If you do a CPF Topup to OA, will it reduce the accrued interest without selling the house ?, Is it a good idea to repay your house loan earlier at the cost of wiping out CPF savings ?

I don't think it's a good idea to repay your house loan earlier by topping up your OA and wiping out CPF savings, it will only result in more “accrued interest’. Recommended to do partial repayment in cash rather than in cpf..