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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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E2 – High Refrigeration Pressure: The temperature of the discharge line exceeds 190°F. This is self-

correcting unless it occurs for five consecutive compressor starts. This is usually caused by

the inlet air temperature being too high (i.e. greater than 100°F), or very low airflow through

the dehumidifier.

1. Turn the ON/OFF toggle switch OFF to reset the diagnostic code.

2. If the fan is not working, see “Fan does not Function” section on page 15.

3. Consider the following for the application:

1. If ducting to the HVAC system, make sure the inlet to the dehumidifier is not ducted

to the supply side of the HVAC system.

2. Attic installations – Inspect the ductwork attached to the inlet of the dehumidifier for

leaks if the ambient temperature is high.

3. Ventilation applications – High temperatures may be offset by mixing air from the

home into the dehumidifier.

E3 – Model 76 Remote Control Communication Loss: A Model 76 control, wired to the Remote

terminals of the User Interface Assembly, had communication, but has now stopped

communicating.

Note: For E3 to be displayed, the method of control had to have been set up for a Remote

control. This is done by selecting Remote Enabled in the set-up menu.

1. Use the color of the wire connected to the A, B, + and – (on the Model 76, the “+” and “-“

terminals are labeled “R/+” and “C/-“) terminals on both the base of the Model 76 and

the dehumidifier User Interface Assembly to verify that they are wired correctly. Make

sure the terminal screws on both the User Interface Assembly and the Model 76 base are

tight.

2. Remove the Remote terminal block from the User Interface Assembly and measure the

DC voltage across the + and – pins on the User Interface Assembly – this should read

approximately 35 V DC (±3V for voltage variation and load). If there is 0 volts, the User

Interface Assembly (5445) must be replaced. If in range, reinstall the Remote terminal

block.

3. If connections are correct and secure, turn off the dehumidifier and remove the Model

76 control. Use a short section of 4-wire cable to reconnect the Model 76 to the User

Interface Assembly to see if there is a problem with the existing wire. Turn the

dehumidifier back on. If the “E3” code continues, the Model 76 must be replaced, if the

code is gone, then the wire between the Model 76 and the dehumidifier must be

replaced.

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