Servicing or Repairing of blockage and choke in the boiler, Providing and replacement of glycol motor seal, Servicing, or Repairing of the fan coil unit and Radiator, Running and, comprehensive repairing and making good of leakage, Providing and replacement of fuel pump, Supplying glycol, unit existing central heating system, Providing and, replacement of existing fuel pipes, replacement of fuel filters, Providing and replacement of, fuel filters assembly, Providing and replacement of burner, nozzles, Providing and replacement of oil pump sensor, Providing and replacement of photo cell with wire, Providing, and replacement of burner connector, replacement of air flow sensor, Providing and replacement, of glycol pump starter, temperature metre