Operation manual of solar controller SR658
Page 99 of 105
Display is always closed
Press button on the right side, display is lighted?
No
Yes
Controller is in standby status,
it is normal
Checking the power connection, does controller have power?
No
Yes
Checking the wire, connected it
Fuse of controller is broken,
open the housing of
controller, and a backup fuse
is put on the slot, and replace
a new fuse.
Pump is overheated, but no heat transfer from the collector to the tank, flow and
return have the same temperature; perhaps also bubbling in the pipes
Air or gas bubbles in the system?
No
Yes
Vent the system; increase the
system pressure to a static
primary pressure of at least
plus 0.5 bar; if necessary
continue to increase pressure;
switch the pump on and off for
a short time.
Is the collector circuit blocked at
the dirt filter?
Clean dirt filter
