Troubleshooting Tests - Maytag MDG25PN Service Manual

Electrical Shock Hazard
Disconnect power before servicing.
Replace all parts and panels before
operating.
Failure to do so can result in death or
electrical shock.
nOTE: These checks are done with the dryer
unplugged or disconnected from power.
TEST #1: Supply connections
This test assumes that proper voltage is
present at the outlet, and visual inspection
indicates that the power cord is securely
fastened to the terminal block (electric dryer)
or wire harness connection (gas dryer).
ELEcTric DrYEr
1. Unplug dryer or disconnect power.
2. Remove the cover plate from the upper right
corner of the back of the dryer. (See photo
page 6-4).
3. With an ohmmeter, check for continuity
(0 Ω) between the neutral (N) terminal of
the plug and the left contact on the terminal
block. See illustration in right column.
• If there is no continuity (0 Ω), make sure
the white wire is at the left position on the
terminal block. If not correct the wiring. If it
is, then replace the power cord and test the
dryer.
• If wired correctly and there is continuity
(0 Ω), go to step 4.

TrOuBLESHOOTinG TESTS

4. In a similar way, check which terminal of the
plug is connected to the right-most contact
on the terminal block and make a note of
it. This will be L1 (black wire) in the wiring
diagram.
• When this is found, it is used in step 5.
• If none of the plug terminals have
continuity (0 Ω) with the left-most contact of
the terminal block, replace the power cord
and test the dryer
• Do the same with right-most terminal.
5. Access the machine control electronics
without disconnecting any wiring to the
dryer control boards.
6. On model 22: with an ohmmeter, check for
continuity (0 Ω) between the L1 terminal of
the plug (found in step 4) and black wire on
the dryer step down transformer.
On model 25: with an ohmmeter, check for
continuity (0 Ω) between the L1 terminal of
the plug (found in step 4) and black wire at
terminal P9-2 on CCU.
• If there is continuity (0 Ω), go to step 7.
• If there is no continuity, check that wires
on the terminal block are mechanically
secure. If not, tighten securely, if this
cannot be accomplished, replace the
terminal block assembly. If secured tightly,
and no continuity, replace the main wire
harness and test the dryer.
6-3