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Aprilaire Dehumidifier Troubleshooting Manual
Models 1830, 1850, 1870
Table of Contents
Troubleshooting Diagnostic Codes .............................................................................................................. 2
E1 ..................................................................................................................................................... 2
E2, E3 ................................................................................................................................................ 3
E4……………………………………………………………………………………………………………………………………………….4
E5, E6 ................................................................................................................................................ 7
E7, E8 ................................................................................................................................................ 8
E9……………………………………………………………………………………………………………………………………………….9
Verifying Capacity....................................................................................................................................... 10
Water Leaks ................................................................................................................................................ 15
Fan Does Not Function ............................................................................................................................... 15
Circuit Breaker Trips ................................................................................................................................... 16
Defrost, E8, Noise……………………………………………………………………………………………………………………………..17
Parts Lists .................................................................................................................................................... 18
Electrical Schematics .................................................................................................................................. 22
Instruments you will need to complete troubleshooting:
1. Digital Multi-Meter (DMM) capability of measuring
• AC and DC voltage
• Resistance
• Capacitance
Minimum tools needed to complete troubleshooting:
1. Torx T20 and T25 screwdrivers or driver bits
2. Small (terminal) flat head screwdriver
3. Needle nose pliers
4. Level (to troubleshoot water leak claims)
WARNING: 120-volts can cause serious injury or death. Do not touch live, exposed 120-volt
wiring or wiring terminals.
Troubleshooting must be performed by a qualified HVAC service person trained to take the
proper safety precautions when performing service on 120-volt equipment.
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