Main Control Board - Haier GE GDF450P R0 Series Technical Service Manual

Main Control Board

Diagnosing the machine control board is covered in this section. Many components can be checked
from the main control, which can be accessed with the door on or removed if needed. Some
connectors are located through the bottom cover to allow easy access to the AC supply connector, door
harness and ACM or Appliance Control Module. The ACM or smart appliance allows the appliance to
communicate with the utility meter when peak rates occur, and allows the appliance to respond and
operate in a manner that will reduce energy usage of that appliance at high/critical demand rates. For
more on the module and display, refer to the separate smart appliance documents. The machine
control board houses all the logic.
The service LED has a continuous flash which only advises the main control has power. The service
LED no longer has any blink patterns which were used to aid diagnostics in the past.
WARNING: GEA Factory Service Technicians are REQUIRED to follow Lockout / Tagout (LOTO)
6 Step Process prior to beginning repair.
J603
DC Harness
Connector
J202
Power Supply
Connector
Connector
Not Used
Machine Control
Top View
User Interface and Detergent
Dispenser Connector
RJ45
Connector
Machine Control
Bottom View
– 43 –
J503
Heater
Connector
Drain Pump
Fuse
Circulation
Pump Fuse
J504
Drain and Wash
Pump Motors
Connector
J401