went too an acct of mine cust.says walkin not cooling,check the walkin out evap, covered in ice,go down stairs too shut unit down,got knocked on my ass.getting 120v to the whole condesing unit,when i went down on my tired old knees to check conn. for any kind of leak,or any thing out of normal i had one hand on the compressor dome the other hand feeling around the flare nuts at the drier,next thing you know i am on my ass,told customer hes got a problem and iam not touching this thing,until hes calls an electrician.he says he called the elec. ayear ago when i advised him too put in a new disconnect,place had the old knob and tube wireing,jesus you think maybe some thing is not grounded.