Rheem IKONIC RTGH-S11i Training And Service Manual page 53

ERROR CODE DIAGNOSTICS
2.2 ERROR CODE LIST
Turn Power OFF
Remove connector "H" and terminal on
flame rod, and reinsert them.
Turn power ON and operate unit.
Is error code
"A072" appeared?
Yes
Turn Power OFF. Unplug unit and plug back
in. Turn Power ON.
Recycle Power While viewing through sight
glass, turn on water flow to begin ignition
sequence.
Is flame visible
before igniter rod
Yes
Operate unit.
If the error code "A072" error code appears
and flame is visible before igniter
rod sparks:
Replace Gas-Air-ratio valve.
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Unit has a loose connection or
No
foreign debris that is no longer
present.
Until appears to be operating.
No
Operate unit again
Does "flame rod status" in
maintenance mode
indicate presence of flame
before igniter rod sparks?
Yes
Turn power OFF with unplug unit
and disconnect wires at flame
rod(s).
While viewing burner chamber
through sight glass:
Operate unit again.
Does "flame rod status" in
maintenance mode
indicate presence of flame
before igniter rod
sparks?
Yes
Replace control board
IKONIC Tankless Water Heater Service Manual
A072 ERROR CODE
Flame rod malfunction
If the flame rod detects presence of
flame before ignitor is activated, the
water heater displays the " A072 " error
code on the User Interface.
Diagnostic check items
• Flame rod
• Gas-air ratio valve
Unit appears to be OK.
No
If the "A072" error code appears:
Replace control board.
Clean flame rod.
No
If the error code "A072" appears
after cleaning flame rod:
Replace flame rod.