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Old 03-20-2023, 01:19 PM   #1
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Excessive Under Cabinet Heat

I am looking for reason excessive heat coming from under kitchen sink cabinet in 2021 Dutch Star 4369.
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Old 03-20-2023, 01:36 PM   #2
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Isn't that where the dishwasher is located?
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Old 03-20-2023, 02:56 PM   #3
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Most of the time when this is experienced, the bypass switch on the silver Oasis control box was left on by the dealer. When in bypass, fluid is circulated through the coach heat registers.
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Old 03-20-2023, 04:57 PM   #4
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Yes.....make sure this switch is off. The box is on the right wall of the Oasis bay on the driver's side.


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Old 03-20-2023, 11:29 PM   #5
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Oasis problems

I didnít have hot water and turned the bypass switch on not knowing any better and got hot water and had excessive heat under the kitchen sink. When I turned the bypass off the excessive heat under the sink went away but I didnít have hot water. When I turned on the bypass I got hot water again. Iíve read the oasis info from Newgle but still donít know how to fix it. What is the fix?
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Old 03-21-2023, 04:23 AM   #6
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You have a bad summer loop pump,need to replace the pump. Not a hard job,something done quite often. The reason you get excessive heat when the switch is in bypass is that it overrides the thermostats and runs the heat loop pumps all the time which will get you hot water but excessive heat. BTW, there are three pumps and all the same.
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Old 03-21-2023, 05:02 AM   #7
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I also get a lot of heat under the sink cabinet, and my bypass switch is off. I think it may not be as abnormal as some portray it. My basement gets plenty warm in the summer months.
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Old 03-21-2023, 05:37 AM   #8
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Originally Posted by USMCRET View Post
I also get a lot of heat under the sink cabinet, and my bypass switch is off. I think it may not be as abnormal as some portray it. My basement gets plenty warm in the summer months.
You can reach into the kitchen cabinet far enough to put your hand on the copper pipe going to the heat register. If the pipes are hot, you either have the bypass switch on, or a stuck loop 1 valve in the distribution module. I have the stuck loop 1 valve problem. Every time I use the furnace the loop 1 valve sticks open. I have to crawl into the bay and give it a light tap, problem solved. When I get ready to replace the Oasis fluid in a few years, I will pull the distribution module and replace the valve. Itís not a problem that occurs often, so no hurry.
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Old 03-21-2023, 12:07 PM   #9
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Here is a great photo of the summer loop pump's location another poster took. ITR, the manufacturer of the Oasis unit, can sell you a pump, or many are using an aftermarket pump at half the price.

If you search Oasis summer loop pump, you'll find a LOT of posts about it and how to replace one. Not hard, just in an awkward spot. You have to crawl into the 3/4 bay on the passenger side, remove a false wall (several square head screws) and then the cover to the Oasis.

https://www.irv2.com/forums/f103/oas...-439243-3.html

https://www.ussolarpumps.com/catalog...culating-pump/

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Old 03-21-2023, 10:41 PM   #10
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Summer Pump

When I had the distribution module open the other pumps ran as expected but the summer pump started for a few seconds then quit.
It would be nice if I could take a meter reading on the power leads to confirm the pump motor is the problem.
Thanks for the advice on the summer pump, just trying to get them to answer the phone so I can order a new pump.
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Old 03-22-2023, 06:45 AM   #11
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When I had the distribution module open the other pumps ran as expected but the summer pump started for a few seconds then quit.
It would be nice if I could take a meter reading on the power leads to confirm the pump motor is the problem.
Thanks for the advice on the summer pump, just trying to get them to answer the phone so I can order a new pump.
You seem to be trying to explain two different problems. You originally stated that you had excessive heat under the kitchen cabinet, and your bypass switch was not on. I told you to reach under the cabinet and feel the copper pipe going to the heat exchanger. If itís hot then, you either do have the bypass switch on, or your domestic hot outlet loop one check valve is stuck open. The summer loop pump is powerful enough to push hot water through a stuck loop valve. This situation has nothing to do with a failure of the summer loop pump. You crawl in the bay and lightly tap on the valve, wait about a half an hour then the copper pipe should be cool to the touch.

The other issue you speak of is you can feel the loop 1 & 2 pumps running normal, but it doesnít seem like that for the summer loop pump. If your loop 1& 2 pumps are running then you either have the Oasis system in the furnace mode, and the furnace is running or you are using hot water or the system is coming to temperature, or you have the bypass switch on. Use a mirror to look at your bypass switch, and make sure it is toggled to the off position.
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Old 03-24-2023, 08:59 PM   #12
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When we took delivery in 2018 it was hot under the kitchen sink as the bypass switch was left in the on position when it left the factory. We have since had the summer loop pump fail twice, the second time just recently. Instead of turning the bypass switch on to get hot water, we turn on the rear furnace to get hot water in the morning for showers. Saves going outside to turn the bypass switch on and then again to turn it off.
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Old 03-25-2023, 07:16 AM   #13
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Timely

This is a timely read as we have had the same issue. I assumed it was normal due to the electronics in the bay under the kitchen. I just checked and ours was on so I turned it off.

What I may have missed in all of the posts here is when the switch is supposed to be on or off. Is it supposed to be off all of the time?
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Old 03-26-2023, 06:43 AM   #14
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This is a timely read as we have had the same issue. I assumed it was normal due to the electronics in the bay under the kitchen. I just checked and ours was on so I turned it off.

What I may have missed in all of the posts here is when the switch is supposed to be on or off. Is it supposed to be off all of the time?
The switch is supposed to be off. It is used for the initial filling of the system, or if changing out a pump and you need to purge the system. It can be used on an if needed basis if the summer loop pump fails. You would turn the boost switch on when you needed hot water. It is not meant to be left on, as the pumps run continuously.
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