Hi and welcome to FixYa. I am Kelly. First off I am not in this for the money. My only goal is to help you resolve your problem. Check your line sensing coil lead connections. The transfer switch sensing coil and transfer relay are the 2 main causes of this failure. However.. the control panel control board can also cause this problem. Make sure you inspect the control board for any signs of corrosion and a swollen capacitor. The top of the capacitor should be flat. If it is raised at all then the cap is failing. Make sure you have the full 12VDC across teminals 23 and 194 of the control panel terminal board during any power transfers. If the voltage drops below 10VDC the coil may not transfer power. If you do note a voltage of less than 12VDC start checking for frayed wire conductors at connection points / terminals and any signs of corrosion. Lastly if you have an indoor type transfer switch and it is mounted outside... the transfer swtich assy may be starting to fail.
Answers & Comments
Hi and welcome to FixYa. I am Kelly. First off I am not in this for the money. My only goal is to help you resolve your problem. Check your line sensing coil lead connections. The transfer switch sensing coil and transfer relay are the 2 main causes of this failure. However.. the control panel control board can also cause this problem. Make sure you inspect the control board for any signs of corrosion and a swollen capacitor. The top of the capacitor should be flat. If it is raised at all then the cap is failing. Make sure you have the full 12VDC across teminals 23 and 194 of the control panel terminal board during any power transfers. If the voltage drops below 10VDC the coil may not transfer power. If you do note a voltage of less than 12VDC start checking for frayed wire conductors at connection points / terminals and any signs of corrosion.
Lastly if you have an indoor type transfer switch and it is mounted outside... the transfer swtich assy may be starting to fail.
Thanks for choosing FixYa,
Kelly