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Page
240 (T-H3J), 340 (T-H3S) and 540 (T-H3) models Service Manial
Ver. 1.00
CONFIDENTIAL
10-12. Thermistors
Part #
*See the table below
Unit
Part#
#407 (Inlet)
#408 (Outlet )
#411 (Heat exchanger)
Function
DĞĂƐƵƌĞƐĐŽůĚͬŚŽƚǁĂƚĞƌƚĞŵƉĞƌĂƚƵƌĞƐŝŶƚŚĞǁĂƚĞƌŚĞĂƚĞƌ͘
Failure events
hŶĂďůĞƚŽƉƌŽƉĞƌůLJŵĞĂƐƵƌĞǁĂƚĞƌƚĞŵƉĞƌĂƚƵƌĞƐǁŝƚŚŝŶƚŚĞǁĂƚĞƌŚĞĂƚĞƌ͘
Effects on the water heater
if thermistor fails
/Ĩ ƚŚĞ ƚŚĞƌŵŝƐƚŽƌƐ ĨĂŝů ŽƉĞŶ Žƌ ƐŚŽƌƚ͕ ĞƌƌŽƌ ĐŽĚĞ ĂƉƉĞĂƌƐ ďĞĨŽƌĞ ƐƚĂƌƚŝŶŐ
ŽƉĞƌĂƚŝŽŶ͘ /Ĩ ƌĞƐŝƐƚĂŶĐĞ ǀĂůƵĞƐ ĂƌĞ ũƵƐƚ ŽĨĨ͕ dŚĞ ǁĂƚĞƌ ŚĞĂƚĞƌ ǁŝůů ŚĂǀĞ
ƚĞŵƉĞƌĂƚƵƌĞĨůƵĐƚƵĂƚŝŽŶƐŝŶŚŽƚǁĂƚĞƌ͘
Error codes when
thermistors fails
311 (Outlet) 321 (Inlet) 331 (Heat exchanger)
Diagnostic
ϭ͘sŝƐƵĂůŝŶƐƉĞĐƚŝŽŶ͗ĐŽŶŶĞĐƚŝŽŶͬďƌĞĂŬĂŐĞŽĨǁŝƌĞƐĂŶĚͬŽƌĚĞďƌŝƐŽŶ
thermistor.
Ϯ͘ŚĞĐŬǀŽůƚĂŐĞƐĂŶĚƌĞƐŝƐƚĂŶĐĞ͖ƉƌŽƉĞƌƌĂŶŐĞŽĨǀĂůƵĞƐƐŚŽǁŶďĞůŽǁ͘
Color / Number of wires
/ŶůĞƚůĂĐŬ;ϰϮͿͲůĂĐŬ
ϲϴȗ&;ϮϬΣͿϵ͘ϬƚŽϭϯŬɏ
ϭϮϮȗ&;ϱϬΣͿϯ͘ϯƚŽϰ͘ϰŬɏ
ϭϳϲȗ&;ϴϬΣͿϭ͘ϰƚŽϭ͘ϴŬɏ
;ƐĞĞƚĂďůĞďĞůŽǁĨŽƌ
more resistance values)
Check
point
*See the
table
below
,ĞĂƚĞdžĐŚĂŶŐĞƌ
Black (12) - Black
Outlet Black (113) - Black
EKd͗
Pictures are on the following page
Part #
Description
Checkpoint
Model
319143-214
EKK4J
Inlet thermistor
E2
240 (T-H3J) / 340 (T-H3S)
319143-465
EK137
Inlet thermistor
E2
540 (T-H3)
319143-529
EK207
Outlet thermistor
E1
240 (T-H3J) / 340 (T-H3S)
319143-190
EKK1A
Outlet thermistor
E1
540 (T-H3)
319143-096
EKK2T
Heat exchanger thermistor
E3
540 (T-H3)
*