Aprilaire 1750A Troubleshooting Manual

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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.

Aprilaire 1750A Specifications

General

Model	1750A
Dehumidification Capacity	70 pints per day
Energy Star Rated	Yes
Voltage	115V
Hertz	60 Hz
Drainage Type	Gravity or pump
Amps	5.5
Drainage	Gravity or pump