Rheem IKONIC RTGH-S10i - Page 50

IKONIC Tankless Water Heater Service Manual
50
2.2 ERROR CODE LIST
ERROR CODE DIAGNOSTICS
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
Turn Power OFF
Remove connector "C" and "H" terminal on
flame rod, and reinsert them.
Turn power ON and operate unit.
Unit had a loose connection or
foreign debris that is no longer
present.
Until appears to be operating OK.
In 10 seconds intervals, cycle unit
3 times by turning unit:
ON-OFF; ON-OFF; ON-OFF
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
Operate unit.
If error code "A071" appears:
Replace control board.
Clean flame rod.
If the error code "A071" appears
after cleaning flame rod:
Replace flame rod.
Replace control board
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
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.
Is error code
"A071" appeared?
Is flame visible
when OFF?
Does "flame rod status" in
maintenance mode
indicate presence of flame
while unit has been off
>5 seconds?
Does "flame rod status" in
maintenance mode
indicate presence of flame
while unit has been off
>5 seconds?
Yes
No
No
No
No
Yes
Yes
Yes