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Old 08-20-2019, 03:14 PM   #1
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Extend-A-Stay messing with water heater

We have had our '19 Miramar 37.1 for about 13 months now. We have had an on-going intermittent problem with the water heater since we got it. Its a Girard tankless. It would fire but then immediately shut off giving an E2 error which is a flame sensor/gas pressure issue. Of course it would never act up at the dealer and they couldn't find anything wrong. We had the extend-a-stay on our old rig and installed it on the new one before our first trip. So...come to find out, the extend-a-stay is what has been causing the water heater issue.
I took it off today and the water heater is working fine.

So my question to those that have used an extend-a-stay is have you ever had an issue using it? I had it attached to the propane tank prior to the gas regulator. It should just let the gas through to the regulator. I am guessing the Girard is a little more sensitive to pressure changes.

What do you think?

2019 Thor Miramar 37.1
2013 Honda CRV Toad
2004 Georgetown XL 370TS - Sold
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Old 08-20-2019, 04:47 PM   #2
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I may have been restricting the flow a little bit. Some do have check valves in them so it doesn't back fill the tank when using the extend a stay tank.

I have a extend a stay type fitting on my MH along with a tankless water heater. Haven't encountered your issue.

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Old 08-20-2019, 04:49 PM   #3
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The image looks like only a Tee with fittings, however the product details reveal an interesting clue (Tee is made of heavy-duty brass and has built-in excess flow protection) The flow protection combined with the water heater burner/flame proving design could cause a flame detection error.
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Old 08-20-2019, 08:41 PM   #4
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I would agree that it probably restricts the flow somewhat. The weird thing is I thought that might be the case a while ago. One of my sons is in HVAC. He brought over his manometer and we checked the pressure. It was at 9.5 and should be at least 11. We adjusted it up to 11.5 and the water heater still acted up about 50% of the time. Strange.
2019 Thor Miramar 37.1
2013 Honda CRV Toad
2004 Georgetown XL 370TS - Sold
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heat, heater, water, water heater

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