Question about Comfort-Aire HMC24AD-1 Air Conditioner

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Energy Knight AC Blowing Fuses

I have an Energy Knight HMC24AD mini split unit. The past few years it would blow the 250V 3.15A slow blow fuse that is in the exchanger outside. I could change the fuse and have no further problems for the rest of the season. Well now as soon as I turn on the breaker it literally blows the fuse (into pieces!). I've done some reading and most talk about the contactor but this unit doesn't seem to have your standard contactor or at least it doesn't appear like others I've seen. I can not find any info on these units so any advice or suggestions would be greatly appreciated. Thanks in advance!

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  • michael_eide May 28, 2009

    I believe you're correct on how the system is controlled with the relay, rectifier bridge, etc..after taking another look. I figured it was a short also and looked for obvious signs such as rodents, bugs, anything. There is obvious signs that mice have been visiting the system outside for its insulation and we also have a number of chinese bettles but I found nothing. Anyways, I really do not know where to begin to look for a short in the circuit. There a lot of circuit boards and not really a lot of wiring. I'll actually try taking a picture and see if I can't attach it. I really appreciate the fast response and great information. Please keep it coming!

  • fougzki May 11, 2010

    Ok I am speaking in general repair.You can begin looking, start after the fuse.It should be AC source-fuse-relay switching contact- and commonly the 3.15A fuse is connected in fan. If the fuse is within outside exchanger most probably it is connected to the fan of the exchanger. Do you happen to see the exchanger fan run? If not then it is a strong probability. Since it is visited by a mice check also it wirings, could be an open in the insulation and touching each other or the chassis. Don't forget also to check the terminal block(if ever it have) could be corrossion and help in making chassis ground or terminal bridging. And also does the fan have a capacitor? check it also if defective. Dry up capacitor act as a shorting wire if defective. And for the last is the fan itself(stuck, dirty, burned).

    Hope I give you some informational data.
    Goodluck and regards.

  • fougzki May 11, 2010

    You have a short circuit in the system. Is this is on a control module? Could be this unit is controlled by an electronic controller using a relay together with a bridge diode, filter capacitor and a control IC. That is why you are not seeing any contactor.

    And commonly since it is aircon insect, house lizard, and dirt can do short circuit in the system.


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My Energy Knight mini split air conditioner does not come on at all, no sound no lights nothing. I have changed the batteries with no luck. please help

Posted on Jul 12, 2010

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