STIEBEL ELTRON WWS 20 - Page 13

OPERATION
Troubleshooting
48 | WWS 20 www.stiebel-eltron.com
Problem Cause Remedy
Er36 High pressure
shutdown
Actual value F1 in-
correct
Qualified contractor to check
sensor F1
DHW cylinder not full DHW cylinder filling
Refrigerant circuit Customer support notification
Sludge or scale block-
ing condenser
Clean condenser, replace if nec-
essary
Flow rate too low Check external pressure drops
and compare with a reliable
pressure drop (see chapter "Spec-
ification")
Air in the system Check whether the system has
been vented (see chapter "Com-
missioning/ Filling the DHW
cylinder")
Circulation pump is
jammed
Unjamming circulation pump
Er47 Defrost error Intake air temperature
too low
Set heat pump to "OFF" and heat
domestic hot water temporarily
with immersion heater
Er57 Frost protec-
tion heat source
Intake air temperature
too low
Set heat pump to "oFF" and heat
domestic hot water temporarily
with immersion heater,
Install ventilation flaps
HP symbol flashes Time interval for
testing the protective
anodes has expired
(approx. 1.5-2years)
Test protective anodes and re-
place if necessary, qualified con-
tractor to reset the timer
Messages on the display
CODE Meaning Remedy
E1H Sensor F1 faulty, lead break Sensor checking
E1L Sensor F1 faulty, short circuit Sensor checking
E2H Sensor F2 faulty, lead break Sensor checking
E2L Sensor F2 faulty, short circuit Sensor checking
E3H Sensor F3 faulty, lead break Sensor checking
E3L Sensor F3 faulty, short circuit Sensor checking
E4H Sensor F4 faulty, lead break Sensor checking
E4L Sensor F4 faulty, short circuit Sensor checking
EP Error in parameter memory Appliance disconnection from power
supply then reconnection
Er36 High pressure shutdown Acknowledge error with OK
Er47 Defrost error Acknowledge error with OK
Er57 Frost protection heat source Error is acknowledged automatically
FroS Frost protection DHW cylinder Start immersion heater, if installed
Error is acknowledged automatically
once the fault has been remedied
StOP Power supply utility active See chapter “Operation with external
Cr id Set value increase active signal transmitter”
If you cannot remedy the fault, notify your qualified contractor.
To facilitate and speed up your request, provide the number from
the type plate (000000-0000-000000).
Sensor values
All the control unit temperature sensors have the same charac-
teristics: PTC, type KTY81-121.
Temperature [°C] Resistance [Ohm] Maximum deviation [+/-°C]
-10 739.9 2.1
-9 739.9 2.1
-8 753.0 2.0
-7 759.5 2.0
-6 766.2 2.0
-5 772.8 2.0
-4 779.5 2.0
Temperature [°C] Resistance [Ohm] Maximum deviation [+/-°C]
-3 786.3 1.9
-2 793.1 1.9
-1 799.9 1.9
0 806.7 1.9
1 813.6 1.8
2 820.5 1.8
3 827.5 1.8
4 834.5 1.8
5 841.5 1.8
6 848.6 1.7
7 855.7 1.7
8 862.8 1.7
9 870.0 1.7
10 877.2 1.6
11 884.5 1.6
12 891.8 1.6
13 899.1 1.6
14 906.5 1.5
15 913.9 1.5
16 921.3 1.5
17 928.8 1.5
18 936.3 1.5
19 943.9 1.4
20 951.5 1.4
21 959.1 1.4
22 966.8 1.4
23 974.5 1.3
24 982.2 1.3
25 990.0 1.3
26 997.8 1.3
27 1005.7 1.4
28 1013.6 1.4
29 1021.5 1.4
30 1029.4 1.4
31 1037.4 1.5
32 1045.5 1.5
33 1053.5 1.5
34 1061.7 1.6
35 1069.8 1.6
36 1078.0 1.6
37 1086.2 1.6
38 1094.5 1.7
39 1102.8 1.7
40 1111.1 1.7
41 1119.5 1.8
42 1127.9 1.8
43 1136.3 1.8
44 1144.8 1.9
45 1153.3 1.9
46 1161.9 1.9
47 1170.5 1.9
48 1179.1 2.0
49 1187.8 2.0
50 1196.5 2.0