Old-Biscuit wrote:
Since 2004 Atwood combo WHs use common DC to control both electric & propane heating functions
Running out of water in fresh water tank would NOT empty the WH Tank....
Common DC from a FUSED source goes to Both On/OFF switches then to the common circuit board
Did the RED Fault Light come on?
*Check the DC Dist Panel Fuse that supplies WH with DC...
*Check the 2A DC fuse ON the WH Circuit Board
*Check the 'thermal fuse' (in the clear tubing) that is connected to T-stat via Brwon Wire (Remove from circuit abd plug brown wire directly onto T-stat to test if WH will come on (One shot thermal fuse)
Those items are common and would prevent either heat source from functioning
Use a Voltmeter to follow the DC...........
![](https://nebula.wsimg.com/obj/RTRCMkU0RDUzQ0M1ODE3RDgxMDg6YjcxODcxNGMwMGY1YjAzODVhNjY0NWNmMTFjMTg5YzY6Ojo6OjA=)
No 'resets' on WH except for Fault Light/Lock out (turn On/Off switch OFF---wait 30 sec---turn ON)
You Sir...are a genius....it was the 2 amp fuse on the circuit boarx...back in service