Trouble Shooting Guide - Rheem RMTEX-04 Instructions D'installation Et Guide D'utilisation

9- TROUBLE SHOOTING GUIDE

Please call or email our customer service and technical support team for any help you may need.
The following table represents some of the most common technical support questions we receive. Before calling
us, please read thoroughly to see if your question or problem is addressed.
PROBLEM
Water heater is not heating at all
(water is flowing 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 flowing 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.
Are you having problems with your water heater?
TOLL FREE 1-(800) 374-8806
POSSIBLE CAUSE
No power or incorrect Make sure the breakers at main electrical panel are ON. You may have a faulty breaker or
wiring. unit may be wired incorrectly.
Flow rate is too low /
Your water heater has an activation flow rate of approximately 0.3 GPM (1.1 LPM). If your
water pressure is too
water flow rate is less than this level, your unit will not activate. Increase the flow rate.
low.
Internal part failure. Please call us for technical assistance.
Depending on your incoming water temperature and the kW of your heater, your water
Flow rate is too high. flow rate may exceed the physical heating capacity of your water heater. Reduce the flow
rate by installing an aerator
If it's a new installation, have your electrician double check the wiring. Is possible that the
Crossed wires.
wiring is incorrect.
The heating elements on your water heater are design for 120 or 240 volts. When used
Voltage less than 120 or
with a lower voltage, they produce less heating power. You may need to upgrade to a
240 volts.
larger input heater.
You do not need to mix as much cold water with your tankless water heater compared to
Mixing too much cold when you use a conventional water heater. You may also have an anti-scald feature on
water. 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 or 240 volts. If you have less than 120 or 240 volts, it
Voltage less than 120 or
may affect the reading on your water heater's digital display and cause it to read slightly
240 volts.
higher than the actual output temperature. To compensate for this, increase the setting on
your water heater if you need / want hotter water.
Anti-Scald Your faucet may have an anti-scald feature or a tempering valve that automatically mixes
pressure/balancing cold water even when you turn your control lever or handle to full hot. These devices are
valve or tempering usually adjustable so you can turn off the cold mix completely. You can compensate for this
valve. 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
Thermal loss due to faucet, some heat will be lost especially if it has long distance to travel or the pipes are
long pipe run cold. This is normal. You can compensate for this by increasing the setting on your water
heater if you need/want hotter water.
Water temperature at Check your flow for too little flow, wrong aerator size, or internal part failure. Call us for
the faucet is too hot technical assistance.
SOLUTION
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