Nortec GS Series - Manual (Page 81)

GS Series Installation | 78
FCF Once every 24 hours (provided the unit is
powered and in an operating or standby
condition) the controller will test the water
level detection circuit. If the test fails this
fault is displayed.
(1) Ensure the proper operation of the fill valve and
drain valve via the diagnostics screen.
(2) Float board is defective.
(3) Consult factory.
WLF If the controller detects two or more float
level readings, which are not expected (ex.
Switch 1 and 3 ON or switch 1, 2, and 3
ON) this fault will be recorded.
(1) Miswired float board.
(2) Defective float board.
(3) Consult factory.
FDF The controller monitors the water level as it
fills and drains. It expects to see the levels
increase logically (1-2-3-4-5). If the water
level increases and jumps a step (1-2-4-5)
this fault will be generated. The same holds
for water level decreasing.
(1) Float board defective.
(2) Contact agent for replacement float board.
KWF During a keep warn cycle, if the tank
temperature sensor does not open within a
certain time window, this fault is generated.
(1) Ensure that the tank temperature sensor is
connected.
(2) Defective tank temperature switch.
(3) Contact agent for replacement switch.
OTF If input TB5, # 4 on the logic board goes
low (no 24 Vac detected) this fault will be
generated. This could indicate either the
tank over temperature switch has opened
or the stack over temperature switch has
opened.
(1) Do not operate and consult the factory.
HMF In the user menu the user sets the
maintenance time. Once this time expires a
warning is displayed. 72 hours later the
warning changes to this fault. The
maintenance time is measured in weighted
operational hours.
With switch 5, #4 deactivated, this fault is
enabled.
(1) Perform tank cleaning and all other maintenance
requirements outlined in the manual.
FTF Fill time-out fault during fill process. The
GS software monitors the changes in water
level during filling sequence. If ware level
changes do not occur within an expected
time interval, this fault will be generated. (1) Verify water supply is open.
(2) Verify adequate water supply to unit (30-80psi,
10L/min, minimum ½” dia. Line size).
(3) Verify wire harness and connection between float
chamber and I/O board (TB).