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Old 11-30-2013, 07:54 AM   #1
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2014 328TS furnace noise

First trip in colder weather and furnace used for first time. First night no problems. However, last night when the furnace is running in the bedroom/back of the rig, it started to get really noisy. Not blower noise, it sounds slightly high pitch humming. Checked the vents, no obstructions, good flow with hot air. Can't really tell where the noise was coming from.

I'm not sure where to start looking. Where is motor? Didn't go outside but will this morning. Will check outside and listen for noise. Any help? Front furnace doesn't seem to be making the noise.
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Old 11-30-2013, 10:42 AM   #2
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You can kinda hear the hum/noise outside. Checked the vents outside, no obstructions and all clear in there.
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Old 11-30-2013, 11:09 AM   #3
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My guess would be the gas valve for the furnace. It is a solenoid action type valve. One way to check if it is the gas valve is to monitor if the noise is still there after the burner shuts off but the blower is still running for the cool-down. If the noise still occurs with the blower running it could be a issue with the blower motor itself.

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Old 11-30-2013, 11:14 AM   #4
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I'm not sure how to check this. Haven't opened the grate to the furnace yet. Everything looks perfectly new and no damage. Usually when the furnace shuts off everything goes off.
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Old 11-30-2013, 11:25 AM   #5
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While the furnace is running and putting out good heat turn the switch on the thermostat to off the flame will be shut off but the fan will continue to run to cool the furnace down before it will shut down completely down.
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Old 11-30-2013, 11:30 AM   #6
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So, the "everything goes off" could mean it still might be the blower. The gas solenoid valve is within the furnace unit. They generally don't make noise but if the coil came loose it could make a humming noise. I forgot to mention a fan relay which also has a magnetic coil. At this level it has to be checked by a RV service technician. Not much user serviceable stuff for the furnace.
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Old 11-30-2013, 11:31 AM   #7
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I'm not sure where to access the furnace. Is it outside? Turned on the furnace again in the back of the rig and definitely a squeal/hum noise and it is rather loud (in my opinion). Have the front furnace on now and all you hear is the blower noise which is what you expect. Guess I'll be taking the MH home in once we get home and have it checked out. Would like to try and fix the problem now, but not sure if it's something that can be done DIY?
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Old 11-30-2013, 11:32 AM   #8
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Quote:
Originally Posted by bgilly View Post
So, the "everything goes off" could mean it still might be the blower. The gas solenoid valve is within the furnace unit. They generally don't make noise but if the coil came loose it could make a humming noise. I forgot to mention a fan relay which also has a magnetic coil. At this level it has to be checked by a RV service technician. Not much user serviceable stuff for the furnace.
Thanks, I was thinking that I may need to leave it to the professionals at this point. We brought a electric heater with us, but it's broken! LOL! We'll just use the furnace in the front of the rig tonight.
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Old 11-30-2013, 10:25 PM   #9
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Unless it's brutally cold outside you should be able to keep the coach comfortable with one furnace.
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Old 01-02-2014, 12:57 PM   #10
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Just an update: MH has been at the RV service center for over 2 weeks. They are telling me there is nothing wrong with furnace and the "noise" that I hear it completely normal. I am telling them there is a distinct difference with noise coming from front furnace and rear furnace. Front furnace is loud but has a air blowing noise. Rear furnace has air blowing AND a high pitch whine. The service guys are saying that is normal.

Has anyone else heard a difference in their MHs? Can't figure out what to do. Going to pick up tomorrow and well, I guess we'll have to put up with the loud whining noise in the rear where we sleep at night during winter/cold use. More concerned it is actually a problem they are not addressing.
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