12
PROBLEM
Water heater is not heating
at all (water is owing but
the unit is not heating - the
outgoing water temperature
is the same as the cold water
supply) - the digital display
does NOT light up.
Water heater is not heating
at all (water is owing but
the unit is not heating - the
outgoing water temperature
is the same as the cold water
supply) The digital display
DOES light up.
Water heater is heating, but
the water temperature is not
hot enough.
The water temperature at the
faucet is less or greater than
the temperature setting of
my water heater.
POSSIBLE CAUSE
No power or incor-
rect wiring.
Flow rate is too low
/ water pressure is
too low.
Internal part failure.
Flow rate is too
high.
Crossed wires.
Voltage less than
120 (3.5 kW) or
240 volts (6.5 kW).
Mixing too much
cold water.
Voltage less than
120 (3.5 kW) or
240 volts (6.5 kW).
Anti-Scald pressure/
balancing valve or
tempering valve.
Thermal loss due to
long pipe run
Water temperature
at the faucet is
too hot
SOLUTIONS
Make sure the breakers at main electrical panel are ON. You may have a
faulty breaker or unit may be wired incorrectly.
Your water heater has an activation ow rate of approximately 0.25 GPM
or .95 (1) LPM. If your water ow rate is less than this level, your unit will
not activate. Increase the ow rate.
Please call us for technical assistance.
Depending on your incoming water temperature and the kW of your
heater, your water ow rate may exceed the physical heating capacity of
your water heater. Reduce the ow rate by installing an aerator
If it’s a new installation, have your electrician double check the wiring. Is
possible that the wiring is incorrect.
The heating elements on your water heater are design for 120 (3.5 kW)
or 240 volts (6.5 kW). When used with a lower voltage, they produce less
heating power. You may need to upgrade to a larger input heater.
You do not need to mix as much cold water with your tankless water
heater compared to when you use a conventional water heater. You may
also have an anti-scald feature on your faucet that is mixing cold water.
These types of faucets can usually be adjusted to reduce the amount of
cold water mixed.
The computer chips in your tankless water heater are programmed with the
expectation that your incoming line voltage is 120 (3.5 kW) or 240 volts
(6.5 kW). If you have less than 120 (3.5 kW) or 240 volts (6.5 kW), it may
affect the reading on your water heater’s digital display and cause it to read
slightly higher than the actual output temperature. To compensate for this,
increase the setting on your water heater if you need / want hotter water.
Your faucet may have an anti-scald feature or a tempering valve that auto-
matically mixes cold water even when you turn your control lever or handle
to full hot. These devices are usually adjustable so you can turn off the cold
mix completely. You can compensate for this by increasing the setting on
your water heater if you need/want hotter water.
As the hot water from the heater runs through the hot water delivery system
to your faucet, some heat will be lost especially if it has long distance to travel
or the pipes are cold. This is normal. You can compensate for this by increas-
ing the setting on your water heater if you need/want hotter water.
Check your ow for too little ow, wrong aerator size, or internal part failure.
Call us for technical assistance.
The following table represents some of the most common technical support questions.
TROUBLESHOOTING GUIDE
Please call or email our customer experience and technical support team for any help you may need.
BRAND CALL EMAIL
Rheem
®
or Richmond
®
800-374-8806 eco.support@eemax.com
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