Amana HDC18 Microwave
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  1. #1
    Join Date
    Feb 2004
    Location
    Knox CO. KY Occupation: Residintial and Commercial instalation, service,and commercial refrigeration. Interests:4wheeling and Hunting
    Posts
    153

    Amana HDC18 Microwave

    I have one that is blowing fuses only when you try to cook. When you push a button to cook it will blow the fuse I have checked all I know. I am new to microwaves so any help would be GREAT!!
    GiT-R-Done!!!

  2. #2
    Join Date
    Feb 2008
    Location
    ga
    Posts
    80
    I'm not the best on it but sounds like microtron is shot.

  3. #3
    Join Date
    Apr 2007
    Posts
    6,285
    model number?

  4. #4
    Join Date
    Dec 2002
    Location
    central New Jersey
    Posts
    60
    Check your door switch assembly.The main fuse is designed to blow if "door interlock" switch or "monitor" switch is bad.

  5. #5
    Join Date
    Feb 2004
    Location
    Knox CO. KY Occupation: Residintial and Commercial instalation, service,and commercial refrigeration. Interests:4wheeling and Hunting
    Posts
    153
    Thanks thats the only thing I've not checked.
    GiT-R-Done!!!

  6. #6
    Join Date
    Feb 2004
    Location
    Knox CO. KY Occupation: Residintial and Commercial instalation, service,and commercial refrigeration. Interests:4wheeling and Hunting
    Posts
    153
    Tried door switch assembl thats not it. It can get an amp draw reading it is pulling 82 amps. i called amana they didn't help any eaither thanks..
    GiT-R-Done!!!

  7. #7
    Join Date
    Dec 2005
    Location
    South Bend, In.
    Posts
    529
    Quote Originally Posted by wolfman32 View Post
    I have one that is blowing fuses only when you try to cook. When you push a button to cook it will blow the fuse I have checked all I know. I am new to microwaves so any help would be GREAT!!
    You can isolate this unit in half, take off the triac
    gate wire, its the single wire across from the pair of double wires on the triac. if it doesn't blow when you put in load, close door, and press number1, then problem is in mag. side of unit. if it blows problem in control side of unit.

    If mag side -then check big transformer visually for burned up hv coil ( what i see the most, since drawing hi amps this is the main suspect, nothing else in this unit can handle that many amps more that a second or so), next is to visually check the mags at there hv connections, usually the white terminal shroud is burnt up or has a brown-blister on it. A dead give away that it is shot. next comes the caps - usually find grease or debris shorting out the terminals, then diodes for shorts to ground.
    these are all visual checks, you can also use your meter to check them out, go to amana TS manual it will tell you how to, also get with amana's tech support pretty good folks.
    to isolate mags you have to remove hv wire jumper from caps, leaving the hv wire on one cap. Run unit with small glass of COLD water if it heats up that mag circuit is good. next, move hv wire to other cap and do test.
    NOTE: if hv transformer is bad usually at least one mag circuit will be bad also.

    the control circuit consists of the op-panel, pcb, interlock switch, and wiring.these items are very close to other things we run into so I didn't cover them , but ask if you have any ?, .


    NOW YOU MUST USE CAUTION WHEN WORKING ON THIS UNIT IT CAN PUT --you--- IN THE HOSPITAL OR WORST, IF YOU DON'T GIVE IT RESPECT. 4400 VOLTS WILL KILL YOU !!!!!!!!!!!!!!!!!!!!!!!!!
    So you didn't ask, what you though was a stupid question. Now how, are you going to tell the boss about your stupid screw up?

  8. #8
    Join Date
    Feb 2009
    Location
    MASTIC BEACH
    Posts
    7
    The interlock switch will blow the main fuse in the back as a saftey if you call amana, they will tell you to change the whole interlock assembley not just the mointer switch,

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