Troubleshooting - Atmor Thermo Pro2 Series Manual

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 POSSIBLE CAUSE
ISSUE
No hot water Power outage or faulty
and display do wiring.
NOT light up
The flow rate needed
to activate the heating
element (0.5 gpm) has not
been reached.
No hot water Reset the unit
and display
DOES light up
Potential internal part
failure
Water is The water flow rate
heated, but not exceeds the heating
hot enough. capacity of the heater.
Voltage less than 240 Volts The heating elements on your water heater are designed for 240
Crossed Wires.
Temperature setting is too
low.
Water pressure is less than
0.5 BAR (7 psi).
Mixing too much cold
water
Thermal loss due to long
pipe run.
Water is Voltage less than 240 Volts The computer chips in your tankless water heater are programmed
heated, but not
hot enough.
16
SOLUTION
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.
Increase the flow rate from the water supply source.
Clean the filter screen on the unit's water inlet.
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.
Please call us for further technical assistance.
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.
volts. When used with a lower voltage, they produce less heating
power. You may need to upgrade to a larger input heater.
If it's a new installation, double check the wiring to confirm that it is
correct.
Increase the temperature setting on the unit.
Make sure the shutoff valve is fully open, and the water supply line is
not blocked.
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.
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.
with the expectation that your incoming line voltage is 240 volts. If
you have less than 240 volts [i.e. 208V or 220V], 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 or want
hotter water.