22
Malfunctions
continued
Fault finding list for troubleshooting
continued
Fault:
The thermal fuse has been triggered.
Remedy:
The ambient temperature must not exceed 70°C.
Fault:
The LED
I
does not light up. No data exchange.
Remedy:
Check level switch NRS -42. Connect electode according to the wiring diagram.
The equipment fails to work – no function
Fault:
LED “Power” does not light up.
Remedy:
Apply mains voltage. Wire equipment according to the wiring diagram.
Switchpoints reached / level below switchpoints – no function
Fault:
The electrode housing does not have earth connection to the boiler.
Remedy:
Clean seating surfaces and insert metal joint ring (of stainless steel .430) 33 x 39 to
DIN 7603. Do
not
insulate compact system with hemp or PTFE tape!
Fault:
The electric conductivity is too low.
Remedy:
Set sensitivity of level switch NRS -42 to
≥
0.5 µS/cm.
Fault:
The isolating valves of the external measuring pot (optional) are closed.
Remedy:
Open isolating valves.
Fault:
The vent hole in the protection tube does not exist, is obstructed or flooded.
Remedy:
Check protection tube and, if necessary, provide vent hole.
Fault:
The electrode rods have earth contact.
Remedy:
Change installation position.
Fault:
The switching function has not been correctly allocated. Electrode rods have been cut
to the wrong size.
Remedy:
Identify electrode supply wire and reconnect the circuit board in the terminal box
accordingly.
Switchpoints reached / level below switchpoints – incorrect function
If faults occur that are not listed above or cannot be corrected, please contact our service centre or
authorized agency in your country.
Fault:
The internal seal of the electrode rod is damaged.
Remedy:
Replace level electrode.