17
Sales/Spares & Replacement Help Line 01604 762881
JS9/10 SWITCH NOT WORKING
ONE OR BOTH FANS NOT BOOSTING
FANS NOT RUNNING
NO
YES
YES
YES
YES
YES
YES
BOTH
NO
NO
NO
YES
YES
NO
YES
NO
ONE
NO
BOTH
NO
NO
NO
NO
ONE
NO
YES
YES
YES
NO
One or both fan/s not boosting when both are required to boost?
Only one fan running.
Make sure there is no mains across TB1 2 & 6 i.e. No switched live & unit is not in installer mode (LED indicator should not be flashing)
With bathroom light or boost switch on:
Is there mains present across terminal block 2 & 6
also across SL & N on right side of PCB?
Remove yellow of affected fan, labelled 7 or 8 and
touch 10 V terminal screw on PCB Does fan now run
at a fast speed?
Rotate switch from auto to 2. Do fans speed up?
Is switch 3 of dip switch in the on position?
Ether faulty PCB faulty
or wires between
terminal block 1 and
PF1 or PF2 of PCB.
There should be at
least 1 V DC present
on PF1 or PF2. If not
replace PCB.
If in off position there will be a 2 minute delay
before fan/s will boost.
Open circuit between switched live source e.g. bathroom
light switch and the blue and black wires going into the
right hand side vertical terminal block of main PCB.
Make sure link is connected on underside TB3 1 & 2
Either faulty fan or connector.
Physically swap fans to determine what the issue is.
On the switch check voltage across GND and CTA.
Is the voltage approximately 5 V DC?
A fan with 9 to 10 V across TB1 7 & 13 (GND)
should be running at full speed. If not, replace fan.
On the switch, check voltage between GND and EXT. Is the
voltage between 2.4 and 5 V DC depending on RV2 setting ?
Switch 1 of dip switch should
be in the on position.
If fans not speeding up on position
one only then preset RV1 on the rear
of switches requires adjusting.
Remove mains, wait 20 seconds and reconnect mains.
Check fuse & fuse spur
for mains.
Is there 10 V present
across TB1 12 & TB21 13?
Carefully turn RV1 fully clock wise.
Measure DC voltage across TB1 7 & 13
Remove mains cover. Is
there mains going to the fans
connectors?
Is there 10 V DC across blue &
red of fan connector of either
fan
With switched live still enabled -
After 10 seconds press installer button.
Remove red wire from TB1 12
Does 10 V return to TB12A?
Is the voltage at least 9 to 10 V?
Remove mains supply & check continuity from the
fan connectors to PCB. Check screws are tight and
not trapping wire insulation.
One fan could be dragging 10 V DC line down.
Unplug a fan at a time and see is 10 V line is restored.
If so the unplugged fan is faulty. Both fans could have
been damaged if unable to establish 10 V.
Remove mains supply & check continuity from the fan connectors to PCB. Check screws are tight and not trapping wire insulation.
Make sure switch 4 of dip switch in the off position as
that will prevent supply fan from boosting.
Faulty Main PCB
Faulty Main PCB
One fan running
Is there 230 V AC present across TB2 & 4?
5 V DC is supplied from CTA & GND of
PCB Via TB1 13 & 15. Check connections
and cables for an open circuit, insulations
clamped, etc.
Faulty PCB as it’s not detecting switched live
is present across N and SL terminals.
2.4 and 5 V DC (depending on
RV2 setting ) has to go to is EXT &
GND of PCB Via TB1 14 & 13. Check
connections and cables for an open
circuit, insulations clamped, etc.
Either Switch or PCB is faulty or a short between EXT and GND.
Remove EXT wire and recheck voltage.
If voltage goes up then check wiring for shorts.
Check PCB by linking TB1 14 to TB 15
If PCB is working then fans will run at full speed.
15. TROUBLESHOOTING