Controller issues onlyThis area is for qualified personal only
Note: Pump ON = Roof sensor °C minus Inlet sensor °C (differential value when the solar pump will turn ON). Pump OFF is similar to Pump ON except is the turn off differential.
Pump on at nightClick on flow diagram to the right for logical troubleshooting.
Usually a reverse thermosiphon issue, the one-way valve or back flow prevention fails.
Pump not turning offBeware a 'Pump Off' value that is too low. Min 2°C for pools, 3°C for solar hot water
No solar harvesting yet sun is shiningUsually water has stopped flowing in the solar loop
Pump acting strangeUsually normal for stagnation recovery behaviour
Suspect Sensor temperature readingsUsually a broken or insulation stripped cable. Might not be visible externally.
Ensure sensor cables are securely fastened and protected from damage