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Old 09-26-2014, 07:28 PM   #1
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Tankless Water Heater Not Working

Hello all,
The wife and bought a Jayco Greyhawk 29KS. We are currently on our first trip,
And I can't get any hot water. Propane is full an on, water heater is turned on and fires up but their is not any heat. I have purged the air out of the system, started the heater with water running and not. Water heater fires up and then turns off. Dealership could not do anything over the phone. Any help would be great. Thanks in advance
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Old 09-26-2014, 07:39 PM   #2
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Welcome
is this a brand new unit?

what model heater?

Are you sure it is turning off?

Maybe the bypass line(if equipped) is open mixing cold into the hot water line
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Old 09-26-2014, 08:09 PM   #3
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Looked in the manual but can't find the bypass you mentioned. Any idea where it might be located. Yes this is a brand new unit, and water heater is a Girard model GSWH-1M
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Old 09-26-2014, 08:12 PM   #4
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what model heater. You will have to look at the pipes in back of the heater and see what is there.


Look at the lines and see if there is a point where there is a valve that could mix hot and cold. see if it is open
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Old 09-26-2014, 08:25 PM   #5
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upon more research perhaps it doesn't require a bypass.

Are all taps closed on the outside shower? That is a common point where cold can mix with hot
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Old 09-27-2014, 07:25 AM   #6
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Did you try moving the control in the bathroom, or at least that is where mine is?
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Old 09-27-2014, 07:44 AM   #7
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Yup tried that control knob also. Re purged all the lines again started and restarted the unit . Looks like cold showers this morning .
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Old 09-27-2014, 08:11 AM   #8
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anything on google doesn't sound to promising about that system. Good luck but it is over my head. Sounds like a trip to a tech.

Never understood the need to change what always worked perfect in the RV industry.
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Old 09-27-2014, 08:32 AM   #9
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Do you have a water pressure regulator on your fresh water intake?

They are necessary to prevent blow outs on your plumbing fixtures but it sounds like these tankless heaters need 45psi at a minimum....

maybe pressure or lack of is the issue
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Old 09-27-2014, 09:17 AM   #10
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Yes we do have the regulator I also searched on Google and it seems this system is very sensitive. It's a Balmy 51 degrees outside so we may have to forgo the showers this morning .
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