21
Switchpoint “Highlevel alarm” exceeded – no function
Fault:
Mains voltage is not applied.
Remedy:
Switch on power supply and wire equipment in accordance with the wiring diagram.
Fault:
The thermal fuse has been triggered.
Remedy:
In case of a defective thermal fuse the mains voltage has not been applied to terminal
J
.
Discard and replace defective thermal fuse.
Stock code # 052433.
The ambient temperature must not exceed 70 °C.
Remedy:
The electrical conductivity is too low.
Remedy:
Set code switch
5
to
≥
0.5 µS/cm.
Fault:
The electrode body does not have earth connection to the boiler.
Remedy:
Clean seating surfaces and insert metal joint ring
(of stainless steel 1.4301) D 33 x 39 to DIN 7603.
Do
not
insulate compact system with hemp or PTFE tape!
Fault:
Electronic circuit board defective.
Remedy:
Replace circuit board NRV 1-43. Stock code # 321321 (mains voltage 115/230 V AC) or
312338 (mains voltage 24 V AC).
Level below switchpoint “Low level” – no function
Fault:
The electrode tips have earth contact.
Remedy:
Check and, if necessary, change position of installation.
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 isolating valves of the external measuring pot (optional extra) are closed.
Remedy:
Open isolating valves.
Switchpoint has been reached – incorrect function
Fault:
The switching function has not been assigned correctly.
The electrode tips have been cut to the wrong length.
Remedy:
Identify electrode supply wires and reconnect the circuit board accordingly.
Fault finding list for troubleshooting
If faults occur that are not listed above or cannot be corrected, please contact our service centre or
authorized agency in your country.
Troubleshooting