can a bank seal the flat for non-payment of loan

The bank may auction the property as per procedure.

If the loan was granted on the collateral strength of the immovable property, then the bank can very well proceed with the recovery suit by attaching the property and sell it thorugh auction to adjust the outstranding amount

Many thanks sir for your valuable legal advice

Best regards 

I have 2 home loans, I am paying EMI of one and not of the other, will the bank seal both my flats, both are from the same bank, one is going proper but the other one has become NPA