Rheem 64DV Troubleshooting Manual page 78

For mid & high efficiency platforms. tankless gas
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S V C 8 2 0 ( P ) P o c k e t M a n u a l P a g e
While water is flowing & unit
is attempting to ignite; check
DC volts across White &
Black wires at connector C :
8 – 16 DC Volts
Turn Power OFF then ON.
While water is flowing & unit
is attempting to ignite; check
DC volts across Red & Black
wires at connector C :
8 – 16 DC Volts
Turn Power OFF then ON.
While water is flowing & unit
is attempting to ignite; check
DC volts across Green &
Black wires at connector C :
4 – 6 DC Volts
Operate unit. IF 65 – Error
Code appears:
Replace water volume
control valve..
CAUTION: Hot water temperatures above
120 will scald. Return to original setting
once test is complete.
Check connector C .
Operate unit again. IF code
NO
Replace control board.
Check connector C .
Operate unit again. IF code
NO
Replace control board.
Check connector C .
Operate unit again. IF code
NO
Replace control board.
77
65 appears:
65 appears:
65 appears:
77

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