Help with tankless. Any ideas?

[klucas]

I have a new gen 2 tankless water heater. It's been working great until tonight. Now the unit fan kicks on but no flame or spark. I pulled the cover and it doesn't have any codes flashing. I have just under a half tank of propane. Anyone have any ideas I can try to fix this??


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[Mbh818]

Might be silly to say, but make sure the propane is turned on. I've read about spider webs causing the heaters to malfunction so maybe make sure nothing like that is blocking the flame. Good luck!


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[jevanb]

Is the sail switch moving? Try to jump the flow switch they are prone to stick, it is the gold fitting in the back of the unit (inside) with 2 wires coming out

[klucas]

I did verify the propane and the sail switch. I will go out and look at the flow switch now.


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[klucas]

What one. The one in the left of the picture with the grey top or the on on the right looks like a all brass fitting with small black switch.


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[jevanb]

On the right... or center on the picture. With the black thing in the center and 2 small wires coming out. Hit it with a screwdriver as it might be stuck if that no fix jump it out of the circuit

[klucas]

Ok I will try it. How does that switch work and how does it keep the flame off?


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[klucas]

And explain how you would jump that. I don't want to do it wrong.


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[jevanb]

Their is a slug of metal inside that moves with water flow, I replaced mine 2 times as the little screen inside got some trash in it .

[jevanb]

See the ground wire??? Now look for the power wire.. just take the ground wire and a piece of another wire and touch to to power wire to complete the circuit to ground. As this turns on the burner when water is flowing, but do not leave connected and walk away... I made a push button switch with alligator clips and connected to both wires when mine went inop, when the wife needed hot water I went outside and pushed the button untill she was finished with the hot water, and I could get another switch, or if you have tools remove the switch and see if The slide inside is moving

[klucas]

I took the switch off and the fan stopped. I out it back on it clicked then fan came back on. No flame. Does this mean something else is wrong?


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[jevanb]

You took the switch off??? You should of jumped the ground to the power , that by passes the switch. And will turn on the propane ignition. Call Girard tomorrow they will talk you thru troubleshooting other issues...

[klucas]

I jumped it first and nothing happened. I will call once they open today. Very frustrating.


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[klucas]

I just got of the phone with tech support. The white sensor is a over heat switch and reset. I just had to push the button and all is good now. The tech told me it overheated and protected itself by this switch. Apparently in the shower with the mixing valve you can't use any cold water. Hot water only and use the dial to adjust the temp. I hope this info will be useful to someone else one day.



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[Phil57]

Klucas
Thanks for the update. It's frustrating when a main utility does not work. Thanks for sharing the fix.


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[Mmnsc]

I have found the overheat safety tends to trip when you change campsites and get air in the system. When you purge the air out make sure the power switch on the heater is off. When the switch is on, you get a temporary spike in water temp that trips the switch thus requiring it to be reset.

[klucas]

Originally Posted by Mmnsc

I have found the overheat safety tends to trip when you change campsites and get air in the system. When you purge the air out make sure the power switch on the heater is off. When the switch is on, you get a temporary spike in water temp that trips the switch thus requiring it to be reset.

Great tip. Also good to know that reset is there. Thanks



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[klucas]

Originally Posted by Phil57

Klucas
Thanks for the update. It's frustrating when a main utility does not work. Thanks for sharing the fix.


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Yes, it is very frustrating. It usually happens at the worst time. Murphy's law. Good to have the fix and hope this easy fix will help others. Also the fact to not use any cold water on the mix valve also. The gen 2 is very different in that regard from the original gen1 we had in our coach at purchase. But this one seems to have much better performance.


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[jevanb]

glad you got it fixed, sorry I did not think of that issue because mine did that same thing once, we just got back in town camping for the last 1.5 weeks and internet no work at most of the places

[Mbh818]

👍


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