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Troubleshooting Analog Temp Controller APCET

1. Plug controller into 120V, 60Hz power outlet. Unit should be vertical, without a heating source nearby.

2. Test photocell by covering up the PHOTOCELL with your hand or thumb (make sure to fully cover it).

After 20 seconds or so, the small LED next to "DAYTIME MODE" should turn OFF.

If DAYTIME MODE doesn't come on 30 seconds after startup, make sure it is getting plenty of light.

3. Testing Relay

While DAYTIME light is on (photocell is receiving light), and in COOL mode, turn SET DAY knob fully

counterclockwise. The OUTPUT ON light should turn on, confirm the outlet has power (plug in small

device, fan etc). Then turn SET DAY knob fully clockwise and relay should shut off power to the outlet.

4. Testing Temp Sensor

While DAYTIME light is on (photocell is receiving light), and in COOL mode, turn SET DAY knob fully

counterclockwise (same as above). The OUTPUT ON light will turn on. Slowly turn the knob clockwise

until the OUTPUT ON light turns off. Then, turn it slowly counterclockwise until OUTPUT ON light turns

on again. This temperature is the current room temperature.

NOTE: Current room temperature can be off by several degrees when comparing to another

thermometer. For increased accuracy use Digital Environmental Controller.

COOL or HEAT mode

Turn knobs, wait for 5 sec, lights will blink. Then return knob to desired set point.

COOL:

HEAT:

Error Codes:

Abnormal Temperature:

Max. Amperage Exceeded:

Red LED blinks twice every second

Red and Yellow LED blink alternately