series Service Manual.

http://www.bdub.net/manuals/Suburban_SF_Series_Service.pdf

Are you sure that you actually have propane in the tank. Does your stove
still work?
Furnaces are a gas hog when it comes to emptying the tank in the GMC and can
do it in week if as you say it has been running all the time. The LP tank
only holds 62 pounds when full. I only got 7 or 8 days the last time I tried
to heat on LP only. I heat the coach with 2 1500W cube heaters when parked
and hitched to shore power. I can keep the coach at about 63 deg with one
as I work on it in the barn doing upgrades.

J.R. Wright

On Fri, Jan 1, 2010 at 12:11 PM, Lance <lance@vonprum.com> wrote:

>
>
> My new Suburban SF 35 worked fine for a week but new blows cold. It's been
> down around freezing for a while but the furnace has kept me wam although it
> runs most of the time. The thermostat is also maxed out. Yesterday it felt a
> bit cold so I turned the thermostat down then up again and the furnce came
> on. I had to do this several times. Now the fan runs but no heat. There is
> no troubleshooting info in the literature that came with it. Anyone know
> what the deal is? I have 13 volts at the furnace and plenty propane.
> --
> 1976 Palm Beach
>
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Re: New furnace problems [message #69221 is a reply to message #69204]

Fri, 01 January 2010 14:25

lance

Messages: 190
Registered: December 2004
Location: Vancouver, WA

Karma: 0

Senior Member

Thanks fellas. It was the thermostat. $13.00 got me going again. We'll see what crops up next.

1974 Palm Beach

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Re: New furnace problems [message #69229 is a reply to message #69221]

Fri, 01 January 2010 15:45

WD0AFQ

Messages: 7111
Registered: November 2004
Location: Dexter, Mo.

Karma: 207

Senior Member

Oh good. I was thinking like JR, gas not getting to it. We put a new one in 2 years ago, sf 30 I think. Has worked flawlessly. I did put a new thermostat on it just because it looked better on the wall and was only 20 bux. We find ourselves using the Wave 6 catalytic heater most of the time because it uses so much less fuel.
Dan

3 In Stainless Exhaust Headers One Ton All Discs/Reaction Arm 355 FD/Quad Bag/Alum Radiator Manny Tran/New eng. Holley EFI/10 Tire Air Monitoring System Solarized Coach/Upgraded Windows Satelite TV/On Demand Hot Water/3Way Refer

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