!
Revision!1.1!+!Dec!5,13!
Error
Code
Description
Actions
52
On units manufactured
before Feb, 2013, Error 52
could be caused by an
Open Circuit detected from
the Motor on the MCB
(called Error 57 on units
built after Feb, 2013) or a
short circuit on the MCB.
Check if there is a P on the
MCB’s LED window. If so
this confirms a short.
Note: YOU MUST
complete a thorough
Motor Test to see if it is
damaged and causing the
short in the MCB. If a
damaged motor is
causing the MCB to short
and you install a new
MCB without changing
the motor then the new
MCB will short
immediately.
Check the motor wires (+ & -) are correctly attached to the MCB. Test.
Quick Motor Functionality Test using a 9V Battery:
Remove the Drive Belt that is connected to the Drive Motor Pulley so the motor can turn easily.
Remove the Motor Wires and connect a 9V battery to the positive and negative connectors. When the
motor wires make contact with the battery terminals the motor should spin.
Thorough Motor Test:
Place a multimeter pin in each motor wire connector and check the resistance.
You should get a reading between 0.9 & 1.6 OHMS. If you get a slightly lower or higher reading then
turn the flywheel a small amount and test again. A slightly higher or lower reading can be caused if the
reading was taken between poles (e.g. lower than 0.9 or up to 4 ohms). If you get “OL” (Overload) on
the multimeter then you have an open circuit in the motor and will likely have it in every position you try
to take a reading. The above-mentioned Quick Motor Functionality Test would fail if you have an open
circuit. You need to confirm if the “OL” is being caused by the Motor Brushes not making contact with
the commutator or an error inside the motor.
Check the Motor Brushes are making good contact with the commutator then it is possible that the
circuit has been opened inside the motor causing the “OL” which requires a motor change.
If you get a correct reading between 0.9 and 1.6 Ohms with the 1
st
reading then continue to test the
motor in 11 more position. Rotate the motor flywheel (e.g. from 12 o-clock to 1 o-clock) and ensure the
flywheel comes to a complete stop and take another reading. After each reading rotate the flywheel to
the next position, stop, then take another reading. A good motor will have all the readings (except if
between poles) between 0.9 and 1.6 Ohms. A bad motor may have a lot of readings outside the range.
Check if the Motor Brushes are touching the commutator. Are they worn? If so, clean with fine
sandpaper and reinsert. Test. You may need to replace the Motor Brushes.
-
IMPORTANT: You must check if the MCB failure was caused by a short in the motor (see above
instructions) or
Change Motor Control Board
Most likely problem for Error 52 is that it is a Short Circuit on one of the power transistors (MOSFET) on
the MCB
