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Foretravel Motorhome Forums => Foretravel Tech Talk => Topic started by: Green99 on December 31, 2019, 03:10:54 pm

Title: 99 U270 water heater not working on gas side
Post by: Green99 on December 31, 2019, 03:10:54 pm
While the electric part of the water heater works fine. the gas side has stopped.  I only have the one switch at the kitchen sink and there is no power to the switch.  I can not find a print for the water heater or wiring.  Does anyone know the print number for a similar coach?  Also, anyone who could tell me where to start to track this down would be appreciated.
Thanks and Happy New Year to all the forum members,
Jerry
Title: Re: 99 U270 water heater not working on gas side
Post by: bdale on December 31, 2019, 03:40:06 pm
Are you getting any response from it all?  Is it trying to light?  Assuming your gas in on, 1st thing I would probably check is that you have power to your control board, and the thermal fuse is ok.  Both are located on the water heater itself.  You can test the fuse with a continuity meter, or temporarily bypass it with a jumper wire.

Amazon.com: Atwood 93866 OEM RV Water Heater Thermal Cutoff Kit - Replacement... (https://www.amazon.com/Atwood-93866-Heater-Thermal-Cutoff/dp/B077YR29HL/ref=asc_df_B077YR29HL/?tag=hyprod-20&linkCode=df0&hvadid=312202698398&hvpos=1o1&hvnetw=g&hvrand=1113037401946395542&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9027666&hvtargid=pla-569124232479&psc=1)

Also, make sure that your water heater access door is closed.  Mine has a switch to prevent the water heater exhaust from burning the door while it's open.  An open door or a bad switch can prevent it from running.

Title: Re: 99 U270 water heater not working on gas side
Post by: Twig on December 31, 2019, 04:55:28 pm
Are you getting any response from it all?  Is it trying to light?  Assuming your gas in on, 1st thing I would probably check is that you have power to your control board, and the thermal fuse is ok.  Both are located on the water heater itself.  You can test the fuse with a continuity meter, or temporarily bypass it with a jumper wire.

Amazon.com: Atwood 93866 OEM RV Water Heater Thermal Cutoff Kit - Replacement... (https://www.amazon.com/Atwood-93866-Heater-Thermal-Cutoff/dp/B077YR29HL/ref=asc_df_B077YR29HL/?tag=hyprod-20&linkCode=df0&hvadid=312202698398&hvpos=1o1&hvnetw=g&hvrand=1113037401946395542&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9027666&hvtargid=pla-569124232479&psc=1)

Also, make sure that your water heater access door is closed.  Mine has a switch to prevent the water heater exhaust from burning the door while it's open.  An open door or a bad switch can prevent it from running.


He states no power at the switch. This would have to be a fuse to the switch.
Title: Re: 99 U270 water heater not working on gas side
Post by: Green99 on December 31, 2019, 05:00:46 pm
That is correct there is no power to the switch. 
Title: Re: 99 U270 water heater not working on gas side
Post by: P. Wyatt Sabourin on December 31, 2019, 08:55:43 pm
Do you mean there is no 12 volt power to the switch or there is no 120 VAC power to the switch?
The switch in my the kitchen has 12 volt power and turns on the gas, but does not have 120 VAC power.
The 120 VAC switch is at the foot of the bed.
Title: Re: 99 U270 water heater not working on gas side
Post by: Green99 on January 01, 2020, 06:40:04 am
Wyatt,
That is correct there is no 12v power to the switch.
Title: Re: 99 U270 water heater not working on gas side
Post by: Twig on January 01, 2020, 10:30:34 am
I only have the one switch at the kitchen sink and there is no power to the switch. 
At the foot of the bed is your 12V fuse panel. One of the fuses should be labeled water heater. Check there first.
Title: Re: 99 U270 water heater not working on gas side
Post by: Green99 on January 01, 2020, 11:26:58 am
Twig,
Thanks for the response.  The fuse is good.  My issue is that without a print I don't know if it goes from the fuse to the switch or down to the water heater then back to the switch.
Title: Re: 99 U270 water heater not working on gas side
Post by: craneman on January 01, 2020, 11:42:25 am
Twig,
Thanks for the response.  The fuse is good.  My issue is that without a print I don't know if it goes from the fuse to the switch or down to the water heater then back to the switch.
Not real familiar with the issue, but if it didn't go to the switch first and it went to the water heater wouldn't the water heater be powered on all the time?
Title: Re: 99 U270 water heater not working on gas side
Post by: Moby on January 01, 2020, 12:14:32 pm
Twig,
Thanks for the response.  The fuse is good.  My issue is that without a print I don't know if it goes from the fuse to the switch or down to the water heater then back to the switch.

Common practice would be to go to switch first one would assume.
Title: Re: 99 U270 water heater not working on gas side
Post by: Twig on January 02, 2020, 05:16:07 am
Next to the water heater switch should be the water pump switch. Jump the 12V from that switch to the heater switch and see if the heater lights.
Title: Re: 99 U270 water heater not working on gas side
Post by: Green99 on January 02, 2020, 10:44:58 am
Twig,
Excellent idea I will try that.
Thanks.
Title: Re: 99 U270 water heater not working on gas side
Post by: Green99 on January 02, 2020, 02:59:52 pm
PROBLEM SOLVED.  After pulling the fuse the 2nd time and looking at it under a light, the fuse was bad.  Soooooo as Jeff Foxworthy might say:
Here's my sign.  Thanks to all for the help.
Title: Re: 99 U270 water heater not working on gas side
Post by: FourTravelers on January 02, 2020, 06:50:49 pm
Yep
Always best to check fuses with a volt/ohm meter rather than a visual.
Especially the smaller amp rated ones.