Aprilaire E100 - Page 21

TABLE 1: DIAGNOSTIC CODES
Diagnostic
Code Failure Mode Action Reset
E6
Low Temperature
Thermistor Failure
1. Check the low temperature sensor connection at the power board.
2. Remove the side access panel and verify the sensor is not damaged and
connected to the suction line.
3. If the sensor is connected and secured to the refrigeration line, it may
need to be replaced with Part #5455 – contact Technical Support to
conrm.
Cycle Power
E7 Float Switch Open
1. Empty the condensate pan.
2. Check the oat switch connection at the user interface.
3. If not using a oat switch, verify jumper is between oat switch terminals
on dehumidier user interface.
4. If the problem persists, replace the oat switch.
Self-Correcting
E8
Inlet Air Temperature
Out of 50°F–104°F Range,
or Dew Point Below 40°F
1. Verify all ductwork is properly sealed.
2. Check for air leakage that might affect the temperature or RH of the
incoming air.
3. If the air temperature is in range and the dew point is above 40°F, contact
Technical Support.
Self-Correcting
E9
Outdoor Temperature
Sensor Open or Shorted
1. Check the sensor connection at
the power board.
2. Remove the wires from the
terminals and measure the
resistance. A short circuit will have
a resistance very close to 0 Ohms
and an open circuit will have a
very high resistance. Use the Ohms
chart at right to approximate
the resistance based on outdoor
temperature.
3. If the sensor is not reading
correctly, replace the sensor,
Part #8052.
Outdoor
Temperature Resistance
0°F 84,500 Ohms
20°F 46,000 Ohms
40°F 26,000 Ohms
60°F 15,500 Ohms
80°F 9,500 Ohms
100°F 6,000 Ohms
Self-Correcting
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