A.O. Smith T-KJr2-OS User Manual

110 Indoor / 110 Outdoor Service Manual
Ver. 1.01
42
CONFIDENTIAL
Error Code
Malfunction description Cancellation method
61
Fan motor fault
Turn off the power or water supply
Diagnosis Checkpoint
1 PCB and fan motor fault (Refer to section 10-3 & 10-14)
Visual inspection of fan motor: connection/breakage of wires or dust
buildup (causing electrical shortage)
Normal: 110 to 160 VDC between red & blue (during operation)
Normal: 13 to 17 VDC between yellow & blue (during operation)
Normal: 2.0 to 6.5 VDC between orange & blue (during operation)
Verify fan motor speed of the water heater using the "diagnostics mode" of
the 9007666005 temperature remote controller. See the "12-1. How to
diagnose the water heater using the 9007666005.”
Visual inspection of PCB: connection/breakage of wires and/or burn marks
on the computer board.
G
Error Code
Malfunction description Cancellation method
70
1 PCB fault
[1] Fault of preparation for the outlet thermistor
operation
[2] Fault of driving circuit for Gas Proportional
Valve(VG
0
)
Turn off the power or water supply
Diagnosis Checkpoint
1 Check the PCB and/or gas proportional valve
(Refer to section 10-4 & 10-14)
Visual inspection PCB: connection/breakage of wires and/or burn marks on
the computer board.
Visual inspection gas proportional valve: connection/breakage of wires of
the gas proportional valve.
Normal: 20
to
40
Ω between (white) & (red)
H1
Error Code Malfunction description Cancellation method
72
False flame detection
Turn off
the power or water supply
Diagnosis Checkpoint
1 False flame detection (5 sec.)
Flame rod (Insulated resistance) fault
I

A.O. Smith T-KJr2-OS Specifications

General

Brand	A.O. Smith
Model	T-KJr2-OS
Category	Water Heater
Language	English