Suburban furnace

JudyT

Member
I have a 2011 BC 3355RL with a suburban furnace model SF35. When it kicks on it roars like a jet engine. Is anyone else having this experience? I have never had a furnace make this sound in any other coach I have owned.
 

danemayer

Well-known member
If the roaring is coming from the A/C unit's blower which is on the ceiling, you have the fan setting on the thermostat set to "HIGH."

Change the thermostat mode from "FURNACE" to "FAN" and then press the + or - button on the right side of the thermostat to change the fan setting from "HIGH" to "AUTO". Then switch the thermostat back to "FURNACE" mode.
 

traveler44

Well-known member
I think that was a very good description of the problem. If they have a mobile repair service near you maybe they could look at it and diagnose the problem but you would have to call Heartland to okay a fix under warranty. If the roaring starts when the furnace ignites I would be calling Heartland and Suburban to get somebody to look at it for sure.
 

danemayer

Well-known member
I just read the following in a Suburban manual:

BURNER ADJUSTMENT
To adjust primary air to the main burner, the
small sheet metal cover found just below and to
the right of the lighter opening must be removed .
Behind the cover is a slotted screwhead . With a
screwdriver, turn screwhead counterclockwise
for less primary air and clockwise for more primary
air . A symptom of too much primary air will
be a howling or screeching noise when the burner
is on (reduce air to correct) .
A symptom of too
little primary air will be sooting on the exterior
vent and a distinct yellow and floating flame
(increase air to correct) . A hard blue flame is
the sign of correct adjustment . NOTE : If a sooting
condition cannot be corrected by the air adjustment
on the burner, discontinue use of furnace
until problem can be corrected by a service
agency .
 
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