Issues with your RV air conditioner can be frustrating. If the unit is not performing as it should, this can make it uncomfortable for the RV occupants, especially during extreme conditions. The thought of “breaking the bank” to have the problem is another “headache”. Show
The good news, however, is that many of the issues to do with your RV air conditioner can be resolved by yourself, once you know the right steps required to successfully troubleshoot the unit. In this guide, we are going to show you what you need to do to resolve some common Dometic RV air conditioner issues. Performing a reset on your comfort control center system removes all previous program memory and resets the system to factory settings. The procedure may be necessary if the comfort control center is not operational, inadequate data, or no functions occur. The factory setting of 72oF for cooling and 68oF for heating modes are entered. To initiate a reset, follow these steps below:
Why Does My Dometic RV Air Conditioner Keep Shutting Off?If your RV air conditioner keeps turning on and off, the thermostat may be the problem. A bad thermostat can prevent the signal to the cooling system. Another probable cause for this problem is frayed wiring or your thermostat is not correctly calibrated. Dometic RV Air Conditioner Error Codes, Their Meaning, and FixesDometic RV air conditioners display various error codes to indicate issues with the unit. 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. The following is a list of error codes that you may get and what they actually mean:
To fix this error, you need to call for service.
To fix this error, you need to call for service.
To fix this error, you need to call for service.
To fix this, call for service.
This error code indicates defrosting in progress. Wait for defrost to complete. Dometic RV Air Conditioner Compressor Not Coming OnIf the fan operates but the compressor doesn’t come on and does not hum, this can be caused by several issues. In an attempt to troubleshoot and fix the problem, check the following: OperationOperating instructions can vary from one model to another. Be sure you are familiar with the proper operating instructions for the specific model of heat pump you are diagnosing. Check the installation and operating manual that comes packaged with each heat pump system. WiringIf the unit’s compressor or fans fails to operate, chances are it is not receiving proper power. Be sure the power cord is plugged in. Also, check the fuses and breakers. On rooftop units, there is a 6-pin connector. Verify that all wires are tight in this connector and to all components. Check this too: Why Does My RV Air Conditioner Leak When it Rains? On some basement units, there are two 9-pin connectors. Verify all wires are tight in each connector and to all components. RelaysDepending on your model, the relays on these units may be used for different purposes. Below are a few examples: The time delay relay is used on Model 39424.601. Its purpose is to provide a 30-second delay of power to circuit 2 system after circuit 1 system. To check the relay:
On model 39224.601, the relay is used to complete the 115 volt AC circuit to the compressors, high fan, and low fan. On model 39424.601, it is used to complete 115 volt AC to the reversing valves for circuit 1 and circuit 2. The relay has a DC volt coil. The coil terminals are 1 and 3. When the coil is not energized (no power to terminals 1 and 3), there is no continuity between terminals 4 to 2. When energized (power to terminals 1 and 3), there will be continuity between terminals 4 to 2. 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. The relay has a DC volt coil. To check the relay:
AC power moduleThe AC power module consists of relays, dip switches, plug receptacles, and other components. If any of these are defective, the complete control box must be replaced. Replace power module board on units that are not equipped with a replaceable control box. The 3-amp fuse is the only replaceable component. The board is a signal receiver and completes AC volt circuits according to what signal it receives. Verify configuration operation before troubleshooting the AC power module. Make sure DC volts are within operation range and 115 volts are supplied to the AC power module board. For rooftop air conditioners, follow these instructions to troubleshoot:
If the circuit is completed and the component is not operating, the problem is the rooftop unit or the connection is not being completed through the connector. Selector switchFor models with mechanical controls, the heat pump has an air distribution box that has a mechanical selector switch and thermostat installed in it. The selector switch has eight positions including “OFF”. This controls fan speed, heating mode, and cooling modes. The thermostat controls the temperature range from 65oF on the coldest side to 90oF on the warmest side. In the cooling/heating mode, the compressor ON/OFF is controlled by the thermostat setting. For cooling operation, the blower runs continuously to circulate air and maintain an even temperature. The compressor will come on when cooling is required to maintain the selected temperature level. Cable assemblyThe ten (10) wire cable is used with remote wall-mounted thermostats. It connects the wall-mounted thermostat (bimetal and electronic thermostat assemblies) to the relay board. To check the cable assembly, disconnect each end of the cable assembly and check for continuity on each wire in the assembly. Also, check each connector for bent pins or loose wires. Each wire has a receptacle that snaps into the connector. ThermostatThere are four types of thermostats used on Duo-Therm units: Mechanical thermostat, Bimetal thermostat, Analog thermostat, and Comfort Control Center. The mechanical thermostat used for air conditioners has two terminals. It controls the on and off cycling of the compressor. To check the thermostat for operation:
