Rheem IKONIC RTGH-S11i Training And Service Manual page 61

ERROR CODE DIAGNOSTICS
2.2 ERROR CODE LIST
A063 ERROR CODE
Pump abnormality
If the water flow sensor does not detect water flow
when the recirculation pump is working, the water
heater displays the "A063 " error code on the User In-
terface.
Turn Power OFF
Remove and reinsert connector "A" on the
control board and blue molex to connect to
pump.
Visually inspect for loose or damaged con-
nections.
Turn power ON and operate pump.
Is "A063" error
code appeared?
Yes
Measure DC voltage between #3 wire
(White) & #4 wire (Black) at connector
"A".
Is the voltage
108-132 DC
volts?
Yes
Replace pump (internal or external).
61
IKONIC Tankless Water Heater Service Manual
Diagnostic check
• Recirculation Pump (Internal or external).
Unit has a loose connection.
No
Unit appears to be operating.
Check connector "A" and operate unit
No
again.
If "A063" error code returns, Replace
control board.