STIEBEL ELTRON SOM 7 SI - Manual (Page 25)

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SOM 7 SI
5. Troublesooting Tips
If a malfunction occurs, it will be indicated on the display of
the controller:
Operating control lamp
Warning symbol
1 2
S1 S2 S3
3 4 5 6
Temp. Sensor Pt1000
L N R1 N R2 N
20 19 18 17 16 15
S4
7 8 14 13 12
DE - 45527 Hattingen
DeltaSol BS Plus
2 (1) A 115
2 V~
(1) A 115 V~
R1
R2
T4A
115 V~
CU 72060171 01
UL 60730-1A:2002
CSA E60730.1:2002
VBus
9 10
°F Ω °F Ω
14 961 131 1213
23 980 140 1232
32 1000 149 1252
41 1019 158 1271
50 1039 167 1290
59 1058 176 1309
68 1078 185 1328
77 1097 194 1347
86 1117 203 1366
95 1136 212 1385
104 1155 221 1404
113 1175 230 1423
122 1194 239 1442
Resistance values of the
Pt1000-sensors
Symptom Possible Cause and Remedies List
Operating control lamp flashes red. The
symbol is displayed and the symbol is flashing.
The indication channel of the relevent sensor
displays 888.8 instead of the temperature.
SOM unit is sensing an open circuit condition.
Measure the resistance between the two terminals to which 1.
the relevent sensor is attached. If it measures infinite resis-
tance continue to step 2. If it measures a resistance within
range of the above chart, call for service.
Disconnect the sensor wire from the terminals and measure
2.
the resistance between the two wires. If it still measures infi-
nite resistance continue to step 3. If it measures a resistance
within range of the above chart, there is a problem with the
connection from the sensor wire to the terminal.
This problem lies either with the sensor or the wire/connec-
3.
tions. In order to determine whether the problem lies with
the sensor itself, the sensor must be disconnected from any
extension wire and its resistance must be measured. If, when
the sensor is disconnected, the resistance is measured to be
within the values of the resistance chart the problem is with
the extension wire/connections.