40
Page
240 (T-H3J), 340 (T-H3S) and 540 (T-H3) models Service Manial
Ver. 1.00
CONFIDENTIAL
10-15. Hi-limit switch for exhaust
Part#
ͻഩϯϭϵϭϰϯͲϭϬϰ;<,ϲ'Ϳ
Unit Part#
#472
Function
ͲĂƐĞĚŽŶďŝͲŵĞƚĂůƚŚĞƌŵĂůĞdžƉĂŶƐŝŽŶ͘
ͲĞƚĞĐƚƐ ĞdžĐĞƐƐ ƚĞŵƉĞƌĂƚƵƌĞ ;ŵŽƌĞ ƚŚĂŶ ϭϱϭȗ& Žƌ ϲϲȗͿ ŽĨ ĞdžŚĂƵƐƚ ŐĂƐ ŝŶ
ƚŚĞĞdžŚĂƵƐƚĐŚĂŵďĞƌ͘
Failure events
ϭ͘hŶĂďůĞƚŽĚĞƚĞĐƚĞdžĐĞƐƐƚĞŵƉĞƌĂƚƵƌĞŽĨŐĂƐŝĨƐǁŝƚĐŚĨĂŝůƐΗĐůŽƐĞĚΗ͘
Ϯ͘ ŽŶƚŝŶƵŽƵƐ ĚĞƚĞĐƚŝŽŶ ŽĨ ĞdžĐĞƐƐ ƚĞŵƉĞƌĂƚƵƌĞƐ ;ƌĞŐĂƌĚůĞƐƐ ŽĨ ǁŚĂƚ ƚŚĞ
ĂĐƚƵĂůƚĞŵƉĞƌĂƚƵƌĞŝƐͿŝĨƐǁŝƚĐŚĨĂŝůƐΗŽƉĞŶΗ͘
Effects on the water heater
if hi-limit switch for
exhaust fails
ϭ͘hŶĂďůĞƚŽƐŚƵƚĚŽǁŶƚŚĞǁĂƚĞƌŚĞĂƚĞƌŝĨƚŚĞĞdžŚĂƵƐƚŐĂƐƚĞŵƉĞƌĂƚƵƌĞŝŶ
ƚŚĞĞdžŚĂƵƐƚĐŚĂŵďĞƌĞdžĐĞĞĚƐϭϱϭȗ&;ϲϲȗͿ͘
Ϯ͘ dŚĞ ǁĂƚĞƌ ŚĞĂƚĞƌ ŝƐ ĂůǁĂLJƐ ƐŚƵƚ ĚŽǁŶ ŝŵŵĞĚŝĂƚĞůLJ ĂĨƚĞƌ ƚŚĞ ŝŐŶŝƚŝŽŶ
process, and the "941" error code will display.
Error codes when hi-limit
switch for exhaust fails
941 (Direct Vent Indoor models only)
Diagnostic
ϭ͘sŝƐƵĂůŝŶƐƉĞĐƚŝŽŶ͗ĐŽŶŶĞĐƚŝŽŶͬďƌĞĂŬĂŐĞŽĨǁŝƌĞƐ͘
Ϯ͘ŚĞĐŬǀŽůƚĂŐĞƐĂŶĚƌĞƐŝƐƚĂŶĐĞ͗ƉƌŽƉĞƌƌĂŶŐĞŽĨǀĂůƵĞƐƐŚŽǁŶďĞůŽǁ͘
Color / Number of wires
White - White
>ĞƐƐƚŚĂŶϭ͘Ϭɏ
Checkpoint
K2
tŚĞŶƚĞŵƉĞƌĂƚƵƌĞƐĞdžĐĞĞĚϭϱϭȗ&;ϲϲȗͿ͕ƚŚĞƌĞƐĞƚďƵƚƚŽŶƚƌŝƉƐĂŶĚƐǁŝƚĐŚŐŽĞƐƚŽK&&ŵŽĚĞ͘
KEŵŽĚĞ͗фϭϱϭȗ&;ϲϲȗͿK&&ŵŽĚĞ͗ĂƵƚŽŵĂƚŝĐƌĞƐƚŽƌĂƚŝŽŶďĂĐŬƚŽKEŵŽĚĞ
3/4" ( 17 mm)
3/4" ( 18 mm)
1/4" (4.6 mm)
5/8" (14.5 mm)
1-3/8" (35 mm)
3/4" (18.4 mm)
3-7/8" (100 mm)
∅
∅