Suburban electric and propane use the same temp t-stats.
Separate sets of t-stats BUT same temp range
Normal temp t-stat (one that controls heating cycles) 130*F
High temp t-stat (shuts down heating if normal fails) 180*F
Electric and propane use completely different controls/power
Electric uses 120V AC from a circuit breaker to the ON/OFF switch to the Hi temp/Normal temp t-stats to the element
Elements either get HOT or they don't work---no in between warm
ON/OFF switch (in outside compartment) fail due to exposure to environment
Hi Temp trips....has to be MANUALLY reset (push to rest cover above gas valve---left side electric/right side propane)
Voltmeter...
With 120V AC CB closed...turn switch ON and then check that you have 120V AC at the element connections
With 120V AC CB opened....test element continuity across the black/white terminals. S/B continuity (No continuity---element BAD)
Test white terminal to element flange. S/B no continuity (Continuity...element shorted)

Here is the Propane 12V DC wiring
