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Aprilaire Dehumidifier Troubleshooting Manual
Models 1710A, 1750A, 1770A
Table of Contents
Troubleshooting Fault Codes ....................................................................................................................... 1
1 blink ............................................................................................................................................... 2
2 blinks ............................................................................................................................................. 2
3 blinks ............................................................................................................................................. 2
4 blinks ............................................................................................................................................. 2
5 blinks ............................................................................................................................................. 6
6 blinks ............................................................................................................................................. 6
7 blinks ............................................................................................................................................. 6
Verifying Capacity......................................................................................................................................... 8
Water Leaks ................................................................................................................................................ 11
Fan Does Not Function ............................................................................................................................... 12
Circuit Breaker Trips ................................................................................................................................... 13
1710A/1750A/1770A Parts List .................................................................................................................. 14
1710A/1750A Electrical Schematic ............................................................................................................ 16
1770A Electrical Schematic ........................................................................................................................ 17
Instruments you will need to complete troubleshooting:
1. Digital Multi-Meter (DMM) capability of measuring
AC and DC voltage
Resistance
Capacitance
2. Temperature Meter for air temperature
3. Humidity Meter for air RH
Minimum tools needed to complete troubleshooting:
1. Phillips screwdriver (#2) or drill driver with #2 Phillips bit
2. Small (terminal) flat head screwdriver
3. Needle nose pliers
4. Level (to troubleshoot water leak claims)
Note: Do not hook up refrigeration gauges to the dehumidifier. Use of gauges will result in
refrigerant loss and performance loss.
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