Make sure DC volts are within operation range and 115 volts are supplied to the AC power module board.įor rooftop air conditioners, follow these instructions to troubleshoot: Verify configuration operation before troubleshooting the AC power module. The board is a signal receiver and completes AC volt circuits according to what signal it receives. The 3-amp fuse is the only replaceable component. Replace power module board on units that are not equipped with a replaceable control box. If any of these are defective, the complete control box must be replaced. The AC power module consists of relays, dip switches, plug receptacles, and other components. If the previous checks are not correct, the relay is defective and should be replaced.If the above checks are correct, the relay is good.There should be continuity between terminals COM and NO. Energize the coil with DC volts (10 to 16).There should be no continuity between terminals COM to NO. Next, verify the relay coil is not energized (no DC power).First verify AC volts have been turned off to the unit.On models 39115.602, 39115.616, and 39115.626, the relay is used to complete 115 volt AC circuits to the compressor and for fan speeds. When energized (power to terminals 1 and 3), there will be continuity between terminals 4 to 2. When the coil is not energized (no power to terminals 1 and 3), there is no continuity between terminals 4 to 2. On model 39424.601, it is used to complete 115 volt AC to the reversing valves for circuit 1 and circuit 2. On model 39224.601, the relay is used to complete the 115 volt AC circuit to the compressors, high fan, and low fan. 30 seconds later after terminal 1 receives AC volts, move voltmeter lead to terminal 2 of relay.Place one lead of the voltmeter to terminal 1 of relay. Its purpose is to provide a 30-second delay of power to circuit 2 system after circuit 1 system. The time delay relay is used on Model 39424.601. Relaysĭepending on your model, the relays on these units may be used for different purposes. Verify all wires are tight in each connector and to all components. On some basement units, there are two 9-pin connectors. Verify that all wires are tight in this connector and to all components.Ĭheck this too: Why Does My RV Air Conditioner Leak When it Rains? On rooftop units, there is a 6-pin connector. If the unit’s compressor or fans fails to operate, chances are it is not receiving proper power. Check the installation and operating manual that comes packaged with each heat pump system. Be sure you are familiar with the proper operating instructions for the specific model of heat pump you are diagnosing. Operating instructions can vary from one model to another. In an attempt to troubleshoot and fix the problem, check the following: Operation If the fan operates but the compressor doesn’t come on and does not hum, this can be caused by several issues. Dometic RV Air Conditioner Compressor Not Coming On This error code indicates defrosting in progress. To fix this error, you need to call for service. The following is a list of error codes that you may get and what they actually mean: Some of the fault codes will display only after the unit is stopped, which is normal and is done where the fault will not interrupt the normal function of the air conditioner. Dometic RV Air Conditioner Error Codes, Their Meaning, and Fixesĭometic RV air conditioners display various error codes to indicate issues with the unit. Another probable cause for this problem is frayed wiring or your thermostat is not correctly calibrated. A bad thermostat can prevent the signal to the cooling system. If your RV air conditioner keeps turning on and off, the thermostat may be the problem. Why Does My Dometic RV Air Conditioner Keep Shutting Off? Retest system ensuring that all functions are present and operational.At this time the light should extinguish, and the mode should register “OFF”.Release the two buttons previously held down.
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