STIEBEL ELTRON SOM 7 SI - Manual (Page 27)

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SOM 7 SI
Symptom Possible Cause and Remedies List
LED is blinking red and green. Check the Circulator Pump Operating Mode, HNDx. This 1.
should be set to “auto”. If it is set to either “on” or “off” the
unit will flash red and green, the
symbol will flash and the
symbol will be displayed.
If the unit is in its power up mode this condition is normal. 2.
Tank temperature cools excessively overnight. Make sure that the check valve between the upper port of 1.
the lower heat exchanger and the output of the solar array is
installed and functioning properly.
Check all configuration settings (see section 4.2).
2.
Make sure that all system components are properly insulated. 3.
Circulator pump is running, collector is much
hotter than store, but the tank fails to heat up. Make sure that the controller is actually powering the circula- 1.
tor. Is the symbol displayed in the tool bar? If not, check all
configuration settings (see section 4.2). Otherwise continue to
step 2.
HAZARDOUS VOLTAGE PRESENT!
Check for 120 VAC between terminals 17 and 18. If the 2.
symbol is displayed and there is not 120 VAC between these
two terminals, call for service.
Check the system’s flow meter. Is the system getting the
3.
proper voumetric flow rate required by the collectors? If not,
try adjusting the system’s flow adjustment valve (if present).
If the system is getting no flow even though the circulator is
4.
running there is either an obstruction in the collector loop, or
there is air in the system. If the system recently experienced
an overheating condition, the problem is most likely the latter
and the system needs to be purged. There is also a possibility
that the circulator pump itself is defective.