26
Malfunctions
Fault finding list for troubleshooting
High water level not yet reached – High-level alarm
Fault:
The electrode tip is too long.
Remedy:
Cut electrode tips to the length required for the high level switchpoint.
Fault:
The electrode tip has earth contact.
Remedy:
Change installation position.
Fault:
Thermal fuse has been triggered.
Remedy:
The ambient temperature must not exceed 70 °C.
Fault:
The internal insulation of the electrode rod is damaged.
Remedy:
Replace level electrode.
High water level reached – no function
Fault:
Mains voltage not applied.
Remedy:
Apply mains voltage. Connect electrode according to wiring diagram.
Fault:
The electrode tip is too short.
Remedy:
Remove electrode tip. Install new electrode tip and cut it to the length required for the high
level switchpoint.
Fault:
The electrode housing does not have earth connection to the boiler.
Remedy:
Clean seating surfaces and insert metal joint ring (of stainless steel 1.4301)
D 27 x 32 to DIN 7603. Do
not
insulate level electrode with hemp or PTFE tape.
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 item) are closed.
Remedy:
Open isolating valves.
Equipment fails to work – Indication of a malfunction
Fault:
In spite of correct wiring and commissioning of the equipment an interference signal
is indicated.
Remedy:
The interference signal is caused by H. F. interferences coming from the installati-
on. For interference suppression of the voltage supply we supply ferrite rings, stock
code 147253. The 230 V supply lines should be looped through the ferrite ring five
to ten times. If several controllers are used in the system, they can be fed from the
interference suppressed supply lines. For the interference suppression of the bus
line we supply hinged-shell ferrite rings, stock code 147254. The hinged-shell
ferrite rings are clamped onto the bus line close to the terminal strip of the
controller.
If faults occur that are not listed above or cannot be corrected, please contact our service centre or
authorized agency in your country.
Summary of Contents for NRG 16-41
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