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Troubleshooting Lack Of Power At AC Unit, Thermostat, And Vents


No power to a/c, tstat or maxair fan


Expert Reply:

If you're not getting power to your AC system # AT15028-22, thermostat, or MaxxAir vent then your issue lies with your power source. The thermostat and vent both run off of 12v DC (which comes from your battery) and the AC unit runs off of 115v AC (shore power/generator power).

If neither of these are working and you're battery is fully charged and you're hooked up to shore power then most likely your power center has blown fuses/circuits. Power centers are usually close to the ground, typically under the fridge if you have a built in unit, and look somewhat like part # PD4135K.

You'll want to open up the cover and check that your circuit breakers aren't tripped and that your fuses aren't blown. If they are all in working order then you know power is leaving the power center and going to the units.

The next step would be to check the power wires at the units with a digital multimeter # PT89ZR. If you have 12v DC at your thermostat and MaxxAir vent and 115v AC at your AC unit then you know the issue is with the units themselves.

If you don't have power at your units or are receiving less than 115v AC or 12v DC then the issue is with your wiring, either the gauge of the wire needs to be increased or there's damage in the wiring that will need to be fixed. One other thing to check is your ground wires. If you don't have a proper ground none of your equipment is going to work.

expert reply by:
Kevin C

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