1. Change stainless steel temperature controller pocket
2. Heating Element for Calorifier tank
3. Purge and Vacuum of Refrigerant Circuit
4. Charge-in suitable Refrigerant 
5. Change of faulty thermostat
6. Inspect & Clean Y-Strainer
7. Inspect Electrical Operating Sequence
8. Check compressor, seals, pipelines for leakage
9. Inspect and Repair Loose connection wire
10. Cleaning of evaporator coil
11. Flushing of heat exchanger
12. Replace of pressure switch and faulty gauges
13. Check for heat pump faulty such as high or low pressure trip