HVAC Troubleshooting: How to Fix An HVAC Compressor That Won’t Turn On. by Darla (Twentynine Palms, CA) Question: We just purchased a used RV from a dealer and the AC worked fine for two days. If there are no lights on the thermostat, the unit may not be getting any 12-volt (DC) power. The culprit could be the capacitor, control board or thermostat. A Coleman RV air conditioner may also be out of power. AC to loser board. It is usually located near where the flames shoot out of the burners. If your car won’t start but the lights and radio work fine, it could be one of several problems, possibly including a dead battery. Then again before the furnace shuts off (fan is still running) the clicks … Do not try to fix this problem on your own. Dometic AC (Penguin II?) If your air conditioner won't turn on, it's important to troubleshoot a few key things before you call in an HVAC technician, as this can save you time and - more importantly - money. Look for a flame, and if you see one, put the furnace door back on and turn back on the power. Step 5: Check Your Blower Motor if Your Furnace Still Won’t Turn On. Common AC problems can be frustrating. Turn knob from PILOT to ON. You are driving your RV under the scorching sun and suddenly realize that the interior has turned into an oven. working heating elements The AC sensing circuit is not turning the power on when Auto is selected. This sort of issue is most often caused by a blockage in the air intake or exhaust, which causes a lack of air in the combustion chamber. This might be because your thermostat is actually on the wrong setting. If it isn’t, carefully turn it on and see if that fixes the problem. Now when we try to turn it on we get a click from the control until then nothing. Your air conditioning unit is an important component of your RV, but it won’t work on its own forever. When AC units run, they create condensation, which is removed from the unit through a drain line. As a result, you may hear the AC humming when it’s on, but it doesn’t fully turn on. Your heat won’t come on if you have a limited gas supply. Examine all wiring and ensure that the unit is plugged in. Our AC techs explain why and give you a short-term and long-term solution. Air Conditioners Will Not Turn On. You can figure out the source of the trouble and fix by yourself if you know where to look into. RV furnace clicks but won’t start. Don’t panic! The contactor is the part that controls the flow of electricity into the air conditioner. This is nothing but a ignition system failure. Here’s a few easy RV heater troubleshooting tips and basic repairs, to give you a helping hand. RV Doctor Dear Gary, I have just borrowed a 29-foot motorhome to drive to a NASCAR race. Common Causes of Air Conditioner Problems. Tips for Common AC Problems You went outside to set up a grill, and when you go back into the RV the air conditioner won’t even turn on. If your air conditioner is not working, the problem can often be pinpointed to the HVAC compressor. There could be several reasons for the compressor to act up. RV Furnace Runs Once But Won’t Restart. In order for the furnace to start running, you need to set the thermostat for a temperature that requires the air to be warmed up. To fix the furnace that won't start, turn off the power to the furnace-and turn off the gas. Just bought the RV and was working when bought - yesterday. It can also be caused by a lack of gas pressure or a gas valve which is only partially opening. Air Conditioning units (AC) on RV’s can be a great asset for those that spend a lot of time in them. by Ben L. (Mountainair, NM) Question: My Acs won’t turn on, even when plugged into the 30 amp outlet. The air conditioner works wonderful when using the extension cord and running off my electrical power but it doesn’t work at all when the generator is on. If your furnace won’t turn on, go to your furnace (if it is accessible to you), and peak in the little plastic window on the side of … Clogged Filter. The RV furnace will fire up,but for some reason won’t stay turned on. Luckily, the problem is common enough that every technician or repairman will give the same answer — it’s the control board. A three-way fridge has the options of AC, DC, and LP gas. the problem is when the blower works and the heater doesn’t ignite it is the board inside heater it will have to be pulled out and replaced it is inside your heater unit chances are if you were at a camp site and you didn’t have a device to control spikes it zapped your igniter board This sound may also indicate loose wiring, faulty electrical issues, or very simply telling you that you have dirty coils or a clogged drain. You can try to turn up … So begins the process of testing differing part of your fridge to identify the problem. Upon a close inspection, it seems that the RV air conditioner compressor not coming on.The performance of the AC system depends on its components and the compressor is a vital one. billy. by Joe ( Southern CA) Question: I just replaced my coach batteries with two 750 cold cranking amp. Hear your AC humming but the outside fan won’t kick on? Norcold gas absorption refrigerators operate off of 12V DC power (battery power). Generator just clicks. Many of issues you’re having with your AC unit can often … The prime side sounds like it is priming, but won’t turn over the generator. clicks at the unit but won't turn on. However, these may not be a very difficult situations to fix and it is possible for one to do it … Mechanic's Assistant: Where exactly do you think the noise is coming from? Sometimes, ordinary wear and tear can cause it to become stuck or melt. When you raise the thermostat to a warmer temperature, the furnace blower will turn on after about 30 seconds. If you hear one loud click as the AC tries to turn on, there’s a problem with the controls. This happens when the spark igniter try’s to ignite the pilot light but fails. Menu. Click is at the AC unit in the ceiling. 