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Old 08-14-2018, 12:46 PM   #1
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Brand: Thor Motor Coach
Model: Miramar 35.3
State: Florida
Posts: 185
THOR #6451
Water leaking from furnance

We had our Miramar 35.3 out for a trip this last weekend and we had a ton of rain. I noticed a puddle coming out under the fridge onto the floor. I pulled out the bottom drawer under the stove which is next to the fridge near the floor. There was water dripping from the bottom of the furnace. I did some research and I read that the vent pipe on the outside had a 45 degree angle so water couldn't come in. Once the rain stopped, I went outside and pulled out the vent pipe. The pipe is angled but it was installed with the angle down! Here is a picture of the vent pipe that I pulled out.





Not sure how to fix this as I can't flip the pipe with the angle going up as it won't fit into the compartment. I live in Florida so I don't use the furnace very often so I guess I need to cover the vent hole when it rains until I can figure out a permanent fix.


Burch
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Old 08-16-2018, 03:19 AM   #2
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Brand: Thor Motor Coach
Model: ACE 27.1
State: Virginia
Posts: 315
THOR #7607
Are you sure the water was entering the tailpipe? Many folks have trouble with the seal across the top of the furnace compartment cover leaking as water runs down the side of the motorhome in rain or washing. There is a little circuit board in there that can get waterlogged and start sputtering the furnace even though it's not turned on.
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Old 08-16-2018, 03:47 AM   #3
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Brand: Thor Motor Coach
Model: 2017 Axis 25.4
State: Arkansas
Posts: 2,357
THOR #12231
I would check around the cover on the side of the RV. Perhaps you need a bead of silcone alone the bottom edge on the inside of the compartment? I know on my frig it looked like water could leak into this area after a hard rain so I put a bead along the bottom to be safe. Or the cover is not fitting / sealing correctly?
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2017 Axis / 25.4: Big Foot Levelers, Aims 1200 Watt inverter, Ceramic Window Tint, Full River AGM 6V batteries, Front Hellwig Sway bar / Rear Track Arm, Safe T Plus Steering Stabilizer, PD 4655 converter, Hard Wired Surge Guard, WEboost + WiFi Ranger, LED Headlights/Driving lights, Fresh water surge tank, Black Tank Tornado flush, 4999 zip ties.
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Old 08-17-2018, 03:34 PM   #4
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Brand: Thor Motor Coach
Model: Miramar 35.3
State: Florida
Posts: 185
THOR #6451
The seal around the cover outside is good. The only way water can get in to the furnace is through the vent. If you look at the picture of the vent tube, the angle is down. It's supposed to be up. Water flows downhill and if it was pointing up this wouldn't have happened. The outside compartment was basically dry. The water dripped out of the furnace for a couple of hours so I'm hoping the furnace isn't damaged.
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