Aprilaire Troubleshooting and LED Codes for Dehumidifier Models 1750 and 1770

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TROUBLESHOOTING

Technical Support is available Monday through Friday, 7:00 a..m.. to 5:00 p..m.. CST, at (800) 334-6011.. Use the guides on the following pages to help find and correct system faults.. Contact Technical Support before replacing the unit or components or for additional troubleshooting..

LED CODES

The dehumidifier control board uses the Status LED to communicate current status or a fault code.. Faults can be either critical or non- critical.. When a critical fault is detected, the red LED will flash the fault code and all outputs will immediately turn off.. A critical fault can be cleared by repairing the fault and cycling power or turning the control knob to OFF.. When a non-critical fault is detected, the red LED will flash the fault code and the dehumidifier will revert to limited operation.. A non-critical fault will be cleared when the fault is repaired.. Cycling power is not required to revert back to full operation..

TABLE 7 – Green LED Codes

Activity

Status

 

 

Solid ON

Compressor ON

 

 

Blinking 1 sec.. ON & 1 sec.. OFF

Sampling

 

 

Blinking 1/2 sec.. ON & 1/2 sec.. OFF

Defrosting

 

 

Alternating Green & Red

Test Mode

 

 

TABLE 8 – Red LED Codes

Number

of Blinks

Fault Type

Failure Mode

Failure Condition

Action

1

Critical

Internal RH

RH sensor non-existant, erratic or reads out

1.. Check connection between sensor board and control board..

 

 

sensor fault..

of 0% –100% range..

2.. If connection okay, call Technical Support..

 

 

 

 

 

2

Critical

Internal

Temperature sensor non-existent, erratic or

1.. Check connection between sensor board and control board..

 

 

temperature

reads out of -20°F –150°F range..

2.. If connection okay, call Technical Support..

 

 

sensor fault..

 

 

 

 

 

 

 

3

Critical

Model 70

Model 70 not communicating with

1.. Check connections between Model 70 and control board..

 

 

communication

dehumidifier control board..

2.. If connections okay, turn off the dehumidifier and remove

 

 

error..

 

the Model 70.. Use a short section of 4-wire cable to

 

 

 

 

reconnect the Model 70 to the control board.. Turn the

 

 

 

 

dehumidifier back on and increase the dryness setting on

 

 

 

 

the Model 70.. If the dehumidifier turns on, the problem is

 

 

 

 

with the wiring installed between the dehumidifier and the

 

 

 

 

Model 70..

 

 

 

 

3.. If the above does not fix the problem, call Technical

 

 

 

 

Support..

 

 

 

 

 

4

Critical

Insufficient

After 120 minutes of compressor operation,

1.. Check the frost sensor connection at the control board..

 

 

capacity..

the frost sensor temperature is not at least

2.. Remove the side panel (when facing side of unit, on/off

 

 

 

10°F below the inlet air temperature..

switch will be on left) and verify the temperature sensor is

 

 

 

 

not damaged, is fully inserted in the sensor well, and the

 

 

 

 

well is filled with thermal paste..

 

 

 

 

3.. If the sensor is not damaged and positioned correctly,

 

 

 

 

contact Technical Support..

 

 

 

 

 

5

Non-Critical

Inlet air

Internal temperature sensor reads out

1.. Circulate air through the unit by setting the Cycle Period to

 

 

temperature out

of 50°F –105°F range for compressor

1 hour and Cycle Time to 60 minutes.. After a minimum of

 

 

of range..

operation.. NOTE: If compressor is on when

10 minutes, cycle power to the dehumidifier..

 

 

 

fault condition occurs, the compressor will

2.. If fault persists, call Technical Support..

 

 

 

turn off.. If the compressor is not on when

 

 

 

 

the fault condition occurs, there is no fault..

 

 

 

 

 

 

6

Critical

Frost sensor

Frost temperature sensor nonexistent,

1.. Check the frost sensor connection at the control board..

 

 

failure..

erratic or reads out of -20°F –150°F range..

