Dispatched for system not reach desired temperature. upon arrival system was operating. well diagnose in the system. The second stage heating delay was turned off this prevented the system going into second stage. I adjusted the dip switches for a 10 minute delay then it will go into second stage. The system was intermittent working this was caused by the secondary drain pressure switch. The drain was airlock, which was created in a blockage. I then cleared all the hoses for the drain and primed the trap. The system has now went into second stage and is operating as it should thank you for choosing LBA services heating, cooling and plumbing.