FAULT FINDING
6 720 643 603 (2011/11)
23
Solar cylinder is cooling rapidly.
High heat loss. Tank insulation is faulty or not correctly
fitted.
Check insulation. Insulate the cylinder
connection points.
Controller setting for backup heating is
not correct.
Check settings of boiler controller.
Single-pipe circulation (micro-circulation
in the pipelines).
Instal a "U" bend in the pipe to prevent heat
convection.
Gravity circulation via collector array or
DHW recirculation line or backup heating.
Check gravity brakes.
Hot water recirculation running too
frequently and/or at night.
Check programmed on/off times and cyclic
mode.
When sun is shining on collectors, the collector glass is fogged for a long period of time.
Condensation water
in the collector.
Insufficient ventilation of the collector. Clean ventilation openings.
System performance is falling.
Solar yield too low. Collectors are under shade. Remove shade.
Air in the system.
Bleed or purge the system.
Pump is running at decreased power.
Check the pump.
Heat exchanger dirty/calcified.
Wash/decalcify the heat exchanger.
Collector glazing is very dirty.
Clean the collector glazing with a glass-
cleaning agent (no acetone).
Backup heating is running despite good solar irradiation.
Solar yield too low. Storage cylinder temperature sensor for
backup heating is faulty or incorrectly
positioned.
Check storage cylinder temperature sensor
position, mounting and characteristics.
DHW recirculation is incorrectly
connected or switched on for too long.
Check recirculation connection; if necessary,
reduce switch-on time for recirculation.
Backup heating temperature set too high.
Check settings.
Air in the system.
Bleed or purge the system.
Controller faulty.
Check controller, replace if necessary.
Type of fault
Effect Possible causes Remedy
Tab. 11
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