SERVICE MANUAL
Model: BD-429GAA
22
Issue 2009-03-09
Rev.
Ref0903S021V0
8-2-10 Cabinet cannot be started
When switching on power, the cabinet cannot be started. Determine first that the failure is caused by
inside or outside factors. The factors may be:
1
1
.
.
Outside
factors
(
(
1
1
)
)
The fuse is burned, or the contact of plug and socket is not well, or the voltage is too low.
(
(
2
2
)
)
The knob of temperature controller is set to off position.
2
2
.
.
Inside
factors
(
(
1
1
)
)
Electrical problem of cabinet (normally caused by connection terminals coming off or not in
good contact).
(
(
2
2
)
)
Temperature controller out of order (contact point are burned or switch element is damaged,
etc.).
(
(
3
3
)
)
The starter relay or overload protector is bad. A bad starter normally is caused by a burn a
contact points or the welded point has come off; a bad thermal protection unit is normally
caused by burn contact points or a bad heating wire.
(
(
4
4
)
)
The motor winding is burned.
(
(
5
5
)
)
The compressor shaft is broken and blocking the cylinder.
8-2-11 Operation of cabinet is not normal
Cabinet starts when power is switched on, but after a few seconds or 1-2 minutes, it stops
automatically and will start again in several minutes. It stops again within a very short time period after
starting. If it runs like this Continuity and cannot work normally; there are several reasons for this
matter:
1
1
.
.
Big fluctuation of voltage
The voltage required for proper operation is 110-120 Volts. If the voltage is too high, the current flowing
through the starter will increase accordingly. When it exceeds the permissible value, the starting
contact point will keep in connection state for a long time and cannot be released in time (at normal
situation, the motor starting coil will cut off in about 1s after starting). This will make the coil
temperature rising rapidly, and then the thermal protection unit cuts off the circuit and stop operation.
When power is cut off, the temperature of thermal protection unit reduces quickly and will switch power
on when reaching the reset temperature. At this time, if the contact point has not been released, the
starting contact point could not contact tightly and it is in false connection. This will make the
