I am new to Forum, and in desperate need of help!

[Mark_K5LXP]

Amplifying ExCalif's step one above, it would be basic exercise to verify the signals on the module's connections and make sure something "stupid" isn't wrong with external controls and input/output. Not sure if this is the exact schematic but it's representative of what's probably there. I would spend a few minutes with a meter poking around to see if there's anything unusual before swapping out the module. It might be discovered that just the relay controlling the element is whacked, or the ground for the module is corroded causing weirdness. You'd figure it out eventually but only after you bought and installed a module you didn't need.



Mark B.
Albuquerque, NM

 

[Christow19]

Seems to be GC10A-4E

 

[markandkim]

Install a new card.

 

[rgsauger]

At the risk of sounding simple, can you not turn it on 15 minutes before you are ready to take a shower, do your business, and then turn it off? I agree that it should operate properly but maybe this is a short term solution that you could use today.

 

[Gary RV_Wizard]

You've already done the thermostats, so I agree with the others - the indications are that the circuit board has failed and is literally out of control. Replace it.

 

[Christow19]

Where would it be best to get one of these controllers? And are you all simply speaking of the circuit board at the top right of unit?

 

[Ex-Calif]

Where would it be best to get one of these controllers? And are you all simply speaking of the circuit board at the top right of unit?

Yes the control box with the two white plugs in it.

 

[Kirk]

Seems to be GC10A-4E

Here is a link to download the service manual for your water heater. It does sound like you may need a new circuit board and if so I'd get one made by Dinosaur Electronics as they are better constructed, cost similar, and have a longer warranty than the OEM. I believe that you need the UIB64 that is available from Amazon and several other places.

 

[johnhicks]

Do this first; unplug the control board and see if the water heater heats on AC power. Some older units do _not_ use the control board, tstat and eco for AC operation. The AC stuff is contained in a box on the back of the unit.