Instructions / Assembly

OPERATION
Troubleshooting
18 | Accelera® 220-300 E www.stiebel-eltron-usa.com
Problem Cause Remedy
Service symbol
is continuously
illuminated.
See 7.1, “Fault codes”,
pg. 18
Notify a qualified contractor.
Service symbol
flashes and the
water does not
heat up.
See 7.1, “Fault codes”,
pg. 18
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).
7.1 Fault codes
If the service/fault symbol is flashing or continuously illuminated
on the display, you can call up a fault code.
Repeatedly press the menu key until the
fault code is shown following the “chang-
ing units” menu.
Fault code appears
7.1.1 Fault code menu 1
Fault
code
Service
symbol
Fault description Remedy
0 No fault
2 contin-
uously
illumi-
nated
The dome sensor has failed.
The temperature displayed
is measured by the integral
sensor. The appliance will
continue to work properly but
the amount of mixed water will
read as less than 2 gallons.
Call Stiebel Eltron for
more information if this
error occurs.
4 contin-
uously
illumi-
nated
The integral sensor has failed.
The mixed water display will
not show the correct amount
but the appliance will continue
to work properly.
Call Stiebel Eltron for
more information if this
error occurs.
6 flashing Dome sensor and integral sen-
sor failed. The appliance stops
heat delivery.
Contact a qualified con-
tractor.
8 flashing The appliance has recognized
that the DHW tank is not heated
for 13 hours, despite there
being a demand.
You can continue to use
the appliance by activat-
ing backup mode. See
5.5.2, “Emergency back
up mode”, pg. 16. Call
Stiebel Eltron for more
information if this error
occurs.
16 contin-
uously
illumi-
nated
Short circuit impressed current
anode / protective anode failed
Immediately inform a
qualified contractor, as
the appliance is not pro-
tected against corrosion
if the impressed current
anode is faulty.
32 flashing
The appliance is operating with
an empty tank or the appliance
is not delivering heat.
Fill the appliance with
water. The fault code dis-
appears and the appliance
starts.
The anode current is inter-
rupted. The appliance does not
heat up.
The contractor needs to
check the connection of
the impressed current
anode and the internal
wiring.
128 contin-
uously
illumi-
nated
No communication between
controller and display. The
most recently selected set val-
ues are active.
Check the connection be-
tween the display and the
control board.
256 flashing Manually activated Emergency
backup mode (only electric
booster element active).
See 5.5.2, “Emergency
back up mode”, pg. 16.