FR304 gets short circuit

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xyz9915

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Hello,
I found this circuit on internet and this circuit is working satisfactorily. But since I need 155VDC so, I increased number of turns to 35 turns. I also replaced MUR1560 with FR304 due to non availability of MUR1560.
FR304 is fast recovery diode with Peak Repetitive Reverse Voltage=400V
Average Rectified Output Current=3 Amp

The problem is that these diodes (FR304) gets short circuit even the load is only 10w. I changed faulty diodes many times with new one but problem still not fixed. So please help me what is happening with these diodes.
 

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