What to check if the solar pump is not operating?

If the pump station on a Grant Solar Thermal System is not operating, heating engineers should check for the following:

1. No electrical supply to the pump

  • Controller is not calling for pump to operate
  • Check power supply to controls (at fused spur)
  • Check wiring to controller and pump is correct
  • Check for any loose connections

2. Controller is not calling for pump to operate:

  • Check controller settings and correct if necessary (please refer to instructions supplied with the Solar Controller for further support)
  • Collectors may be in stagnation mode - if so, wait for the system to cool down
  • Collector temperature may be too low (caused by insufficient solar radiation)
  • Cylinder temperature setting may be satisfied

3. Pump is stuck

Turn off the power, locate the de-blocking screw on pump motor and rotate the motor using a screwdriver.

4. Motor capacitor failed

If this has failed, please replace the capacitor or pump motor.

Find Technical Specifications

Download product brochures, data sheets and installation manuals for all of Grant's oil boilers and renewable technologies.

Find technical specs

Home Heating Blog

Discover more about home heating solutions, care and support with our informative blogs

Read more

Couldn't find what you were looking for?

Alternatively you can speak to a member of our team - Subject to Operating Times

Return to top
Are you a homeowner? Please click here.