Check Evaporator Blower Motor And Control Board - Friedrich VERT-I-PAK VHA09K25RTQ Service Manual

Check Evaporator Blower Motor and Control Board

Check for 230
Check for 230
VAC at L and N
on ID Motor
controller
Check for 10
VDC at green
and brown
wire at pins B
Engage fan in either High or low
43
COMPONENT TESTING
VAC at
L1 to NO
HI or LI
YES
NO
board
YES
NO
and D
YES
speed
Pins B to C
Low speed 7.84 VDC +- 0.05
High Speed 9.00 VDC +- 0.05
FIGURE 714 (INDOOR BLOWER MOTOR TESTING)
Trace Wiring
back to
Contactor, IMR
Relay and
Safety Relay
Replace motor
control board
Remove
harness and
jumper pins C
and D
Does Fan run?
NO
Repair Wiring
or replace
relays/
contactor as
required
Replace Motor
controller
board
Replace Fan