How to turn it on - Rheem 40 GAL ELEC TALL Water Heater 6YR SC 82VH402

turn off power to unit and also should have a valve inline on gas feed next to the unit turn that off --

Combi-boiler-turn hot water tap on/off and the heating stops for ...

singletrackworld.com/.../combi-boiler-turn-hot-water-tap-onoff-and-the-...

Combi-boiler-turn hot water tap on/off and the heating stops for 20secs ... hot watertakes priority over central heating so when you run the hot tap, heating is ... Yeah onmy worcester combi there is a diverter valve - it feeds either the heating or ...

My central heating works but I have no hot water - 24'7 ...

https://www.247homerescue.co.uk/my-central-heating-works-but-i-have-...

Diverter valves switch heat between the hot water and the central heating. When youturn your hot tap on, the diverter valve temporarily shuts off the water supply ...

Does your boiler keep switching itself off? Here's why ...

www.dhs-uk.com/does-your-boiler-keep-switching-itself-off-heres-why/

Jul 7, 2015 - ... Bathroom Suites, - Showers, - Wet Rooms, - Taps and Accessories, Information and ... Low water pressure can cause your boiler to turn itself off. ... boiler is not turning off, you aren't getting the amount of hot water you require. ... If there is air in your central heating system, then your boiler may shut down.

does it turn without being pushed in?

Replace the rough in valve

When the handle is in the same position as the entrance and exit, the valve is open.. The stops on the valve are visible and cast so that you can see if they are hitting the handle. If it wont turn make sure you are turning it the right direction.

http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html#flow
1) Tankless require minimum flow rate before burner will activate.
2) Sounds like the water pressure drops quickly when faucet turns on. This implies combination of problems including sediment build up inside lines, crossover at single-handled faucet, or sediment filter clogged or water softener clogged.
3) Low flow faucets can reduce needed flow rate.
4) Other problems can contribute: sensor failure, loose wires, PC board failure, high temperature setting, cold incoming water temperature during winter months.

Centre tap of the rinnai will turn off hot water supply only.
Easiest way is to turn off your mains water supply. This will isolate both hot and cold, no need to turn off anything else

if you turned the breaker to the left to turn off you must turn the breaker all the way to the right to reset it same as if you turned to the right you must turn to the left all the way to reset which ever way you turned the breaker off you need to follow thru the process in order to reset that breaker breakers are spring loaded flip it completly off than on

Did you turn the breaker completely off, then back on? When a breaker trips it is in a middle position, and nust be turned off to reset it, then it can be turned back on.