Rheem IKONIC RTGH-S11i Training And Service Manual page 58

IKONIC Tankless Water Heater Service Manual
ERROR CODE DIAGNOSTICS
2.2 ERROR CODE LIST
A066 ERROR CODE
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
temperature down to 102 Water bypass valve
will activate at this temperature setting.
Turn Power OFF
Remove and reinsert connector "G".
Visually inspect water volume control valve
for loose or damaged connections. Reas-
semble & operate unit.
Turn power ON and operate unit.
Is "A066" error
code appeared?
Yes
While water is flowing, 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, the unit is at-
tempting to ignite.
Measure DC voltage between #13 wire
(Red) & #15 wire (Black) at connector "G".
Unit has a loose con-
No
nection.
Unit appears to be
operating.
Check connector "G",
and operate unit again.
No
If "A066" error code
is appeared, replace
control board.
58
Diagnostic check items
• Water Bypass control valve.
Is the voltage
4-16 DC Volts?
While water is flowing, the unit is attempting
to ignite.
Measure DC voltage between #11 wire
(Green) & #15 wire (Black) at connector "G"
Is the voltage
4-10 DC volts?
Yes
Operare unit again.
If "A066" error code is appeared, replace
water volume control valve.
Check connector "G"
and operate unit again.
No
If "A066" error code
is appeared, Replace
Yes
Check connector "G",
and operate unit again.
No
If "A066" error code
is appeared, Replace
control board.
control board.