81
VIII.
VIII.
Troubleshooting
Troubleshooting
Control Module
Control Module
–
–
Heater Relays
Heater Relays
HINT:
Occasionally, a heater relay
terminal soldered to a #
266746
,
263832
or
264461
control module pc
board can burn
or have insufficient
solder
.
If so, do not resolder the
relay, but replace the control
module.
The heater relay is the
largest
of three
relays in the center of the pc board & can
be one of two colors:
Black
Orange
HINT: Faulty heater
relays can cause
modules to count down
to “1” and stop.
NOTE: Replace all faulty
control modules and
hold them for (60) days
for possible return for
analysis. Do not
resolder control module
pc boards.
For
SHU 430x/53
models, reuse existing jumper
(#
167782
) for replacement module (SHU 53 shown).
Good board
-- showing proper
soldering on back of pc board.
Burned board
-- showing burned
terminal on back of pc board.
