Error A055 - Rheem IKONIC RTGH-S11i Manual

ERROR CODE DIAGNOSTICS

ERROR A055

EXPLANATION
Gas motor failed.
The venturi in this water heater has a butterfly valve to
control air volume. The motor adjusts the position of 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 gas control motor for
loose or damaged connections. Reas-
semble & operate unit.
Turn power ON and operate unit.
Did "A055" error
code appear?
Yes
While water is flowing, and the unit is at-
tempting to ignite.
Measure DC voltage between #2 wire
(White) & #8 wire (Black) at connector "J"
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 #7 wire (Red)
& #8 wire (Black) at connector "J".
Unit had a loose con-
No
nection.
Unit appears to be
operating.
Check connector "J", and
operate unit again.
No
If "A055" error code
appears, replace control
board.
51 IKONIC Tankless Water Heater Service Manual
Diagnostic check items
• Gas control motor on the Venturi assembly
Is the voltage
4-16 DC Volts?
While water is flowing, and the unit is at-
tempting to ignite.
Measure DC voltage between #6 wire
(Green) & #8 wire (Black) at connector "J".
Is the voltage
4-10 DC volts?
Yes
Operate unit again.
If "A055" error code appears, replace gas
control motor.
! CAUTION: Hot water temperatures above 120 will
scald. Return to original setting once test is complete.
Check connector "J" and
operate unit again.
No
If "A055" error code
appears, Replace control
Yes
Check connector "J", and
operate unit again.
No
If "A055" error code
appears, Replace control
board.
board.