Haier HRN-186 Service Manual page 24

Electric insulation has deteriorated due to being affected with damp, thus resulting in slight electric
leakage.
2) Serious electric leakage
Refrigerator case has become live due to faults occurred in some electric devices or the erroneous
wiring in installing power cord plug or outlet by the user. This is very dangerous.
3) Electric leakage test
a) Slight electric leakage
A tingle sense will be experienced as soon as you touch the metal parts of the refrigerator with your
hand .When you test them with a test pencil ,its neon lamp will come on .In that case ,the first thing
you need to do is to determine whether the grounding is perfect .If the grounding is no problem ,turn off
the refrigerator immediately ,then check the insulation of electric circuits with an avometer .
b) Serious electric leakage
Never touch the case body of the refrigerator ,its door handle or other metal parts with your hand .Test
the refrigerator with a test pencil ,it will light up intensively ;measure the resistance between the power
cord plug and the case body with an avometer ,the reading will be zero (0 ); in the worst case ,the
fuse will be blown .Check the 3-prong outlet to see whether the live wire and the null line are inversely
connected ,this makes the ground protection lead-out from the power cord plug being connected to the
live wire .Another possibility is that the live wire and null line of the outdoor power supply circuit have
been inversely connected accordingly ,this makes the null line become a live wire .
G .Stronger vibration and loader noise
1) Refrigerator placed improperly
a) Uneven ground
Uneven ground will cause the refrigerator to be placed unsteadily ,causing stronger vibration and
noise during its operation .
b) Leveling screws not properly adjusted
If the leveling screws on refrigerator legs have not been adjusted properly ,vibration and noise will still
occur even if the refrigerator has been placed on a level ground .
2) Abnormal noise from compressor