Rheem 64DV - Page 87

86 | P a g e S V C 8 2 0 ( P ) P o c k e t M a n u a l
86
Blower Motor Diagnostics:
Indoor Models ONLY
Upper Right-Hand Corner of Control Board
Test DC voltage across
Black and Red wires
on connector G:
144 – 192 DC Volts
YES
Remove & reinsert G.
Operate unit again.
IF Code 79 appears:
Replace control board.
NO
Hold down MAX button.
Test DC voltage across
Black & White wires
on connector G:
12 – 18 DC Volts
YES
Remove & reinsert G.
Operate unit again.
IF Code 79 appears:
Replace control board.
NO
Hold down MAX button.
Test DC voltage across
Black & Blue wires
on connector G:
4 – 10 DC Volts
YES
Remove & reinsert G.
Operate unit again.
IF Code 79 appears:
Replace blower motor.
NO
Control board and blower
motor are OK.
CHECK GAS SUPPLY &
VENTING.
IMPORTANT: While performing
voltage checks, DO NOT touch
multimeter leads across BLUE &
White wires. Damage may occur to
blower motor and control board.
Connector Location
On Page 14
MIN
MAX