There are three different analog thermostats being used to control Duo-Therm air conditioners, air conditioners with heat strips, and heat pumps. The type of thermostat used depends on the unit and the accessories used with it. The proper location of the analog thermostat is very important, to ensure that it will provide a comfortable RV temperature. The Comfort Control Center is the component that makes all decisions for operation depending on the system and the accessories connected to it. If the system is to be used without a remote temperature sensor, the proper location of the Comfort Control Center is very important to ensure that it will provide a comfortable RV temperature. It may be mounted anywhere that is convenient in the coach if the system is to be used with a remote temperature sensor. To check the Comfort Control Center, follow these instructions:
FuseA 3-amp fuse is installed in the analog control box and Comfort Control Center power module to protect the system from shorts or overload created by disconnecting or reconnecting components when DC power is still connected to the system. To test, remove the fuse and do a continuity check. If there is no continuity, the fuse needs to be replaced. Another test can be done without removing the fuse. Use a DC voltmeter to check between the ground and to each side of the fuse, if there is a voltage on one side only, the fuse is bad and needs to be replaced. BreakerThe unit is to be protected by a time-delay fuse or HACR (heating, air conditioner, refrigerator) breaker. If your air conditioner is not coming on, the breaker may have tripped. You can determine if the breaker is tripping prematurely by taking an amp reading at the unit AC voltage supply line. Place a clamp-on type ammeter around the black wire between the unit and the breaker. Turn the unit ON and record the amp draw. If the breaker trips before the rated amperage, replace the breaker. Overload protectorAn overload protector is a component that will open the AC circuit to the compressor if the compressor overheats due to an electrical problem. Some compressors have the overload protector built inside the compressor. This type, if defective, requires a complete compressor replacement. Most compressors have the overload protector mounted on the exterior of the compressor casing. To check this type of protector:
CompressorTo troubleshoot the compressor, follow these steps:
How to Recharge a Dometic RV Air ConditionerTo properly evacuate and recharge a sealed system, you’ll need the following equipment items:
To drain the R-22 refrigerant:
Dometic RV Air Conditioner Not Coming OnIf your unit does not run; no fan, no compressor, it may be due to several reasons. Check the following: OperationOperating instructions can vary from one model to another. Be sure you are familiar with the proper operating instructions for the specific model of air conditioner you are diagnosing. Check the installation and operating manual that comes packaged with each system to make sure you are following proper operating procedures. Check this too: Coleman RV Air Conditioner How to & Troubleshooting Guide AC VoltageThe unit is a 115VAC, 60Hz appliance. The proper operating range is between 103 and 126.5 volts AC. The voltage reading should be taken at the unit power supply leads. Perform one test when the unit is turned OFF and another with it running under load. If the voltage is not within the proper operating range, you must correct it before operating the unit. DC VoltageOn certain electric-controlled air conditioners and heat pump models, DC volts must be supplied to the control board. The operational range is 10 to 16 VDC. If the DC voltage is below 10 VDC, you might experience the improper operation of the components within the mainboard. BreakerThe unit is to be protected by a time-delay fuse or HACR (heating, air conditioner, refrigerator) breaker. If your air conditioner is not coming on, the breaker may have tripped. You can determine if the breaker is tripping prematurely by taking an amp reading at the unit AC voltage supply line:
WiringIf the unit’s compressor or fans fails to operate, chances are it is not receiving proper power. Be sure the power cord is plugged in. Also, check the fuses and breakers. On rooftop units, there is a 6-pin connector. Verify that all wires are tight in this connector and to all components. On some basement units, there are two 9-pin connectors. Verify all wires are tight in each connector and to all components. FuseA 3-amp fuse is installed in the analog control box and Comfort Control Center power module to protect the system from shorts or overload created by disconnecting or reconnecting components when DC power is still connected to the system. To test, remove the fuse and do a continuity check. If there is no continuity, the fuse needs to be replaced. Another test can be done without removing the fuse. Use a DC voltmeter to check between the ground and to each side of the fuse, if there is the voltage on one side only, the fuse is bad and needs to be replaced. Thermostat (Analog, Bimetal, Comfort Control Center)There are four types of thermostats used on Duo-Therm units: Mechanical thermostat, Bimetal thermostat, Analog thermostat, and Comfort Control Center. The mechanical thermostat used for air conditioners has two terminals. It controls the on and off cycling of the compressor. To check the thermostat for operation:
