Grundfos AQtap Service Instructions With Installation And Operating Instructions page 24

15.3.2 LEDs in power supply unit
D40
D40
D39
D36
D38
D36
D38
Fig. 1 Power source LEDs
15.4 Fault finding
15.4.1 Warning codes
Code Fault
External communication
015
fault
Site acceptance test not
025
completed
036 Valve leakage
058 Water flow too low
084 Memory fault
157 Time fault
159 SIM card fault
* Disconnect the power supply and the internal battery before replacing the SIM card.
24
D39
Cause
Transaction data upload still not completed
after 48 hours
Site acceptance test (SAT) was interrupted
Solenoid valve is closed, but flow is detected
– solenoid valve is blocked by particles
– solenoid valve is defective
Solenoid valve is open, but flow is too low
SD card error
Real time clock out of order
WMS connection lost
Missing or faulty SIM card
– No SIM card inserted
– Invalid SIM card
– SIM card is PIN protected
LED LED function
LED lights up, when supply voltage for the
D36
solenoid valve is activated. The solenoid
LED valve
valve is supposed to be open.
D38 LED lights up, when the battery voltage is
LED battery sufficient.
D39 LED lights up, when the battery is charged
LED charger with grid power (>110 V).
D40 LED lights up, when the battery is charged
LED solar with solar power.
Remedy
Check SIM card and antenna, and see section
15.5 Mobile connection faults
Restart SAT from beginning, and complete it
– Clean the solenoid valve
– Replace the solenoid valve
Check supply pressure and installation, check
section 15.1 Installation faults
– clean strainer
– in tank systems consider removing the flow
restrictor
Replace control unit
Replace control unit
Check antenna
Check SIM card, see section 15.2 Invalid SIM card
– Insert the SIM card. *
– Replace SIM card by valid SIM card
– Remove the SIM card and disable the PIN
protection. *