RV converter fan won’t shut off?

Are you an RV owner facing the same troubles of your converter fan not shutting off despite all attempts to get it to? You’re not alone! Many people face this issue, but luckily there are a few possible solutions.

Possible Causes

  • The most likely culprit is either a faulty temperature switch or cooling fan motor assembly. If one or both has failed then the fan will continue to run with no way of turning it off until you replace them.
  • Another possibility could be that the fuse for your converter is bad, especially if it’s been in use for a long time and hasn’t been replaced recently. This can result in the fan continually running as long as power is supplied to it.
  • The converter fan is running all the time because it can’t keep up with the load. I think that there might be a bad battery, so you should check your cells and cables to see if anything needs replacing or repairing before things get worse.

Troubleshooting & Solutions

  • Testing Your Temperature Switch: The first thing you should check is the temperature switch, as this is most likely the cause of your troubles if nothing else has worked. To test it, unplug your converter from its power source and locate the temperature switch near the cooling fan assembly. If it’s still connected to power, you will need to disconnect it first before proceeding to testing. Use a multimeter to check continuity across its terminals; if there’s none then replace the switch with an identical one.
  • Checking & Replacing Your Cooling Fan Motor Assembly: If testing reveals that your temperature switch is working properly but your fan still won’t shut off, then your next step should be checking and replacing the cooling fan motor assembly. To do this, you will need to access it from the outside of your RV and remove any screws or fasteners that are holding it in place. Once removed, use a multimeter to check the continuity across its terminals; if none is present then replace the entire assembly with an identical one.
  • Checking Battery: If all else fails, check your RV battery. If there’s something wrong with it such as a bad cell or cable then this can result in the converter fan running constantly due to overloading. To test your battery, you will need to disconnect it from its power source and use a multimeter to measure voltage across each of its cells; if any of them are below 12 volts then you should replace them with identical ones.

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In conclusion, if your RV converter fan won’t shut off despite all attempts to get it to, there are some simple troubleshooting steps you can take to try and resolve the issue. First check for faulty temperature switch or cooling fan motor assembly – replacing either of these should help solve the problem. If they appear to be working properly then you should check your RV battery and replace any bad cells or cables that are found. Following these steps should help you get your converter fan running normally again.


This is normal. The fan in your conversion will always run if there are enough 12V loads on the converter. Your furnace will need enough current to run on the fan of your converter.

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