Cable assemblyThe ten (10) wire cable is used with remote wall-mounted thermostats. It connects the wall-mounted thermostat (bimetal and electronic thermostat assemblies) to the relay board. To check the cable assembly:
Ambient temperatureRunning the air conditioner at a temperature below 75oF Fahrenheit may cause the inside coil (evaporator) to freeze up in the cooling mode. This mostly occurs at night. Even after the ambient temperature has gone up, the coils will remain frozen. To assist in the defrosting of the coil, follow these instructions:
Temperatures below 24oF (Comfort Control Center system) or 40oF (mechanical changeover thermostat) will turn off the operation of the heat pump system. It is recommended the auxiliary heat (furnace) be used if the temperatures are subject to dropping below this outdoor temperature. Running the heat pump at an ambient temperature above 70oF will cause the system amperage to increase. Circuit breakers popping or compressor cycling on overload would be common. AC power module boardThe AC power module consists of relays, dip switches, plug receptacles, and other components. If any of these are defective, the complete control box must be replaced. Replace power module board on units that are not equipped with a replaceable control box. The 3-amp fuse is the only replaceable component. The board is a signal receiver and completes AC volt circuits according to what signal it receives. Verify configuration operation before troubleshooting the AC power module. Make sure DC volts are within operation range and 115 volts are supplied to the AC power module board. For rooftop air conditioners, follow these instructions to troubleshoot:
Don’t use a voltmeter for these checks as it will give erroneous readings. If the circuit is completed and the component is not operating, the problem is the rooftop unit or the connection is not being completed through the connector. How to Clean a Dometic RV Air Conditioner FilterFor the Dometic rooftop air conditioner brisk 2 It is recommended you periodically( a minimum of every two weeks of operation)remove the return air filter located behind the return air grille and wash it with soap and warm water, allowing it to dry, and then re-install. Note that you should never run the unit without the air filter in place. Doing so would result in the evaporator becoming blocked with dust and dirt, and may substantially degrade performance over time. How to Make a Dometic RV Air Conditioner QuieterNoisy operation (cooling or heating mode) could point to a number of issues. To fix the problem and make your air conditioner quieter, check the following: Loose partsLoose parts can cause the air conditioner to operate noisily. Check for any loose bolts, any component rubbing against its housing, or plastic parts that might be cracked. Repair or replace parts as necessary to resolve any noise problems. Check this too: Norcold RV Fridge How to and Troubleshooting Guide Fan bladeThe blower motor will have either a squirrel-cage or blade-type fan attached to it. Turn the air conditioner circuit breaker to OFF. Adjust the component to make sure it is not rubbing against its housing or any plastic parts which might be cracked. Repair or replace parts as necessary to resolve any noise problems. Tubing vibrationIf any of the copper tubings is rubbing against itself or any other part, replace or position tubing as necessary. Reversing valveThe reversing valve is the heart of the heat pump. It directs refrigerant flow to the coils to achieve proper direction of flow that allows the same system to supply heated or cooled air to enter the inside atmosphere of the structure according to occupants’ desires. The reversing valve’s solenoid can be energized in either heat or cool mode of operation, depending on the type of unit you have. The solenoid on the reversing valve can be loose, which causes a humming noise during the off-cycle; especially if the blower shuts off with the compressor. Check the screw holding the solenoid coil on the reversing valve for tightness. Where is the reset button on a Dometic RV air conditioner?How Do You Reset A Dometic RV Air Conditioner?. Hold the plus (+) icon on the unit.. Maintain pressure on the '+' button while holding the 'On/Off Mode' button.. Keep pressing the buttons for three seconds until the LCD shows a '- -' symbol.. Turn off the air conditioner by pressing the 'On/Off Mode' button again.. Where is the reset button on the air conditioning unit?Look for it first around on the exterior of your machine, especially along the bottom edge near the ground. An AC's reset button is typically red and visible, so it should be easy to spot. If you don't see a reset button on the outside, it could be located inside the unit behind the service panel.
How do I reset my AC to default?How to Reset an Air Conditioner. Power down your AC. Start at your circuit breaker panel and flip the breaker that powers your AC. ... . Find the button. Most air conditioning units are equipped with a reset button. ... . Hold down the reset button for 3 to 5 seconds and then release.. Restore power to your AC.. How do I reset my Dometic comfort control?Simultaneously depress the bottom two buttons (temperature UP and DOWN) and hold. While holding these buttons down, depress the MODE button once and release. Release the two buttons previously held down. Depress the MODE button once again.
|