Heat Exchanger - A.O. Smith T-H3J-DV Service Manual

10-7. Heat exchanger

Part#
Function
Failure events
Effects on the water heater
if the heat exchanger fails
Error codes when
the heat exchanger fails
Diagnostic
Color / Number of wires
NOTE: Pictures are on the following page
*
319143-525
319143-526
319143-527
319143-528
240 (T-H3J), 340 (T-H3S) and 540 (T-H3) models Service Manial
*See the table below
Absorbs heat from combustion and transfer it to water through the heat
exchanger pipes.
1. Clogged heat exchanger fins and/or cracks on the heat exchanger walls.
2. Leaking exhaust gas.
3. Improper heat transfer can cause the water in heat exchanger to boil.
1. Water leakage from the heat exchanger.
2. Exhaust gas leakage (if this occurs, an overheat cutoff fuse is in place to
detect this event and immediately stop the water heater from operating)
3. Abnormal sounds during combustion .
1. Visual inspection: soot deposits, cracks on the heat exchanger walls, and/
or water leakage from the heat exchanger.
2. In the event of abnormal sounds during combustion:
A. Inspect for soot buildup inside the heat exchanger.
B. Inspect for scale buildup inside the heat exchanger pipes. Scale
buildup obstructs proper heat transfer to the water, thereby
overheating the heat exchanger and causing damage.
Part #
EK198 240 Indoor (T-H3J-DV) / 340 (T-H3S-DV)
EK199 240 Outdoor (T-H3J-OS) / 340 (T-H3S-OS)
EK200 540 Indoor (T-H3-DV)
EK206 540 Outdoor (T-H3-OS)
28
N/A
N/A
Model
Page
CONFIDENTIAL
Ver. 1.00
Unit
#401
Part#
Checkpoint N/A