Yellow ALERT LED 9 flashes — Low voltage control circuit

What does ALERT LED 9 flashes Yellow mean?

The control circuit voltage is below 18VAC, which is insufficient for proper operation of the module and system controls.

• Control circuit transformer is overloaded.
• Low incoming line voltage to the unit.

Click steps to track your progress.

1. 1

   Turn off unit power supply and install a lockout tag.

2. 2

   Check the control circuit transformer for proper voltage output (should be 24VAC nominal).

3. 3

   Investigate if the control transformer is overloaded.

4. 4

   Measure the incoming line voltage to the unit.