16
13
.
Troubleshooting
Before calling for service, check the troubleshooting list of common issues.
If you are unable to resolve a problem, contact your locally authorized distributor.
PROBLEM
ISSUE
POSSIBLE CAUSE
SOLUTION
No hot
water and
display do
NOT light up
Power outage or
faulty wiring.
Check the power supply. Check the circuit breakers.
Make sure the breakers at main electrical panel are ON.
You may have a faulty breaker or unit may be wired
incorrectly.
Make sure the shutoff valve on the unit’s incoming water
supply line is fully open.
The flow rate needed
to activate the heating
element (0.5 gpm) has
not been reached.
Increase the flow rate from the water supply source.
Clean the filter screen on the unit’s water inlet.
No hot
water and
display
DOES light
up
Reset the unit
Refer to manual (Page 18) for diagram of reset points.
Make sure to shut all power on your breaker panel
before attempting to reset unit. All resets must be
pressed.
Potential internal part
failure
Please call us for further technical assistance.
Water is
heated,
but not hot
enough.
The water flow rate
exceeds the heating
capacity of the heater.
Reduce the water flow rate at the faucet or slightly close
the shutoff valve on the unit’s incoming water supply line
to reduce the water flow rate.
Voltage less than 240
Volts
The heating elements on your water heater are designed
for 240 volts. When used with a lower voltage, they
produce less heating power. You may need to upgrade
to a larger input heater.
Crossed Wires.
If it’s a new installation, double check the wiring to
confirm that it is correct.
Temperature setting is
too low.
Increase the temperature setting on the unit.
Water pressure is less
than 0.5 bar (7 psi).
Make sure the shutoff valve is fully open, and the water
supply line is not blocked.
Mixing too much cold
water
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.
Thermal loss due to
long pipe run.
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
increasing the setting on your water heater if you need/
want hotter water.
Summary of Contents for AT-910-18TP
Page 20: ...Notes P N 196183J ...
