Rheem Iconic RTGH-S11i Training And Service Manual page 56

IKONIC Tankless Water Heater Service Manual
ERROR CODE DIAGNOSTICS
2.2 ERROR CODE LIST
A055 ERROR CODE
Gas motor failed.
The venturi in this water heater has a butterfly valve
to control air volume. The motor adjusts the position
this butterfly valve. If the motor controlling the butterfly
valve does not work properly, the water heater displays
the " A055 " error code on the User Interface.
Turn Power OFF
Remove and reinsert connector "J".
Visually inspect water volume control valve
for loose or damaged connections. Reas-
semble & operate unit.
Turn power ON and operate unit.
Is "A055" error
code appeared?
Yes
While water is flowing, the unit is at-
tempting to ignite.
Measure DC voltage between #2 wire
(White) & #8 wire (Black) at connector "I"
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 #7 wire
(Red) & #8 wire (Black) at connector "J".
Unit has a loose con-
No
nection.
Unit appears to be
operating.
Check connector "J",
and operate unit again.
No
If "A055" error code
is appeared, replace
control board.
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Diagnostic check items
• Gas control motor on the venture assembly
Is the voltage
4-16 DC Volts?
While water is flowing, the unit is attempting
to ignite.
Measure DC voltage between #6 wire
(Green) & #8 wire (Black) at connector "J".
Is the voltage
4-10 DC volts?
Yes
Operare unit again.
If "A066" error code is appeared, replace
water volume control valve.
Check connector "J"
and operate unit again.
No
If "A055" error code
is appeared, Replace
Yes
Check connector "J",
and operate unit again.
No
If "A055" error code
is appeared, Replace
control board.
control board.