32
12-PROBLEMS AND FAULT DIAGNOSIS
Problem
Cause
Solution
The pump does not work even though
the temperature of the collectors
is at least 10 °K higher than the
temperature of the tank. No sound is
perceived from the pump.
There is no supply voltage
Check all of the line and safety cables
(fuses)
The temperature difference for pump
starting is set too high or the adjustment
control unit does not show the pump
activation signal.
• Check the control unit
• Check the temperature sensor
• Reduce the temperature differential
The maximum temperature has been
reached
Check the settings
The pump is blocked by deposits
Enable maximum pump rotation speed for
a short period of time or unlock the rotor.
Place a screwdriver in the gap in the pump
unit and rotate it manually.
The pump is faulty
Replace the pump
The pump is working bit the flow
and return sections are at the same
temperature. The pump is very hot.
There is air in the system. The valves are
closed
• Check the pressure of the system
• Bleed the system fully using the solar
filling station
• Open the valves
The cylinder cools down during the
night; the flow and return sections
are at different temperatures after
the pump is switched off; during
the night the temperature of the
collectors is greater than the external
temperature
The deadweight brakes are not fully closed
(dirt particles)
Check the position of the red and blue
handles. Probable presence of dirt
particles or foreign bodies on the surfaces
of the seal. Dismantle and clean.
The solar intake is unusually low
The pipe insulation is too thin, high heat
loss; neither the temperature nor the
duration of the circulation is controlled.
The system may not have been designed
correctly.
Check the layout of the system (dimensions
of the collectors, shading, length of pipes,
timer clock, hot water consumption)
Summary of Contents for HIGH PERFORMANCE SOLAR COLLECTOR
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