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Old 12-30-2020, 04:08 PM   #1
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Brand: Thor Motor Coach
Model: Windsport 31s
State: Florida
Posts: 48
THOR #18965
Banging Noise, Where to Start?

We have a 2018 Windsport 31s and we are getting that loud banging noise when we run the water pump.

I have researched this issue and found a couple of possible causes for this but I donít know where to start. As such, I am wondering if anyone who has fixed this problem can tell me what fixed the problem for them so I know where to start. My understanding is these are the most likely fixes:

Mousepad under Pump Motor
Wrap Pipes
Rebuild and/or Outright Replace Pump Motor (Keep old as spare)

Also, can someone tell me where exactly the pump motor is located. Last thing, we noticed after an hour or two if we leave the pump on when we are not actively using any water, we hear some light banging noise. This concerns me because it sounds to me like I have a leak. Does anyone else encounter this?

Thanks in advance for your assistance.

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Old 12-30-2020, 05:31 PM   #2
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Brand: Thor Motor Coach
Model: Hurricane 31S
State: Texas
Posts: 3,488
THOR #6411
Quote:
Originally Posted by Rey&Reina View Post
We have a 2018 Windsport 31s and we are getting that loud banging noise when we run the water pump.

I have researched this issue and found a couple of possible causes for this but I don’t know where to start. As such, I am wondering if anyone who has fixed this problem can tell me what fixed the problem for them so I know where to start. My understanding is these are the most likely fixes:

Mousepad under Pump Motor
Wrap Pipes
Rebuild and/or Outright Replace Pump Motor (Keep old as spare)

Also, can someone tell me where exactly the pump motor is located. Last thing, we noticed after an hour or two if we leave the pump on when we are not actively using any water, we hear some light banging noise. This concerns me because it sounds to me like I have a leak. Does anyone else encounter this?

Thanks in advance for your assistance.
The fresh water pump is below the false floor under the kitchen sink. There is an inspection panel with screws at the four corners that allows for a pump replacement. The entire false floor can be removed by prying it up, carefully bending it and sliding back and up against the back wall. The two water lines run in the above floor chase back to the outside sink and water heater. They are not tired down or insulated. It is easy to buy some foam pipe insulation and insulate both pipes against floor and walls of the chase to cushion the vibration. You can slide the insulation down to under the shower by removing the propane furnace beauty cover. You can access the other end of the pipes by removing the water heater access panel under the bedroom dressing table (under the TV) and adding more pipe insulation under the shower to lessen the vibration there.


There is a one way valve in the water pump head. Over time it can develop a leak letting water drain back into the fresh water tank. There are three options if that bothers you: replace the pump. replace just the pump head or install a check valve between the tank and the pump. I used a well water pump "foot valve".
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Old 12-30-2020, 05:41 PM   #3
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Brand: Still Looking
Model: Winnebago Travato 59G
State: Alabama
Posts: 4,512
THOR #6826
Most likely it is the PEX pipes banging against something as the pump ďpulsesĒ in its normal operation. Iíd start by running the pump while moving through the coach to find where the noise is the loudest. Since itís plumbing related there will be a pipe nearby. Find a way to reach it and see if grabbing it doesnít quiet things down. If you are able to find an offending pipe either zip tie it to something or slip some pipe insulation over it.
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Old 01-01-2021, 01:25 PM   #4
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Brand: Thor Motor Coach
Model: ACE 30.2
State: Massachusetts
Posts: 441
THOR #8180
Are you running the pump when on city water? Itís not necessary.
If running the pump off the fresh water tank the pump should energize, press up the system and stop with no faucets open. If you hear the pump cycling on and off with no faucets open you have a leak somewhere.
With the pump stopped and the system up to pressure (no pump cycling) open each faucet and listen for the banging sound. Does it happen with every faucet? Turn off the pump, shut the pump inlet valve, and locate the screen filter before the pump and make sure itís clean. Not likely a cause but possible if clogged. The pump would be starved and continue cycling on and off.
Iíd say put in a new pump and it would be a quick way to determine if the pump was indeed the issue but it seems your pump isnít easy to get to. Mine is in a lower compartment (wet bay) where the sewer valves are located so mines an easy fix.
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