Complaint
Cause and correct
Complaint
Cause and correct
Not powering
Red LED flashing
up.
6 times after start
start up procedure
has finished.
Red LED flashing
7 times after start
start up procedure
has finished.
Not working
High airflow
would usually
but no
suggest that it
discharge to
has at sometime
atmosphere.
functioned
correctly.
Noise.
Low airflow
but fan speed
high.
Ensure mains power to unit.
The green LED should flash.
Ensure unit hasn’t been
switched off or isolated and
that the local fuse hasn’t blown.
Ensure unit hasn’t been
switched off or that the local
fuse hasn’t blown.
LED flash but fan doesn’t run
signifies a motor failure,
replace the fan internal.
If electricity present, power off,
wait and power on again – this
may restart the unit.
Impeller fouling case.
Replace internal.
Contaminated impeller causing
an out of balance. Lightly brush
away excess dirt taking care
not to disturb balance weights.
Unit not mounted on a flat
surface causing distortion,
adjust fixing.
High system pressure, causing
unit to run at high speed to
obtain duty selected. (see right).
Fan is unable to achieve the
duty required. Excessive system
pressure. Adjust set point and
press the calibrate button.
Check for blocked/crushed
ductwork, closed air valves,
blocked external air bricks/
grilles etc. Ensure pressure pipe
from the blower is correctly
attached to the pressure switch.
Motor failure - replace internals
Low system pressure:
• Ensure all ducting is
connected from fan to
atmosphere.
High system pressure,
check for:
• Dirty filters
• Backdraught shutters
jammed shut
• Blocked outlet grilles.
• Long ducted runs
• Twists, bends or crushed
flexible duct work
2
GUIDANCE NOTES 10
Technical Support Dept.
T. 02920 858585 F. 02920 858586
ES-MEV
- Hints & Tips
Leaflet Number 671414 January 2010
0.01
2.0 On Maintenance
2.1
Motors contain sealed for life bearings, no
lubrication is necessary.
2.2 A washable filter is fitted, we recommended
that all unit filters are inspected and cleaned
(wash in light detergent and dry before
refitting) after the first six months and
determine the maintenance frequency there
after by the rate and type of contamination.
2.3 Lightly brush excess dirt from unit cases and
fan impellers taking care not to disturb
impeller balance weights – if washing is
necessary apply a light detergent and dry.
3.0 On Spares
Should a defect arise during installation or ‘setting
to work of the unit. Firstly isolate the unit and re
apply the power after 10 seconds. Check all wiring
is correct and no boost signal is present. If a fault
still exists, in the first instance please call our
technical department on 029 2085 8585.
The internal parts are exchangeable and can be
removed as a whole component or if necessary it
is possible to replace the main PCB.
Component Spares
Part No.
Complete internal fan/control assembly 774941-P
Dial a duty PCB
830178
Filter 070784
4.0 Trouble Shooting
Complaints are generally that the unit is ‘not
working’ so it will be first necessary to distinguish
between an electrical/mechanical malfunction or
whether the unit operates but simply fails to
extract air. (see table below for possible problems
and corrective procedures).
