clicking - water heater

riltri wrote:

dougrainer wrote:

Old-Biscuit wrote:
If 2004 or newer model that clicking is the DC Relay that closes to allow AC to the element
It is failing
DC Relay and element are inside that protective cover on backside of WH Tank

Never heard any of my RV water heater electric elements click or any clicking from an electric residential WH
Heard them 'buzz' from scale/calcium build up but no CLICKING

He has a 2015 model. The relay may indeed be bad. BUT, a way to test is to install a AC amp meter on the circuit and see if you have loss of amp draw during the clicking. AND, IF the clicking is at the BACK of the WH, then the relay would be suspect. IF at the front, then no. BUT, I would also test the YELLOW wire at the Circuit Board for intermittant 12 volts. That is the activation wire for the Relay. IF the yellow has on and off 12 volts, the circuit board is BAD. Doug

Click is definitely coming from the back not the front. Sounds to be coming from the metal box.

Yellow wire spikes between 5.x and 12.x with each click. NEG to drain plug if that makes any difference.

Will have to take garage apart again to test the AC in the back and we are pulling out shortly. Will test tomorrow when we get to the next CG.

Thanks for the help!!!

Yellow wire is the DC from circuit board to the DC Relay
It should be constant voltage ...not fluctuating
As I stated earlier....the DC Relay is failing

Bigger issue is ACCESS
Don't forget that under that cover is DC and AC Voltages