A.O. Smith HYB-90N Problem, Possible Causes, What to do, When The Tap Is Opened, the display

Problem	Possible Cause(s)	What to do
WHEN THE TAP IS OPENED,	a.The hot water fixture is not	Check if there is any error code on
THERE IS NO HOT WATER OR THE	sufficiently open to draw the water	the display.
HOT WATER TURNS COLD AND	through the heater.
STAYS COLD.	b.The unit display is an error code.
	c. There is an external recirculation
	system installed, or there is a
	check valve on the recirculation
	return line.
	d.Improper sized dip tube.
	e.Water heater disconnected from
	electrical power.
THE WATER IS NOT HOT	The temperature is set too low.	a.Check unit’s temperature setting.
ENOUGH.		b.Check for cross plumbing between
		cold and hot water lines.
THE WATER IS TOO HOT.	The temperature set too high.	Check unit’s temperature setting.
CANNOT OPEN DOOR.	Door pins locked in place.	a.Ensure the door lock is unlocked
		b.Ensure the top and bottom door
		pins are released by using a small
		screwdriver to pry the pins in the
		direction of the door opening.
	TABLE 6

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