You realize that this code is not optimal? Much better would be such as :
Qt Code: 
  1. #include "mainwindow.h"
  2. #include "ui_mainwindow.h"
  3.  
  4. MainWindow::MainWindow(QWidget *parent) :
  5.     QMainWindow(parent),
  6.     ui(new Ui::MainWindow)
  7. {
  8.     ui->setupUi(this);
  9. }
  10.  
  11. MainWindow::~MainWindow()
  12. {
  13.     delete ui;
  14. }
  15.  
  16. void MainWindow::pumpLabelOnOff(QLabel *pl)
  17. {
  18.     if( pl->text() == "Pump On")
  19.         pl->setText("Pump Off");
  20.     else {
  21.         pl->setText("Pump On");
  22.     }
  23. }
  24.  
  25. void MainWindow::on_Pump1_clicked()
  26. {
  27.     pumpLabelOnOff(ui->Pump1Label);
  28. }
  29.  
  30. void MainWindow::on_Pump2_clicked()
  31. {
  32.     pumpLabelOnOff(ui->Pump2Label);
  33. }
  34.  
  35. void MainWindow::on_Pump3_clicked()
  36. {
  37.     pumpLabelOnOff(ui->Pump3Label);
  38. }
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