A.O. Smith T-H2-DV Service Manual page 48

Error Code
Disconnected/short-circuited exhaust thermistor
(T-H2-DV only)
341
1 Exhaust thermistor fault
V isual inspection: connection/breakage of wires and/or debris on
thermistor.
Check voltage/resistance between white & white (#52).
Refer to Section 8 (B) for proper range of values.
Error Code
Disconnected AFR rod
391
1 AFR rod fault
V isual inspection: connection/breakage of wires, soot on it.
Error Code
Flow sensor failure (Easy-Link system only)
441
1 Flow sensor failure
V isual inspection: connection/breakage of wires and/or debris on impeller.
Check voltage/resistance between (red & black) or (white & black)
Malfunction description
Malfunction description
Malfunction description
T-H2-DV/T-H2-OS Service Manual
Turn off the power or water supply
Diagnosis
(Refer to section 10-13)
Turn off the power or water supply
Diagnosis
(Refer to section 10-7)
Turn off the power or water supply
Diagnosis
(Refer to section 10-10)
48
CONFIDENTIAL
Ver. 1.01
Cancellation method
Checkpoint
Cancellation method
Checkpoint
Cancellation method
Checkpoint
K1
I
H2