OMEGA AIR RDP 20-1900

Questions and Answers

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luis30Aug 17, 2025
What to do if my OMEGA AIR RDP 20-1900 Dehumidifier does not start?
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  Kevin ManningAug 17, 2025
  If your OMEGA AIR Dehumidifier doesn't start, begin by inspecting the electrical installation, both internally and externally. Then, determine if the controller is malfunctioning by checking for output voltage on the controller pins after the start-up time. Also, verify that no safety switches (high and low pressure) are active, especially if this is the first start after installation. For 3-phase powered dryers, ensure the phase sequence is correct. Finally, check for potential coolant leakage by examining the dryer's pressure on service valves.
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Justin VanceAug 20, 2025
Why is the dew point temperature high on my OMEGA AIR RDP 20-1900 Dehumidifier?
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  banksjohnAug 20, 2025
  If the controller of your OMEGA AIR Dehumidifier shows a high dew point temperature (e.g., >5°C), verify that the sensor is correctly installed within the insulated tubing on the evaporator inlet; adjust its placement if necessary. Also, the bypass valve might not be set properly; unscrew the protection cap and tighten the nub clockwise for one full turn (360°), and wait to see if the dew point values lower, repeating the process if needed. Check the dryer pressure on service valves for potential coolant leakage in the system. High ambient temperature can also cause this issue.
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Michael WareAug 22, 2025
What does error 'Cln' mean on OMEGA AIR Dehumidifier?
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  Katherine ParkerAug 22, 2025
  If the “Cln” error appears on your OMEGA AIR Dehumidifier's controller, it means the temperature on the condenser has exceeded 70°C. This may happen if the ambient temperature is too high, or the condenser coil is dirty, so please clean the condenser coil. Another reason may be that the fan is not working, so check the electrical wiring of the fan. Also, check the connection of the condenser temperature sensor to the controller to ensure it's properly connected.
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Nicholas Miller DDSAug 25, 2025
How to fix the condenser fan on my OMEGA AIR Dehumidifier if it's not working?
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  Christopher JamesAug 26, 2025
  If the fan on the condenser of your OMEGA AIR Dehumidifier isn't working, check the fan's electrical wiring. Also, check the output voltage for the fan on the controller. If these steps don't resolve the issue, test the fan by connecting it to an external power supply to see if the fan itself is functional.
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philipharrisAug 27, 2025
What does error 'Lt' mean on OMEGA AIR Dehumidifier?
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  Colin HaleAug 27, 2025
  The “Lt” error on your OMEGA AIR Dehumidifier's controller indicates that the dew point temperature value has dropped below -2°C. The bypass valve may not be set properly; unscrew the protection cap and tighten the nub counter-clockwise for one full turn (360°), and wait to see if dew point values are rising, if not repeat process. This error may also occur if the ambient temperature is too low.
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cynthia24Aug 29, 2025
What to do if my OMEGA AIR RDP 20-1900 drain is in alarm or not working?
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  Ethan RamirezAug 30, 2025
  If the drain of your OMEGA AIR Dehumidifier is in a state of alarm or not working, the capacitive sensor may be dirty. To resolve this, open the condensate separator and clean the plastic tube of the sensor. Additionally, check if the service valve in front of the drain is closed and open it if necessary. Ensure the dryer is pressurized by setting normal operating conditions. If these steps don't work, the solenoid valve may be defective, requiring replacement of the condensate separator.
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Doris RiceSep 1, 2025
What do errors 'Pf1', 'Pf2', 'Pf3' mean on OMEGA AIR Dehumidifier?
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  James ConleySep 1, 2025
  If errors “Pf1”, “Pf2”, or “Pf3” are displayed on the controller of your OMEGA AIR Dehumidifier, it indicates that a sensor is either missing or improperly installed. Check the sensor wiring on the controller to ensure it is correctly connected. The controller itself may also be faulty and need replacement.
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christine59Sep 4, 2025
What does error 'Ht' mean on OMEGA AIR RDP 20-1900?
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  Edward HooverSep 4, 2025
  If the error “Ht” appears on the controller of your OMEGA AIR Dehumidifier, it signifies that the compressor temperature has surpassed 110°C. Check the copper tubing for any leakage, as this could cause the temperature to rise above 110°C due to insufficient coolant in the system.
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Shelby MelendezSep 6, 2025
What to do if condensate isn't draining when I press the TEST button on my OMEGA AIR RDP 20-1900 Dehumidifier?
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  Matthew WallaceSep 6, 2025
  If you press the TEST button on your OMEGA AIR Dehumidifier and the condensate doesn't drain, first check if the service valve in front of the drain is closed; if so, open it. If that's not the issue, ensure the dryer is pressurized by setting normal operating conditions. If the problem persists, the solenoid valve may be defective, requiring you to replace the condensate separator. Another potential cause is a damaged circuit board, in which case you should replace the condensate drain.
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Ryan TaylorSep 9, 2025
Why is my OMEGA AIR Dehumidifier spout blowing out air?
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  Bethany VasquezSep 9, 2025
  If the spout of your OMEGA AIR Dehumidifier is blowing out air, it could be due to a dirty electromagnetic valve diaphragm. Open the drain and clean it. Alternatively, the capacitive sensor may be dirty; in this case, open the condensate separator and clean the plastic tube of the sensor.

OMEGA AIR RDP 20-1900 Specifications

General

Brand	OMEGA AIR
Model	RDP 20-1900
Category	Dehumidifier
Language	English

Summary

Troubleshooting Dryer Issues

Common Dryer Symptoms and Solutions

Details common dryer symptoms like no lights, drainage issues, and error codes with their causes and actions.

Controller RDC 2 Functionality

Sensors, Components, and Operation Modes

Explains controller sensors, regulated components, and normal/alarm operation modes.

Electric Scheme and Wiring

Describes the controller's electrical connections, outputs for components, and alarm signals.

Parameter List and Settings

Lists all configurable parameters for the RDC 2 controller and procedures for changing them.

MODBUS Communication

Details the MODBUS communication protocol, addresses, and variable mapping for the controller.

Hot Gas Bypass Valve Operation

Valve Function and Adjustment

Explains the hot gas bypass valve's role in maintaining evaporator temperature and its adjustment procedure.

Spare Parts

Component Identification and Model Numbers

Lists available spare parts, their descriptions, part numbers, and applicability to different dryer models.

OMEGA AIR RDP 20-1900 - User Manual

Table of Contents