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Old 03-27-2023, 05:56 PM   #1
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Ventana 4369 Oasis May Help

So getting coach ready for a trip (2019 model) we had no hot water, furnace zone 1&3 would not come on. Burner AC1 and AC2 working. I checked all fuses in small bath, behind power cord reel and in front drivers side lower bay. No glory. Zone board showed “Power” led and that’s it. No “Red” fault leds. For giggles I verified every 10 and 5 amp in Zone control box. Turned on Bypass and Loop1 Loop2 lit up green had hot water. Turned off. Disassembled slide out in bay behind power cord reel compartment to expose Distribution Module. Checked for voltage at Summer loop pump and nothing. Used a 12vdc power supply and verified SLP was good. All good so tapped on check valves for good measure. Finally heard back from ITR and opened up burner unit. To the right behind fuel pump is a “aqustat” with 12vdc on one side “Normal Open”. When hot aquastat closes and sends 12vdc to zone board I am assuming. I made a jumper with 10 amp CB and lo and behold everything came alive. So if this can help anyone else with their own problem then all is well

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Old 03-27-2023, 07:16 PM   #2
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Can you get a pic of the aqua stat when you replace it?
Ken & Diane
2014 Newmar Ventana 4369 All Electric 400HP
2023 Jeep Grand Cherokee Overland
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Old 03-27-2023, 08:36 PM   #3
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I will do that. I believe it is an A-73
It would be the “Heat Available Aquastat”
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Old 03-28-2023, 06:44 AM   #4
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Originally Posted by Sickntwisted View Post
I will do that. I believe it is an A-73
It would be the “Heat Available Aquastat”
Thank you. I’m sure your info will be helpful to someone.
Eddie and Jomaye, Retired
2018 Newmar Ventana 4369
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Old 03-28-2023, 08:29 AM   #5
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The aqua stat is sensing the cold water coming into the unit. That’s how it knows you are asking for demand. Reach out to your selling dealer or any NIRVC service center for replacement parts or help with repairs.
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Old 03-31-2023, 02:56 PM   #6
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2019 Ventana 4369 and Oasis - No hot water

Thanks for the post.
I have the same symptoms and am dreading the removal of the cargo bay tray, but the only way to get hot water today is to turn on the bypass switch.
I checked all of the fuses and wiring to the Oasis with no luck.
I suppose I should order the aquastat and a pump or two so I'm prepared.
Keith A
2019 Newmar Ventana 4369
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Old 04-01-2023, 02:26 AM   #7
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Not so hard to remove. 4 each screws in each corner for plywood floor. Push up from bottom and slide back slightly to clear latch. Then step through the open slider and remove 6 more hex head fasteners (3 in the back 3 at the front) Step back out of frame, close till latched then slide whole assembly out
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Old 04-01-2023, 02:30 AM   #8
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Here is the aquastat

Make the 10amp jumper with fuse and 2 male spades. My wires were Orange w/Black stripe & Orange connected to stat behind fuel pump on right side of burner
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Old 04-02-2023, 03:17 PM   #9
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Oasis Aquastat

Check out this thread (#1 and #5 are my posts about the Aquastat).
Eric and Linda
2016 Newmar Ventana 4369 (Full Timers since May 2016)
2022 GMC Canyon & 2015 Co-Motion Equator Tandem
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oasis, vent, ventana

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