Installation Guide

OPERATION
Troubleshooting
16 | Accelera® 220-300 E www.stiebel-eltron-usa.com
7. Troubleshooting
Problem Cause Remedy
No hot water is
available.
No 220-240 V power to
the appliance.
Check that the appliance is
connected to the 220-240 V
power supply.
The circuit breaker in the
electric panel has tripped.
Check whether the circuit
breaker in the electrical panel
has tripped. If required, dis-
connect the appliance from
the power supply and replace
the circuit breaker. Contact
your contractor if the circuit
breaker blows again after the
appliance is connected to the
power supply.
The air intake or air dis-
charge of the appliance is
blocked.
Check the air intake grille
and air discharge grille for
contamination. Remove
any contamination (See 15,
“Maintenance and cleaning”,
pg. 27). Check thermostat
setting.
The ambient temperature
exceeds the upper ap-
plication limit (See 16.3,
“Data table”, pg. 33).
The appliance safety
equipment has responded
and the appliance has
switched off automati-
cally.
Wait for the appliance to cool
down. Call a qualified con-
tractor if the appliance does
not switch back on automat-
ically.
The ambient temperature
falls below the lower ap-
plication limit (See 16.3,
“Data table”, pg. 33).
The evaporator is current-
ly being defrosted.
Wait until the appliance
switches back on automati-
cally.
The appliance is
not heating the
DHW tank although
the heat pump
symbol is illumi-
nated.
The blocking time for
compressor has not
yet elapsed. Once the
compressor has been
switched off, it will only
be switched back on
again after the 20minute
compressor blocking time
has elapsed.
No action required.
The safety valve
of the cold water
supply line is drip-
ping.
These units are under
water mains pressure.
During the heat-up pro-
cess, expansion water will
drip from the safety valve.
Ensure that adequate
expansion volume was in-
stalled in the DHW loop.
Notify a qualified contractor if
water continues to drip when
heating is completed. Check
the sealing of the P&T valve if
a sand filter is used. If expan-
sion volume is too small, in-
stall a larger expansion tank.
The condensate
drain drips.
The surface temperature
of the evaporator is lower
than the dew point tem-
perature of the ambient
air. Condensate forms.
The amount of condensate
depends on the air humidity
level.
The room tem-
perature drops too
low.
Due to the heat pump
process the room tem-
perature drops.
The temperature drop de-
pends on the hot water
demand and the size of the
installation room. If the
temperature drop of the in-
stallation room is more than
7°F (4 °C) check the size of the
installation room.
Problem Cause Remedy
Service symbol
is continuously
illuminated.
See 7.1, “Fault codes”,
pg. 17
Notify a qualified contractor.
Service symbol
flashes and the
water does not
heat up.
See 7.1, “Fault codes”,
pg. 17
It is imperative that you notify
a qualified contractor.
The heat pump
symbol is
illuminated but the
compressor is not
running. The fan is
running.
The appliance is in defrost
mode.
No action required.
The “heat pump”
symbol is flashing.
There is a demand for
heat, but the compressor
is blocked from starting.
No action required. The
compressor is blocked for 20
minutes from starting again
after it has been switched off
in normal operation. The com-
pressor switches itself on au-
tomatically after the 20 minute
blocking time has elapsed.
The symbol stops flashing au-
tomatically.
The “electric
emergency/
booster heater”
symbol is flashing.
A temperature control-
ler has switched off the
“electric emergency/
booster heater” during
rapid heat-up.
No action required. The ap-
pliance continues the rapid
heat-up process using the
heat pump. The symbol stops
flashing when the controller
releases the “electric emer-
gency/booster heater”. The
symbol goes out when the
temperature throughout the
DHW cylinder reaches the set
temperature of 149 °F (65 °C).