6. Troubleshooting
Use the table below to help remedy the problem.
Any actions requiring opening the immerSUN and/or testing voltages should only be carried out by a
competent person. Contact your installer if in doubt.
Symptom Possible Cause Action
Unit dead, no display MCB Tripped Check MCB is ON
Wiring to IN and OUT terminals
swapped
Check supply voltage on IN terminal
Internal Fuse Blown Test fuse inside immerSUN
Will not complete setup
Heater Not Detected
No load was detected during
setup
Check the immersion heater is switched on at the
isolator, check the thermostat is closed (water may
already be hot). Otherwise there may be a fault with the
immersion heater element, check the resistance of the
element.
Will not complete setup
Clamp Current Too Low
Import power too low during
setup
Check that the inverter is still switched off, check that
the heater thermostat is closed, check the clamp
correctly fitted, (the clamps needs to 'see' the exported
power to the grid).
Showing Water Hot even though
the water is cold
No load present on OUT terminal Immersion heater isolator should be ON
Check immersion heater thermostat is not open
Immersion heater element could be open-circuit
Always showing Waiting... PV system not generating
sufficient power
Wait for PV system power increase or reduce demand
by switching off appliances
Problem with signal from clamp Check clamp is fitted to correct cable
Check clamp wire connections to terminals
Heating water at full output even
when PV is not exporting
Clamp reversed The clamp has been reversed,
the settings will need to be reset to reconfigure the unit.
(See section 4.3 Reset Settings)
Slave device status not showing on
master display
Communication link wires not
properly connected
Check continuity of communication wires to terminals A
& B
Address conflict Check DIP switch positions
Slave status screen not showing
when Cascade Mode is enabled
Cascade Mode not enabled on
master
Check Cascade Mode is enabled in installer menu
Address settings incorrect Check DIP switch positions
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