Solar Hot Water Troubleshooting

 
Solar Hot Water Troubleshooting

Controller issues only

This 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 night

Click on flow diagram to the right for logical troubleshooting.
Usually a reverse thermosiphon issue, the one-way valve or back flow prevention fails.




Solar Hot Water Troubleshooting

Pump not turning off

Beware a 'Pump Off' value that is too low. Min 2°C for pools, 3°C for solar hot water






Solar Hot Water Troubleshooting

No solar harvesting yet sun is shining

Usually water has stopped flowing in the solar loop





Solar Hot Water Troubleshooting

Pump acting strange

Usually normal for stagnation recovery behaviour




Solar Hot Water Troubleshooting


Suspect Sensor temperature readings

Usually a broken or insulation stripped cable. Might not be visible externally.
Ensure sensor cables are securely fastened and protected from damage





 
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