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Notes to system user:
Please also refer to the instructions provided for the individual components connected. If it is
not possible to rectify a fault, please inform your specialist contractor.
Fault
Desired flow
temperature not
achieved
System pressure too
low
Flow rate not correct
Safety valve has
responded
3062815_201508
Faults - Causes - Remedies
Possible cause
• Flow rate set too high or
• No flow
• Too little insolation or too
little absorber area
• Leakage and loss of fluid
• Faulty DEV or incorrect
pre-charge pressure
• Safety valve has
responded
• Faulty pump
• Shut-off valve
• Flow rate is dependent on
temperature (viscosity)
• Collector temperature
too low/too high
• Faulty sensor
• Expansion vessel faulty or
wrongly sized
Remedy
• Note the relationship between the flow rate and the
temperature spread between flow and return; check and
reduce the flow if necessary.
• Have a specialist contractor check the sizing of the
system.
• Check pipework for leaks.
• Notify your specialist contractor.
• Observe installation instructions for pump and pump
assembly.
• Check/open all shut-off valves.
• At low temperatures the flow rate can fall below the set
value and at high temperatures may exceed it. This is
not a fault.
• Observe the installation instructions for the control unit
and check the collector temperature displayed.
The pump is only activated if the solar yield is sufficiently
high, and switches off when the maximum cylinder
temperature is reached.
• Notify your specialist contractor.
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