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Old 04-04-2017, 05:24 PM   #1
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Girard Water Heater tried to light/ no water

I'm out washing the Precept and turn coach power on to bring the awning in and the water heater is trying to light! It's parked in the driveway with no water connected so no water flow. It's an Girard tankless On Demand system so this makes no sense. Any ideas?
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Old 04-04-2017, 07:13 PM   #2
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Just a guess, but with no water in the lines, there's no pressure. The water heater is 'on demand,' meaning it's switched when it senses a drop in pressure in the water line. Either pull the fuse or find the power switch and turn it off.
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Old 04-04-2017, 08:02 PM   #3
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Quote:
Originally Posted by BFlinn181 View Post
Just a guess, but with no water in the lines, there's no pressure. The water heater is 'on demand,' meaning it's switched when it senses a drop in pressure in the water line. Either pull the fuse or find the power switch and turn it off.
I did turn it off but that doesn't solve the problem of why it tried to light when there was no water connected to the coach or in the tank. It shouldn't have tried to fire off. That's what the question is. Why?
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Old 04-04-2017, 08:38 PM   #4
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How would the WH sense the lines were empty? If, as I suggested, the WH fires up when it detects a pressure drop in the system, no water means no pressure. (actually 14.7 PSI - one atmosphere)

Here's a link to a Girard Tankless water heater manual.
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Old 04-04-2017, 09:46 PM   #5
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Quote:
Originally Posted by BFlinn181 View Post
How would the WH sense the lines were empty? If, as I suggested, the WH fires up when it detects a pressure drop in the system, no water means no pressure. (actually 14.7 PSI - one atmosphere)

Here's a link to a Girard Tankless water heater manual.
There can't be a pressure change when the water lines are empty. There wasn't a tornado or any other atmospheric change to cause the water heater to sense a change in pressure. You comments are not relevant or useful and I did read the manual thank you. If you can't answer my question in my original post please don't post conjecture, hyperbole and infer I can't read an owners manual, thank you.
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Old 04-04-2017, 10:33 PM   #6
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Water flow sensor/Air flow sensor......plugs into right side of control board

Unplug connector and clean up with electrical spray cleaner.

Nothing can happen unless flow meters make up so either bad sensor or bad connection

See pg 22
https://www.manualslib.com/manual/11...page=22#manual
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Old 04-04-2017, 10:45 PM   #7
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There can't be a pressure change when the water lines are empty. There wasn't a tornado or any other atmospheric change to cause the water heater to sense a change in pressure. You comments are not relevant or useful and I did read the manual thank you. If you can't answer my question in my original post please don't post conjecture, hyperbole and infer I can't read an owners manual, thank you.
Wow, what a hostile reply. I didn't suggest there was a change in air pressure, just that the air pressure would be below the threshold pressure that would trigger the WH to come on. The first sensor in the WH water inlet is a pressure sensor. It most likely uses a pitot tube that senses water flow by a difference in water pressure that drops as it passes by the tube compared to a static pressure chamber in the sensor. Airplanes and boats use pitot tubes to measure speed by the pressure changes in the fluid in which they are traveling.

Fact is, when water system is drained, the water heater should be shut off or have the fuse pulled to prevent accidental turn on in an empty system.

I in no way inferred you hadn't read the manual, I was just providing a link to the manual that might have provided you the answer to your own question. I'll not argue with you, I've always believed Mark Twain's saying, "Never argue with a fool, onlookers may not be able to tell the difference."
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Old 04-06-2017, 08:33 AM   #8
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Girard water heater

I have an idea!
Call Girard Tech support for assistance.
866-559-1221, then press "1"
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Old 04-12-2017, 09:13 PM   #9
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I have an idea!
Call Girard Tech support for assistance.
866-559-1221, then press "1"
I did. They are great and we are working thru it. They haven't had this problem yet.
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