A list of things to check if you get Error Message 137 on your Apollo 700 or Apollo 2 800, including:

  • Solarsens number check
  • RF Receiver check
  • RF Antenna check
  • Software check
  • Solar panel power check


The full instructions with images and diagrams are included in the PDF document.

WARNING: Any maintenance work undertaken on a James Heal instrument must be done so by a trained and competent person. Where electrical work is detailed, this should only be completed by a qualified engineer. James Heal is not responsible for damage or injury arising from work carried out by any person not qualified to do so. If in doubt, please contact James Heal or your local James Heal Agent.


If you require further support on this issue, our Service & Calibration Engineers will be able to help. Either submit a ticket here, or contact your local James Heal representative for further support.