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SERVICE SECTION
CHAPTER 3 - TROUBLESHOOTING
Problem
Possible
causes
Corrective Action
In electrical box, measure AC voltage between LIVE and NEUTRAL terminal
block. The voltage should be around either 230Vac or /- 10%. If the
voltage is much lower or near zero, check cable connection at connector A.
Fan is Switched Off Please switch on the FAN by pressing the FAN switch at the front panel.
Faulty switch
Check the fan switch. Ensure switch condition is good at ON and OFF position.
Faulty speed control
Switch off the cabinet. Short speed control connection by connecting a jumper
wire across the 2 cables going to speed control.
Switch on the cabinet. If the fan operates properly, you can conclude that the
speed control is defective.
If the fan does not operate, the problem is not with the speed control.
No airflow, burning
smell and possibly a
humming noise too
Faulty capacitor
Capacitor is located on electrical panel. Switch off main power, disconnect two
cables of capacitor, use a multimeter, turn selector to capacitance position, record
the value between two capacitor cables. The value should match to the one
printed on capacitor body with +/-10% tolerance (for example 10uF+/-10%). If the
value is out of given ranges, replace it.
Auto-thermal cut-off
Overheated Blower. Wait for 60 minutes and try again. Ensure there is no
hazardous materials inside the cabinet. If all above possibilities are OK and the
blower still can not run after 60 minutes, check next step.
Motor is silent
Motor failure
Try to connect power directly to motor including its capacitor. If the motor still can
not run, it may be spoiled. Check for any physical damage/faulty. Replace blower
if it is indeed faulty.
Low building supply
voltage
Using multimeter, measure AC voltage at the motor voltage sampling port as
described in the re-certification section of this manual. This is to measure the
blower’s supply voltage.
If the supply voltage is lower than the Nominal Voltage value recorded in test
report, adjust the speed control to get blower’s output voltage as specified in the
Test Report – Test Conditions Documentation Sheet.
Airflow is not
at nominal
velocity
Fluctuating Voltage
If the building supply voltage fluctuates more than the stated tolerance (+/- 2%),
connect the cabinet to a voltage stabilizer.
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Summary of Contents for ASCENT OPTI BASIC
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