Troubleshooting Guide :
Problem
Possible Cause
Suggested Solution
Pump not
coming ON
during good
solar radiation
conditions
Temperature
Sensors not
working properly
●
Check that sensors are installed correctly :
- Are they wired to the correct terminal blocks in the solar
controller
- Ensure wires are secure
●
Check that sensors wires are not damaged
●
Check the Resistance (Ohm) valve of the sensors and confirm
with PT1000 Temperature chart (as a guide 0°C is 1000 Ohm and
100°C is ~1385 Ohm)
Controller
Settings Incorrect
●
Check controller is set to Automatic Operation
●
Check maximum tank and collector settings
Controller Max
Temperature
Setting has been
reached
●
Check maximum tank and collector settings
Pump is
cycling ON
and OFF
during good
solar
conditions
Partial Shading of
Collector
●
Check collector location for possible shading
Excessive System
Flow Rate
●
Reduce flow rate by adjusting restrictor screw on the flow meter
●
Reduce the Pump Speed (Select Slower Speed)
Controller
Settings Incorrect
●
Check if differential (dT function) is correct. dTMin may be set too
high. Trying reducing to 2°C.
Pump is
always ON
even during
minimal solar
radiation
Insufficient Flow
Rate
●
Check flow gauge for proper flow rate
●
Adjust restrictor screw on flow meter
●
Check that all isolation valves are open
Air-Lock in Piping
System
●
Release air from air vent on pumping station
●
Run pump at highest speed setting for a period of time and then
release any accumulated air from air vent on pump station (return
pump speed to normal settings)
Sensor Location
too Low
●
Bottom Cylinder sensor (typically T2) should be slightly above the
level of the solar flow port on the cylinder. If below the flow port,
the pump may run continually.
Controller
Settings Incorrect
●
dTMin may be set too low. Increase by 2 or 3°C.