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INSTALLATION
COMMISSIONING
11. Commissioning
DANGER: Electrocution
Commissioning must only be carried out by an authorised
contractor in accordance with safety regulations.
!
Damage to the appliance and the environment:
Open hot water faucet for a few minutes until water fl ow
is continuous and all air is purged from water pipes. The
appliance’s plastic cover must be installed before the circuit
breaker is turned on.
Turn on circuit breaker to bring electrical power to the
appliance.
Turn the temperature selector clockwise and anti-clockwise, to
calibrate the temperature selector.
Adjust the water temperature to the desired level using the
knob on the front cover of the appliance.
Turn on hot water and wait twenty seconds until temperature
has stabilized.
Check the water temperature with your hand and make sure
that it does not feel too hot. Reduce temperature if this is
necessary.
Explain to the user how the appliance works and familiarise
him or her with its use.
Advise the user about possible hazards (hot water temperature
up to 140 °F (60 °C). Hand over these instructions, to be kept
for future reference.
A setting of 110°F (43°C) is recommended when the MegaBoost
is installed on the outlet of the tank. When installed on the tank
inlet, a setting of 120°F (49°C) is recommended.
11.1 Appliance
handover
Explain the functions of the appliance to the user. Draw special at-
tention to the safety information. Hand the operating and installation
instructions to the user.
12. Troubleshooting
DANGER: Electrocution
To test the appliance, it must be supplied with power.
12.1 Display options LED diagnostic „traffi c lights“
Display options
red
illuminates in case of faults
yellow
illuminates when the appliance is heating water
green
flashing: The appliance is supplied with power
1
26
_0
2
_02
_1
0
8
8
1 LED diagnostic “traffi c lights“
12.2 Fault
table
Symptom
Possible Cause
Solution
No hot water
circuit breaker off
safety thermal cut-out
tripped
turn circuit breaker on
reset thermal cut-out
not enough flow rate to
activate appliance
clean filter screen at appliance
clean faucet aerator or shower
head
Not enough hot water filter screen clogged
clean filter screen at appliance
Water not hot enough
water flow too high
reduce water flow rate until
light on front cover stops blin-
king
supply correct voltage to ap-
pliance
If you are not able to resolve a problem please contact us, see
last side, before removing the appliance from the wall. STIEBEL
ELTRON is happy to provide technical assistance. In most in-
stances, we can resolve the problem over the phone.
13. Normal maintenance
STIEBEL ELTRON tankless water heaters are designed for a very long
service life. Actual life expectancy will vary with water quality and
use. The appliance itself does not require any regular maintenance.
However, to ensure consistent water fl ow, it is recommended to
periodically remove scale and dirt that may build up at the aerator of
the faucet(s), the fi lter screen in the appliance, or in the shower head.
