Forum Discussion
Old-Biscuit
Oct 04, 2018Explorer III
2003 Vintage RV so you have one of the last old style versions (2E/3E)....2004 models were incorporated to a DC Control Circuit
Yours has separate controls, t-stats etc for each heat source
The 120V AC is direct wiring....
AC Power from a Circuit Breaker>>>>>to ON/OFF Switch>>>>>to set of t-stats (normal temp/high temp)>>>>>to element (On/Off switch/t-stats/element---on backside of WH Tank)
15A CB tripped because of a short on the 120V AC circuit....most likely at the t-stats when repair guy was messing around with it with AC Power on
No AC Heating
Tripped Circuit Breaker
Bad t-stats
Bad element (should have continuity between black wire/white wire terminals W/O AC Power ON-------should NOT have continuity between white wire terminal and element flange)
As for t-stat mounting...
From your description the normal and high t-stats are on a mounting plate.
AC wiring goes from one t-stat to other t-stat and plate is mounted to tank wall
With only one mounting not sure if t-stats can be held tight against tank wall...if not the t-stats may not open/close at pre-set temps (N-140*F/H-180*F)

IF you have decent access to backside of WH Tank.......mobile welder/or weld shop----someone that can weld aluminum---and have it fixed
First I would reset that tripped 15A CB...water in WH Tank and try the AC Heating. If it heats then check water temps
If 15A CB trips...then continuity tests thru both t-stats and element
Set of t-stats.....Atwood 90037 (combo set...replaces the individual part numbers)
Combo T-stat Kit
Bolt on element....Atwood 91580
Bolt on style
Course parts may not be right ones if your model is different then suspected cause you didn't post what model you have?????????
Yours has separate controls, t-stats etc for each heat source
The 120V AC is direct wiring....
AC Power from a Circuit Breaker>>>>>to ON/OFF Switch>>>>>to set of t-stats (normal temp/high temp)>>>>>to element (On/Off switch/t-stats/element---on backside of WH Tank)
15A CB tripped because of a short on the 120V AC circuit....most likely at the t-stats when repair guy was messing around with it with AC Power on
No AC Heating
Tripped Circuit Breaker
Bad t-stats
Bad element (should have continuity between black wire/white wire terminals W/O AC Power ON-------should NOT have continuity between white wire terminal and element flange)
As for t-stat mounting...
From your description the normal and high t-stats are on a mounting plate.
AC wiring goes from one t-stat to other t-stat and plate is mounted to tank wall
With only one mounting not sure if t-stats can be held tight against tank wall...if not the t-stats may not open/close at pre-set temps (N-140*F/H-180*F)
IF you have decent access to backside of WH Tank.......mobile welder/or weld shop----someone that can weld aluminum---and have it fixed
First I would reset that tripped 15A CB...water in WH Tank and try the AC Heating. If it heats then check water temps
If 15A CB trips...then continuity tests thru both t-stats and element
Set of t-stats.....Atwood 90037 (combo set...replaces the individual part numbers)
Combo T-stat Kit
Bolt on element....Atwood 91580
Bolt on style
Course parts may not be right ones if your model is different then suspected cause you didn't post what model you have?????????
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