Question about RTO Atwood DSI-RV Water Heater-6 Gallon

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Circuit board not getting power to e.c.o. G6A-7E Hot water tank not turning on gas checking parts, circuit board has power,getting power to thermostat side but not to eco side.ECO turns your gas valve on right? ECO reads open as well as thermostat. Thanks

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Hi, well it basically works like this, we have the Power coming in on the PHASE, now that goes to ONE of the Pair of NORMALLY CLOSED "Contacts", the "Hot Side" on a Thermostat, then from there the PHASE continues on, through the other contact, on the "Cold Side", to the ELEMENTS "HOT Side" and then across the Element the NEUTRAL. Thus the Circuit is complete. Have a look below for a rudimentary circuit. So troubleshooting is pretty easy as you can see. You simply need to check, if you have Voltage, at each successive point, working to the element, many times it is the Thermostat, as you can see that controls everything, BE CAREFUL. circuit board not getting power to e.c.o. G6A-7E - bca8dd9.gif

Posted on May 30, 2010

  • ted_willi490 May 30, 2010

    Had power going through thermostat to circuit board no power out of board. Bad board the problem for further reference. Thanks for your time. Ted



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First check that any by-pass valves are in proper position. Remember, cold water has to enter in bottom fitting at back of tank, and hot water comes out at top fitting. Thus any valves that may be there, need to be in open position, and any valve between those 2 lines will need to be closed. If all valves are in proper position and working as they should, I would suspect you have a faulty check valve between top (hot) line fitting and tank. One easy way to check that before replacing it, would be to shut incoming water source off, whether running off pump or hose attached outside. Then relieve all pressure in system by opening taps until all pressure is gone. Now, go outside and open pressure relief valve carefully ( in case it's hot ) and make sure pressure is relieved there as well. Now, carefully hold pressure relief valve open while you have someone turn water back on, and see if you get good flow from pressure relief valve. If you get good pressure coming out of there, that tells you your tank is getting full, and you have water coming in as needed, so problem has to be on hot side ( top fitting ) and/or onward from there, which would be check valve fitting at top next to check. Remove the check valve and If you don't have a new check valve to try it, just put a short galvanized 1/2" pipe nipple in there for now if needed and that should do it, just attach your fitting directly to nipple. Before you do this, make sure you have removed all aerators etc on taps that may be plugged and tested pressure that way as well just in case. I have seen all of them plug up at same time before. If you remove them and get good pressure, then problem solved.

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I would like to know the electrical requirements.( voltage and amperage) Does it plug in or is it hard wired? If the power goes out is the hot water also out? thankyou

Are you asking about tankless gas or tankless electric?

You posted under Tankless gas water heater: gas type tankless plugs into standard 120Volt household outlet to power circuit board. You need larger gas line than used for tank-type gas water heater.

If you are asking about volt and amp draw of Tankless electric, then that depends on specific model number.
For example, if each tankless element draws 3500Watts, and unit has 3 elements, you will need 3 additional 20 amp 240Volt circuit breakers. Volts x amps = watts. 3500 watts divided by 240Volts = 14.58 amps. At full blast, this unit would draw 43.75 amps and will cost more to operate yearly than tank-type electric water heater. If unit has 4500 watts elements, then it will draw 56 amps at full blast, and use a good percentage of household power.

Tankless water heaters have no hot water in power outage. This is true for gas and electric models.

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