Suburban hot water heater

The problem was no 12v power. Had to run new power to the switch. Something came unhooked probably in the ceiling maybe a wire nut. Not sure but it is working now. Thanks everyone for the help.

Suburban doesn't use a 'thermal cut off' or a fuse on circuit board

12V DC is fused in DC Dist. Panel and connections made in junction box backside top of water heater.

Twopump78 wrote:
When I turn on the gas switch nothing happens no fault light no spark. I bought a new circuit board and still nothing. The stove lights fine. The heater works on electric.

Sounds like a, no 12v power issue...
Not sure if the Suburban are similar to the Atwood water heaters. If they are, then, check the 2 easiest things first.
On the Atwood these 2 components are easy access, under the outside water heater panel.

A small automotive type fuse, and then the most likely culprit, the Thermal cutoff link.

Probably a good idea to do a google search on your Suburban water heater model number and get the shop manual to help you troubleshoot your problem...

Just had a Thermal cutoff link go out on mine. Seem to be a common problem. Forum member Lincster sent me one for free...
You can take it out and bypass it temporarily by plugging the thermal cutoff link wire directly into the heater for troubleshooting purposes, then the water heater should work fine if that was the problem. Was on mine.

jmo

In outside compartment.......rubber cover with 'Push to Rest'
IF HI Temp T-stat tripped......no workie.

IF it has tripped and resets....then you will need a new set cause normal t-stat is not opening, that is why HI temp one is tripping.
12V DC set of t-stats (not 120V AC---they're for the electric)

If it's not tripped t-stat..then you need to check for 12V DC power (blown fuse, loose wire in junction box)