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Whether you have an air conditioner or a heat pump in your RV, here’s a list of things to check before you call for a technician:

  • Setting the thermostat on its minimum temperature setting and the fan on low speed in high humidity situations can cause evaporator freeze-up.
  • If the air conditioner/heat pump doesn’t run (the fan and/or the compressor), check the AC voltage. Look at the breaker in the electrical panel.
  • If the thermostat has no lights showing, it means it is not receiving DC power. The 12-volt DC fuse should be checked.
  • When the fan runs and the compressor tries to start but won’t run, check the RV’s power cord, plug and receptacle. If those are in working order, check the AC voltage. Inside your RV connect the leads of a voltmeter to a receptacle and start your air conditioner or heat pump. Once the compressor has been running for two minutes, check your voltage. It must be at least 103.5 volts for the air conditioner to operate.
  • If the fan runs, but the compressor cycles on and off and doesn’t cool correctly, it could be poor air flow due to a dirty filter, dirty condenser or a duct leak. Low AC voltage may also be the problem.

3 Responses to “Troubleshooting Your Air Conditioner”

  • mel guidry:

    When the ac is put on the fan blows cold air , then after 10 to 15 minuets it just humms, no blowing or cold air. What can cause this?

  • Joe:

    it could be alot of things. i would pull the filter when it stops blowing cold n see if it is frozen up. There will b ice behind the filter on the fins. this stops the air flow. If this is your problem then you can turn it to FAN ONLY and try a hair dryer to speed the prosses but make sure it is compleatly thawed before turning it back to cool or it will just freez again

  • bill:

    plugged into 30amp juice to my overhead fan nothing to air cond flipped breaker numerousa times wont come on at thermostst just like the aircond is not getting electricity

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