2.. Remove the side panel (when facing side of unit, on/off

 

 

 

 

switch will be on left) and verify the temperature sensor is

 

 

 

 

not damaged, is fully inserted in the sensor well, and the

 

 

 

 

well is filled with thermal paste..

 

 

 

 

3.. If the fault persists, contact Technical Support..

 

 

 

 

 

7

Non-Critical

Float switch

Open circuit between float switch inputs..

1.. Empty the condensate pan..

 

 

open..

 

2.. Check the float switch connection at the control board..

 

 

 

 

3.. If not using float switch, verify jumper is between float

 

 

 

 

switch terminals on dehumidifier control board..

 

 

 

 

4.. If the problem persists, replace the float switch..

 

 

 

 

 

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Contents Table of Contents Safety InstructionsWhole-Home, see Spot, see Convertible, see OverviewUnpacking and Contents SpecificationsLocation Notes Install Unit Indoors Do not expose to elementsPower Outlet within 8 ft.. of unit Location ConsiderationsDesign Airflows Mechanical InstallationDuct Collars & Backflow Damper Ductwork RecommendationsWhole-Home installation Mechanical InstallationDrain Attic Ducting & Wiring Basement Ducting & WiringAttic Installation Note Duct Work Grilles with 8 duct collars Spot installationDIP Switch Configuration Sequence of OperationWiring Notes Ducting & WiringCondensate Pan & Normally Closed Float Switch Convertible installationOptional Component OFF Test Ventilation oR Air Cycling CFM Delivered Determine Fresh AIR Delivery RateDetermine Cycle Time Outdoor Temperature Sensor Installation Switch NotesVent-Timed, Dehumidifier Initiates Ventilation Vent-Timed, Hvac Initiates VentilationVent-Auto Whole-Home Wiring & DIP Switch ConfigurationModel 70 living space control LocalExternal Third-party controlVentilation Adjusting Dehumidifier SET PointSystem Checkout DehumidificationRed LED Codes TroubleshootingLED Codes Green LED CodesTroubleshooting Guide Troubleshooting
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1770A, 1750A specifications

The Aprilaire 1750A and 1770A are advanced dehumidifiers designed to enhance indoor air quality by effectively managing humidity levels in residential settings. These models stand out for their efficiency and durability, making them popular choices for homeowners seeking to create a comfortable living environment.

One of the main features of the Aprilaire 1750A is its ability to remove up to 70 pints of moisture per day, while the slightly larger 1770A can handle up to 90 pints. This powerful moisture removal capacity makes both models particularly suitable for larger homes or spaces prone to high humidity, such as basements and attics.

In terms of technology, both units utilize a robust and energy-efficient compressor system that operates quietly, ensuring minimal disruption during their operation. The dehumidifiers are designed with an innovative control system that allows for humidity settings to be easily adjusted, providing users with full control over their indoor environment. This intelligence enables the units to efficiently operate only when necessary, resulting in significant energy savings.

The Aprilaire 1750A and 1770A feature an automatic drain option, allowing for continuous operation without the need for frequent manual emptying of the water reservoir. This functionality is particularly beneficial in high-humidity areas where regular monitoring may be cumbersome. Homeowners can also appreciate the unit’s easy-to-clean filter, which helps maintain efficient performance and prolongs the life of the dehumidifier.

Both models come equipped with an integrated humidity sensor, which actively monitors the humidity levels in the home. This allows the units to adjust their operation automatically based on the current conditions, optimizing moisture removal while maintaining energy efficiency. The sleek and compact design of the Aprilaire models ensures they can fit unobtrusively into most spaces, while durable construction materials guarantee long-lasting performance.

Moreover, the Aprilaire 1750A and 1770A models are backed by a comprehensive warranty, offering peace of mind to homeowners investing in their comfort and health. Overall, these dehumidifiers are excellent choices for anyone looking to improve air quality and create a healthier, more comfortable indoor atmosphere. Through their advanced features, reliable performance, and user-friendly design, the Aprilaire 1750A and 1770A stand out as leaders in the dehumidification market.