Troubleshooting
FAULT POSSIBLE CAUSE REMEDY/ACTION
Unit not operating -
Power Off.
Main/local isolator off Check all isolators from mains to unit.
Mains Fuse(s) failed.
Check all mains fuses. Replace after
correcting fault. Check for loose wire.
Unit not operating -
Power On.
Fault Alarm
Check volt free contacts, investigate and
clear fault.
Fire detection or external interlock fault
no feed on wire.
Investigate and correct.
Control MCB tripped.
Re-set after investigating and correcting
fault.
Loose wire in control circuit Investigate and tighten connector.
Motor/Fan Assembly jammed.
Isolate unit and check free rotation of motor/
fan assembly. If faulty - replace.
Fan internal protection tripped.
Investigate internal protection, which is self-
resetting. Check fan for correct operation.
Replace if faulty.
Faulty motor windings/capacitor.
Motor humming would indicate fault in motor
or capacitor.
Safety device or internal relay switch
open circuit.
Check through circuitry starting at control
MCB - action faults. Check primary and
secondary voltage.
Anti cycling timer.
Wait until timer times out and try again.
Limited to 10 starts/hour.
Unit operating -
No Cooling/Heating
Overheat cut-out operation (optional)
If auto reset has tripped – heaters will reset
automatically – Check fan and lters for
sufcient airow.
If manual reset has tripped – heaters can
only be reset manually - Check fan and
lters for sufcient airow.
Loose connection in control circuit. Check and tighten connections.
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