Rheem 64DV - Error Code

S V C 8 2 0 ( P ) P o c k e t M a n u a l P a g e 67
67
(See maintenance mode instructions on page 21)
51 – Error Code
Explanation: Gas control valve malfunction. Unit
detected the presence of flame when demand for hot
water terminated & the unit turned OFF.
Diagnostic Checks:
 Flame rod(s)
 Gas control valve
Connector Location
On Page 14
Turn Power OFF.
Remove and reinsert connector M, T,
and terminal on flame rod(s).
Turn Power ON. Operate unit.
Did 51 – Error Code appear?
Indoor models – 2 flame rods (Connectors M& T).
Outdoor models – 1 flame rod (Connector M).
Access maintenance mode
to check flame rod status.
Locate sight glass.
Continue to diagnostic chart
on next page
YES
Unit had a loose connection
or foreign debris that is no
longer present.
Thermistors appear to be
OK.
NO
Connector Location
On Page 14
SIGHT GLASS
FLAME ROD(S)