STIEBEL ELTRON SOL 25 PLUS - Manual (Page 65)

WWW.STIEBEL-ELTRON-USA.COM SOL 25 PLUS | 65
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9. MAINTENANCE ANd CARE
10. TROUBLEShOOTINg
Specialists should carry out an annual inspection of the solar heating system to ensure proper functioning of the system and its components,
including the control unit, safety equipment, and tank. System components (fittings, thermal insulation, mounting hardware, fasteners, etc.)
exposed to the weather must also be checked periodically for their condition. Look for signs of abrasion, wear, corrosion, contamination, or
damage. Check the pH value (> 7) and frost protection level (< -20°F) of the heat transfer medium annually.
Refer to the table below for general fault identification troubleshooting.
Fault Cause Remedy
Fault/error message at the controller. System fault; sensor faulty or incorrectly connected. See installation and operating instructions for the
controller.
Pressure fluctuations in the system immediately after
commissioning. Air pockets in the solar circuit. Vent the system again.
Collectors mist up.
Moisture ingress during storage.
Overnight condensation of humidity during certain
weather conditions.
The internal mist will evaporate after a few weeks in
operation by moisture progressively escaping through the
integral ventilation slots.
Moisture will usually evaporate; persistent misting may
require the addition of weep holes in the bottoms of
collector pans.
The pump does not run, even though the collector is
warmer than the tank (neither motor noise nor
vibrations are discernible).
Maximum tank or collector temperature exceeded.
Indicator lamp or display at the controller activated.
No electrical power.
Excessive temperature differential (>30°F) selected or
the controller does not work.
Pump shaft blocked.
Pump contaminated.
Sensor faulty or incorrectly installed.
The controller has shut down correctly and restarts again
automatically when the actual temperatures drop below
their selected maximum temperatures.
Check cables and fuses.
• Check the controller.
• Check the temperature sensor. Make sure sensor has
been mounted to the outlet pipe of the collector(s).
• Reduce the temperature differential.
Briefly switch over to max. speed or insert a screwdriver
into the slot and turn manually.
Dismantle and clean the pump. Close the throughput
limiter and pump ball valve.
• Make sure sensor has been mounted on the (hot) outlet
(not inlet) pipe of the collector.
• Check the sensor position, installation and resistance
curves; the collector sensor must be securely and fully
inserted into the sensor well.