Specifications

FM774/0708 BOOK 2 32
CM, V, VS, E, EC (TEKELEK) SERIES FAULT FINDING
ELECTRICAL FAULTS
FAULT Ref CAUSE ACTION
1. WALL CONTROL
NOT POWERED
1.1 No mains supply to roof unit. Check mains fuse, circuit breaker &
unit isolation switch.
1.2 Wall control wiring fault. Check all electrical connections.
2. NO RESPONSE FROM
WALL CONTROL
2.1 Fuse blown or circuit breaker tripped. Check for short or earth fault in sys-
tem or arcing in 6-pin motor plug.
FAN FAULTS
FAULT Ref CAUSE ACTION
3. FAN NOT OPERATING
Select ‘FAN’ and fault find as
follows
3.1 No mains supply to roof unit. Check mains fuse, circuit breaker or
unit isolation switch.
3.2 No 240vac supply to wall
Control.
Check all electrical connections.
3.3 Fusible link open circuit or failed. If fan starts but will not continue to
run - replace fusible link.
3.4 Wall control failure -
potentiometer open circuit.
Check for a potential difference of 0v
to 100v between active and control
(depending on pot
position).
3.5 Speed control board failure. If no power out voltage to motor re-
place board.
3.6 Motor not powered. Check continuity through 6-pin
motor plug.
3.7 Capacitor failure - motor will buzz but
not rotate.
Replace capacitor.
3.8 Motor failure or shutdown due to in-
ternal (motor) thermal protection
(thermal overload).
Check run current, if running at more
than 120% of value on motor name
plate - replace motor
3.9 Motor seized. Replace motor.
3.10 Fan jammed in cowling. Centralise fan in cowling.
4. FAN SPEED WILL NOT
VARY
4.1 Min & max speed adjust pots
cancelling each other.
Adjust potentiometers to allow varia-
tion in motor speed.
4.2 Wall control potentiometer fault. Test potentiometer for continuity and
variation & replace if required.