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Is it flowing through the unit? Are you getting an error code? What make and model is the unit?
Do you have a pressure relief valve plumber to the outside?
Try this for me. Turn on full hot at a bath tub. And then go back to the unit and tell me if it fires
I have the feeling you have cold mixing with the hot or you have a flow restriction so I am trying to determine if it's a low flow issue or not
Well if the pressure relief valve produces hot water then it's a lower flow issue. You may have scale caught in the flow sensor. Try flushing it again and see if it dissolves. What happened when you ran the tub?
So it's a low flow issue. Try this before flushing again. Turn off the valves under the kitchen sink and then see if it still happens at the shower.
So the only issue is the kitchen sink?
Turn off the cold to the sink and then run hot water several times to test it.
I understand the phone call issue. Thank you for what you do.
I'm 90% certain it's got nothing to do with the water heater and more to do with cold water mixing. Is this in your house?
Do you have a hose Bibb that has hot water hooked up to it?
Please explain that setup.
But not a hose Bibb that has both hot and cold hooked up to it?
I'll load a pic. Tell me if it's what you have.
Zoom in to see
Those are Naviens I'm installing now.
At the far bath is it effecting the shower or the sink?
Turn off the cold valves under both the kitchen sink and that bathroom sink and try again. I'll bet it'll work just fine
If it does work then we know you have cold entering the outside at one of those faucets. Most likely the kitchen. Then open the cold to the lav faucet with the kitchen still off and see if it changes. There's is a check valve in most kitchen sinks and it may be stuck with debris from the flushing.
Yes. Send me a pic of it when you get home.
Right here. I'll leave the question open