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Old 04-24-2021, 08:38 AM   #1
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357MDOK furnace not keeping up

Hello, new poster here.

we just got a 2021 357mdok after having a 2020 HT30.5mbok.

our new 357 the furnace does not seem to have enough heat.

yesterday 1:00 pm, 30 degrees out. turn heat on to 70. 5:00pm 56 degrees in camper only.

turn elec fireplace on for couple hours, gets to 66 degrees. wake up at 2:00am, down to 57 degrees in camper. turn fireplace on for four hour timer, 64 degrees at 6:30 am. (20 degrees outside, no wind).

furnace seems to cycle the burner, always "warm" air out of the vents, seems like could be more airflow but its not terrible....tried switching propane tank to other and no difference...


i cant find any other complaints online.... any ideas appreciated!
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Old 04-24-2021, 08:44 AM   #2
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Could be a faulty high temp switch that is shutting the burner off or low air flow causing an over temp situation which will do the same thing. I'd pull the access panel and check for issues with the flexible duct.
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Old 04-24-2021, 10:03 AM   #3
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I did check flex ducts and nothing kinked or blocked that I could find behind access panel.
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Old 04-24-2021, 11:21 AM   #4
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Make sure a duct isn't pointed at the thermostat.

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Old 04-24-2021, 12:03 PM   #5
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I have bmpro control panel. Where would the actual thermostat be ? I’m assuming that’s what’s giving the actual air temp on control panel of the 55-65 degree readings I have on the bmpro panel and on my phone app. and I have the set point at 70 degrees so I’m not getting to my set point for some reason.
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Old 04-24-2021, 12:39 PM   #6
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I would also confirm that the cold air return vent and/or associated filter isn't compromised.

Bob
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Old 04-25-2021, 10:42 AM   #7
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Yesterday during the day we had the camper up to 68. Held ok during warm part of day and in sun. (48 degrees for a high ).

Got down to 30 overnight for a low and camper was down to 59 degrees. No wind. Did not use electric fireplace. Furnace “ran” all night. Could hear burner kick in but was hard to hear it kick off so couldn’t time it.

I would think the furnace should do more than 29 degree temp differential ...????
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Old 04-25-2021, 10:59 AM   #8
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Yes it should keep it at the set temp. Something is wrong somewhere.
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Old 04-25-2021, 11:11 AM   #9
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Perhaps I'm wrong, but I think it's odd the furnace would cycle at all when it isn't even close to the set temperature. It sounds like some sort of air blockage is causing it to overheat, thus causing the cycling. Or perhaps there is something wrong with the fan like a bent or loose blade?

Also, be sure the combustion air vent to the outside is not blocked.
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Old 04-25-2021, 05:09 PM   #10
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I agree. I’m not sure if cycling is normal or not ?

I can see all the flex ducts and nothing is kinked, there is probably some extra on each run off the furnace that I could trim down to avoid some corners as the flex ducting is kind of a rats nest .

Going to be speaking with a service tech tomorrow and see what they say.
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Old 04-25-2021, 05:28 PM   #11
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Did it ever keep up with cold temp?
Bad thermostat? Something warming the thermo?
Or as suggested, an over-temp switch?
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Old 04-25-2021, 05:35 PM   #12
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Cycling is not normal until the set temp is reach. Fan should come on then fire to heat-fan run and heat till set temp. Once that's reach fire shut off and fan run until heat exchanger is cooled down. Then back on when temp drops below set temp and run through the cycle again.
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Old 04-25-2021, 05:45 PM   #13
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Cycling is not normal until the set temp is reach. Fan should come on then fire to heat-fan run and heat till set temp. Once that's reach fire shut off and fan run until heat exchanger is cooled down. Then back on when temp drops below set temp and run through the cycle again.
Ya thatís what I figured. I am guessing high limit switch is weak and is cutting out to easily. Not getting warm enough air through the vents
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Old 04-25-2021, 05:48 PM   #14
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Did it ever keep up with cold temp?
Bad thermostat? Something warming the thermo?
Or as suggested, an over-temp switch?
We just got the camper last week. Turned the heat on Friday afternoon and was very surprised when it wasnít heated up after a couple hours.

The furnace fan never cuts out , but I definitely could hear the burner turning on every so often during the last couple nights so something is kicking the burner out for some reason.
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Old 04-29-2021, 05:04 PM   #15
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I bought my '21 357MDOK back at the end of January....I live in Michigan and it was quite cold here after we brought the unit home. I tried the furnace a couple times after getting it home and was never impressed with the heat output or temperature rise either. I checked my ducts as well and found too much extra flex duct in my opinion, hindering flow. I also assumed since everything was "cold soaked" in the camper so maybe that was why it was taking so long to heat up. Unfortunately I haven't had any more chance to investigate it as my unit has been at the dealer almost 2 months now getting some other issues fixed. Once I get it back I plan testing it again now that it's been warmer. I haven't had mine long enough to remember if it would kick on and off like you mentioned while trying to reach temperature. I'd be interested to know what you find out with yours. I almost felt the furnace was under powered for a unit of this size...assuming its functioning properly.
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Old 04-29-2021, 05:39 PM   #16
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Sounds familiar. We will have to keep each other posted. Warmer here now so I might be fall before I can give it a good test again. Hope you didn’t have other major issues ?
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Old 04-30-2021, 10:32 AM   #17
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Sounds familiar. We will have to keep each other posted. Warmer here now so I might be fall before I can give it a good test again. Hope you didnít have other major issues ?
My kitchen slide and mid bunk slide were not aligned properly and needed adjustment...one didn't close properly and the other didn't extend properly. Also the refrigderator (residential) left door hit the island when closing the kitchen slide.
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Old 04-30-2021, 11:01 AM   #18
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Our residential rubs on the island also when I pulled it home.
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Old 04-30-2021, 11:46 AM   #19
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Could be possible with the equipment supplier shortages the furnaces are not the proper BTU installed smaller or not up to the old standards
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Old 04-30-2021, 11:56 AM   #20
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Being that yours is new, I would carefully inspect all of the ducting for the heater and make sure that the ducts are not obstructed with leftover building material (such as a wad of insulation). You could use a shop-vac and try blowing air through the ducts, but if you don't have one, a visual inspection certainly could reveal an issue. Keep in mind that there is an overheat limiter that will turn off the fire if the heater senses it is getting too hot, and the reason it is getting too hot (if it is) certainly could be due to poor air flow, which in turn could be an obstruction in the ducts (or a turn so tight in the duct work that the duct hose is not able to allow for the proper amount of air flow).
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