Error A066 - Rheem IKONIC RTGH-S11i Manual

ERROR CODE DIAGNOSTICS

ERROR A066

EXPLANATION
Water bypass control valve malfunction
If the bypass valve motor does not work properly, the
water heater displays the "A066" error code on the User
Interface.
NOTE: : Prior to measuring voltage, turn set tempera-
ture down to 102. Water bypass valve will activate at
this temperature setting.
Turn Power OFF
Remove and reinsert connector "G".
Visually inspect water bypass valve for loose
or damaged connections. Reassemble &
operate unit.
Turn power ON and operate unit.
Did "A066" error
code appear?
Yes
While water is flowing, and the unit is at-
tempting to ignite.
Measure DC voltage between #3 wire
(White) & #15 wire (Black) at connector "G"
Is the voltage
4-16 DC volts?
Yes
Turn power OFF then ON.
While water is flowing, and the unit is at-
tempting to ignite.
Measure DC voltage between #13 wire
(Red) & #15 wire (Black) at connector "G".
Unit had a loose con-
No
nection.
Unit appears to be
operating.
Check connector "G", and
operate unit again.
No
If "A066" error code
appears, replace control
board.
55 IKONIC Tankless Water Heater Service Manual
Diagnostic check items
• Water Bypass control valve.
Is the voltage
4-16 DC Volts?
While water is flowing, and the unit is attempt-
ing to ignite.
Measure DC voltage between #11 wire
(Green) & #15 wire (Black) at connector "G"
Is the voltage
4-10 DC volts?
Yes
Operate unit again.
If "A066" error code appears, replace water
volume control valve.
Check connector "G" and
operate unit again.
No
If "A066" error code
appears, Replace control
Yes
Check connector "G", and
operate unit again.
No
If "A066" error code
appears, Replace control
board.
board.