Problem with Atwood water heater

[dmcrick]

My water heater is electric and gas. When I turn the switch on it does not work on electricity. It does operate and ignite on gas. However it runs until the pressure relief valve spews water. I have changed out the thermostat and ECO. What could the issue be? Does it need a new circuit board?

[Old-Biscuit]

New T-stats not properly installed.......they need to be tight against a clean surface on WH tank wall. Normal temp t-stat opens at 140*F. ECO t-stat opens at 180*F

When you say PRV 'spews' water.is it actually blowing water OR weeping water?
Weeping water can be due to loss of 'air pocket' in top of WH.
Turn off water, open a faucet, open the PRV via lever until water stops flowing out then let PRV snap close, close faucet, turn on water.

Electric doesn't work........tripped AC circuit breaker OR burnt up electric element.

[Caveman_Charlie]

We are going to need the make and model number of the water heater before anyone here can try and help you. There are several different models