Autopilot APCEM2 Troubleshooting Manual - Page 2

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Troubleshooting Digital Autopilot Controllers

Digital Controllers: APCETHD, APCECOTH, APCECOD, APCTMDT

1) Check Screen: Plug controller into outlet, flip breaker switch at bottom of controller to ON position.

LED screen should light up, starting with an "8" moving across the screen.

This will allow you to make sure there aren't any dead spots.

Here is an example of a dead spot:

2) Testing buttons: Hold "↑" button until KEY_ 0 is displayed. Begin pressing each button in sequence,

they should display the corresponding numbers below (screen will display "KEY_1", "KEY_2", etc.). If a

button isn't working, it won't display its number. Don't forget the arrow buttons are numbered too.

Note the APCECOD is missing some of these buttons, but the numbers will still follow the diagram

below.

3) Check photocell by covering up the photocell on the sensor with your hand or thumb (make sure to

fully cover it). After 30 seconds or so, the small LED next to "DAYTIME MODE" should turn OFF.

Flashing "Status" light on CO2 sensor means normal operation.

This should say "50.5 rH", but there is a

dead spot in the 0 digit. This dead spot

would make the "8" during startup look like

a "6" or a "G".

Photocell on sensor