Rheem Iconic RTGH-S11i Training And Service Manual page 47

ERROR CODE DIAGNOSTICS
2.2 ERROR CODE LIST
Turn Power OFF
Remove connector "C" and "H" terminal on
flame rod, and reinsert them.
Turn power ON and operate unit.
Is error code
"A071" appeared?
Yes
Access maintenance mode to check flame
rod status.
Locate sight glass.
While viewing burner chamber through sight
glass: In 10 seconds intervals, cycle unit 3
times - ON-OFF; ON-OFF; ON-OFF
Is flame visible
when OFF?
Yes
Operate unit.
If the error code "A071" appears and flame
is visible while unit has been OFF longer
than 5 seconds:
Replace Gas-Air-ratio valve.
47
Unit had a loose connection or
No
foreign debris that is no longer
present.
Until appears to be operating OK.
In 10 seconds intervals, cycle unit
No
3 times by turning unit:
ON-OFF; ON-OFF; ON-OFF
Does "flame rod status" in
maintenance mode
indicate presence of flame
while unit has been off
>5 seconds?
Yes
Disconnect wires at flame rod(s).
While viewing burner chamber
through sight glass:
In 10 second intervals, cycle unit 3
times by turning unit:
ON-OFF; ON-OFF; ON-OFF
Does "flame rod status" in
maintenance mode
indicate presence of flame
while unit has been off
>5 seconds?
Yes
Replace control board
IKONIC Tankless Water Heater Service Manual
A071 ERROR CODE
Gas Air ratio valve malfunction.
If the flame rod is detecting a flame for 8
seconds when the water heater is turned
off, the water heater displays the " A071
" error code on the User Interface.
Diagnostic check items
• Flame rod
• Gas-air ratio valve
Operate unit.
No
If error code "A071" appears:
Replace control board.
Clean flame rod.
No
If the error code "A071" appears
after cleaning flame rod:
Replace flame rod.