Problem
The water from the hot
water faucet is cold or
turns cold and stays cold.
The water is not hot
enough.
The water is too hot.
Possible Cause(s)
• Is the cold water inlet filter clean?
• Is the hot water faucet open wide
enough draw at least 0.5 gallons of
water per minute (GPM) through
the water heater?
• Is an error code displayed on the
front panel?
• If there is an external recirculation
system installed, is there a check
valve on the recirculation return
line?
Is the set temperature too low?
Is the set temperature set too high?
What to do
• Clean the cold water inlet filter. See
"4.4 Cleaning the Inlet Water Filter and
Recirculation Inlet Filter" in the Operation
manual.
• Open the hot water faucet completely.
• If an error code is displayed, refer to the
Error Code Guide.
• Check the water heater's temperature
setting. Refer to "3.2 Adjusting the Water
Temperature" in the Operation manual.
• Check for cross plumbing between the
cold and hot water lines.
• Check the water heater's temperature
setting. See "3.2 Adjusting the Water
Temperature" in the Operation manual.
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