37
Page
240 (T-H3J), 340 (T-H3S) and 540 (T-H3) models Service Manial
Ver. 1.00
CONFIDENTIAL
10-13. Exhaust thermistor
Part#
ͻഩϯϭϵϭϰϯͲϭϯϭ;<,ϲͿ
Unit Part#
#718
Function
DĞĂƐƵƌĞƐƚŚĞĞdžŚĂƵƐƚƚĞŵƉĞƌĂƚƵƌĞƐŝŶƚŚĞƐĞĐŽŶĚĂƌLJŚĞĂƚĞdžĐŚĂŶŐĞƌ͘
Failure events
hŶĂďůĞƚŽŵĞĂƐƵƌĞĞdžŚĂƵƐƚƚĞŵƉĞƌĂƚƵƌĞŝŶƚŚĞĞdžŚĂƵƐƚĐŚĂŵďĞƌƉƌŽƉĞƌůLJ͘
Effects on the water heater
if exhaust thermistor fails
/Ĩ ƚŚĞ ƚŚĞƌŵŝƐƚŽƌƐ ĨĂŝů ŽƉĞŶ Žƌ ƐŚŽƌƚ͕ ĞƌƌŽƌ ĐŽĚĞ ĂƉƉĞĂƌƐ ďĞĨŽƌĞ ƐƚĂƌƚŝŶŐ
ŽƉĞƌĂƚŝŽŶ͘/ĨƌĞƐŝƐƚĂŶĐĞǀĂůƵĞƐĂƌĞũƵƐƚŽĨĨ͕ƚŚĞ͞ϯϰϭ͟ĞƌƌŽƌĐŽĚĞƐǁŝůůĚŝƐƉůĂLJ͘
Error codes when exhaust
thermistor fails
341 (Direct Vent Indoor models only)
Diagnostic
ϭ͘sŝƐƵĂůŝŶƐƉĞĐƚŝŽŶ͗ĐŽŶŶĞĐƚŝŽŶͬďƌĞĂŬĂŐĞŽĨǁŝƌĞƐĂŶĚͬŽƌĚĞďƌŝƐŽŶ
impeller.
Ϯ͘ŚĞĐŬǀŽůƚĂŐĞƐ͗ƉƌŽƉĞƌƌĂŶŐĞŽĨǀĂůƵĞƐƐŚŽǁŶďĞůŽǁ͘
Color / Number of wires
White - White
ϲϴȗ&;ϮϬΣͿϭϮ͘ϲƚŽϭϯ͘ϰŬɏ
ϭϮϮȗ&;ϱϬΣͿϰ͘ϯƚŽϰ͘ϱŬɏ
ϭϳϲȗ&;ϴϬΣͿϭ͘ϳƚŽϭ͘ϴŬɏ
;ƐĞĞƚĂďůĞďĞůŽǁĨŽƌŵŽƌĞƌĞƐŝƐƚĂŶĐĞ
values)
Check
point
K1
Resistance values of thermistors as a function of temperature
Black
;džŚĂƵƐƚƚŚĞƌŵŝƐƚŽƌͿ
/ŶƐƵůĂƚŝŽŶ