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MSC4000 - MSC15000 USER GUIDE
9.
Diagnostic Codes
9.1
Diagnostic Code “E1” Shutdown on Open Dew Point Circuit
The dew point sensing circuit is devised of three parts. The dew point probe, cable and digital
control board. The combination of these parts measures the air temperature leaving the
evaporator.
There are two connections in the dew point sensing circuit, one between the probe (inserted in the
right side of the evaporator) and cable, and one between the cable and the control board. If either
of these two connections is broken a diagnostic code of “E1” will appear on the control board
display, after 10 seconds the dryer will shut down. The dryer will not be able to be restarted until
the problem is corrected.
The easiest way to correct this is to check all connections to make sure they are secure. If they
are and you are still experiencing the problem, there is a possibility there is an internal break in the
sensing circuit without the circuit-shorting out.
To locate the break, here is the sequence of steps to be taken:
1.
Locate the connection between the probe and the cable and disconnect it. Make sure
it is secured above the compression fitting. The connection hanging low could attract
condensation from the probe compression fitting. This water could get into the connection
causing an open circuit.
2.
Looking at the female end of the cable connection note the five terminal points arranged in a
clock-like fashion, 9, 11, 12, 1 and 3 o’clock.
3.
Taking a piece of insulated wire stripped on both ends; place the ends into the 9 and 3 o’clock
positions. If the digital display then changes to “E2” the break is in the probe.
4.
If the display remains at “E1” disconnect power from the unit and disconnect the cable (probe
1) from the main dew point control board.
5.
Looking at the male connection (labeled as Probe 1) terminals on the control board, number
them 1, 2, 3, respectively from left to right facing the back of the board with the board in an
upright position the way it is mounted in the dryer.
6.
Take a jumper wire and attach the ends to terminal 1 and 2. Reapply power. If the display
changes to “E2” the break is in the cable. Replace the cable. If the display remains “E1” the
break is in the board. Replace the board.
9.2
Diagnostic Code “E2” Shutdown on Shorted Dew Point Circuit
The dew point sensing circuit is devised of three parts. The dew point probe, cable and digital
control board. The combination of these parts measures the air temperature leaving the
evaporator.
If a short should occur somewhere in the dew point sensing circuit, a diagnostic code of “E2” will
appear on the control board. After 1 a seconds of this condition the dryer will shut down. The
dryer will not be able to be restarted until the problem is corrected.
To determine which component is at fault, first find the two connections in the sensing circuit, one
between the dew point probe and cable, and one between the cable and digital control board.
Then follow these simple steps.
1.
Locate the connection between the probe and the cable and disconnect it. Make sure
it is secured above the compression fitting. The connection hanging low could attract
condensation from the probe compression fitting. This water could get into the connection
causing an open circuit.