4. The reason why the radio, dash lights, headlights, and other electronics draw power while the engine doesn't has to do with the amount of current each device draws and what may be interrupting the path. Occasionally one of these systems experiences an issue causing the air conditioner to not work as it should. Gas leaks are dangerous. Your AC thermostat clicks on but only warm air is coming out of your vents. Camping is fun, but no one wants to spend a cold night without heat. Then the furnace turns on and works normally. If you own a gas furnace, make sure that your gas line has not been accidentally turned off. I noticed that just before the furnace fan kicks on, a series of clicks can be heard from the overhead A/C unit. The Causes of RV Air Conditioner Compressor Not Coming On. Before you need your RV heater, you will want to make sure it’s in good running condition, since it is used the least in your RV. Used RV AC Won't Turn On. Check the 12-volt fuses or circuits. 1. An RV air conditioner that only hums can be a sign of many issues, including an easy to fix thermostat problem, oils freezing over, low coolant or a problem with your compressor. If the DC voltage isn't working, plug the RV into shore power as soon as possible. And how long has this been going on? The furnace may make a click sound but it wont start. AC Clicks but Will Not Start. Now comes the hard part. This simply means the battery is dead. It won't run on AC. If the thermostat in your RV controls both the air conditioner and the furnace, be sure the switch is set on "Heat." Many small, inexpensive and easily replaceable parts are prone to breaking down. I have verified that we have : DC power to lower board. A Circuit Breaker Tripped. August 20th, 2017 . If you find a switch and you don’t know what it does, turn it on and try running the AC. I have the shop manual and have run some troubleshooting. A malfunctioning starting capacitor is likely to be the most common culprit. Remove the front panel and look for the ignitor/sensor. Refer to your user manual to locate the ignitor. RV Make: forest river, RV Model: fr3, RV Year: 2016, Brand: suburban. This has to be fixed and its a good idea to take technical help here. Goes right to gas. When the drain line becomes clogged, a safety switch trips and shuts down your air conditioner. You don’t need to know what a blower motor is to check that it is working properly. My Onan 550 generator just clicks as if the batteries are low. If you’ve got a gas furnace, make sure that your gas supply valve is open. The thermostat clicks but nothing happens. Below are the most common reasons your AC won’t turn on. The symptoms of a bad capacitor are: The air conditioning system creates a humming sound and tries to start but cannot. Is there a switch I must throw to get it to […] For more information, read our blog about how to tell if your AC contactor is bad or failing. This is not necessarily a death sentence for your HVAC unit. If it doesn’t, and you smell gas, it’s a good idea to turn off the gas supply and call a pro. The condenser unit won’t turn on: If your condenser unit won’t turn on at all, you may have a faulty motor or the unit may not be receiving power. Proper operation of upper boards and connection back to lower board. There are some serious problems that can cause these issues, but typically, when your AC won't turn on, you have about a 70% chance of solving the issue yourself. I checked the voltage at the generator and it is 13.6 volts DC. deep cycle batteries. Replacing something that isn’t broken won’t change anything which means you need to figure out what is broken and then replace it. 10. Gas absorption models are found in RVs while AC/ DC models are found in trucks and boats. Common RV Refrigerator Problems. The AC plug that you see in the back is only powering your AC Heater/s that will cool the refrigerator when running it on AC or Auto Mode. I was going to replace my two 6 volt batteries on my RV. You’ll want to do this gradually. Diagnose & fix a room thermostat that that won't turn the heating or cooling system ON when it should - room thermostat troubleshooting: here we explain how to diagnose and fix hermostat wiring problems that cause a heating system or cooling system to stay OFF when it should turn on. Your air conditioner might connect to one of these switches, just like your furnace probably is. If the thermostat in your RV controls only the furnace, then turn the setting to the "On" position. 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