The plumber agreed to install central heating, costing SR560. Performance partially defective. The householder discovered the defect, and the plumber refused to fix it. The repair was valued at SR174. So, the defendant refused to pay any of the SR560 of the contract. Householder - defective central heating worth SR560 - SR174 = SR386.

1.Was the contract breached? Explain?

2.Was the plumber entitled to payment? Or is the householder able to get away without paying?