Troubleshooting - Black & Decker BD-24-DWH 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
Power outage or
No hot
water and faulty wiring.
display do
NOT light up
The flow rate needed
to activate the heating
element (0.5 gpm) has
not been reached.
No hot Reset the unit
water and
display
DOES light
up
Potential internal part
failure
The water flow rate
Water is
heated, exceeds the heating
but not hot capacity of the heater.
enough.
Voltage less than 240
Volts
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.
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.
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.
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.