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This is an indication that you have a problem on the power supply section or on the load because of the
following reasons : 1. Over
Voltage - the regulator might
be cycling on over voltage due to lack of load. 2. Over Current Protection - excessive load or faulty power
supply cycling will trigger the over current protection circuit. This is
because of open fusible resistor in line with a shorted Voltage regulator IC.
3. Leaky Capacitor - a dried up main filter capacitor or
other filter capacitor in the power supply that is producing an
out-of-regulation condition. A bad filter capacitor on the output of a series
regulator may result in excessive/drop of voltage. 4. A problem with the microcontroller, relay or its
driver, or standby power
This is not DIY and quite technical, I've advice you to look for a
qualified technician or send it to repair shop to isolate the problem.
But first check if your unit is under warranty then avail it
because the manufacturer of your unit will fix it for free or with a little
Hope it may help you.
Have a nice day!
Thanks for using Fixya.
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