48
Page
240 (T-H3J), 340 (T-H3S) and 540 (T-H3) models Service Manial
Ver. 1.00
CONFIDENTIAL
Natural of Fault
Diagnosis
Check
point
ͻdŚĞŚŽƚǁĂƚĞƌƚƵƌŶƐ
cold and stays cold
ϭŚĞĐŬǁŚĞƚŚĞƌƚŚĞĨůŽǁƌĂƚĞŝƐŚŝŐŚĞŶŽƵŐŚƚŽŬĞĞƉƚŚĞǁĂƚĞƌŚĞĂƚĞƌ
running.
ϮŚĞĐŬŝĨƚŚĞƌĞŝƐĂƌĞĐŝƌĐƵůĂƚŝŽŶƐLJƐƚĞŵŝŶƐƚĂůůĞĚĂŶĚĐŚĞĐŬĂůƐŽŝĨƚŚĞ
recirculation line has enough check valves.
ϯŚĞĐŬƚŚĂƚƚŚĞĨŝůƚĞƌŽŶƚŚĞĐŽůĚǁĂƚĞƌŝŶůĞƚŝƐĐůĞĂŶ͘
ϰŚĞĐŬƚŚĂƚƚŚĞĨŝdžƚƵƌĞƐĂƌĞĨƌĞĞĨƌŽŵĚĞďƌŝƐĂŶĚŽďƐƚƌƵĐƚŝŽŶƐ͘
ͻdŚĞĨĂŶŵŽƚŽƌŝƐ
ƐƚŝůůƐƉŝŶŶŝŶŐĂĨƚĞƌ
operation has stopped
ϭdŚŝƐŝƐŶŽƌŵĂůŽƉĞƌĂƚŝŽŶ͘ĨƚĞƌŽƉĞƌĂƚŝŽŶŚĂƐƐƚŽƉƉĞĚ͕ƚŚĞĨĂŶŵŽƚŽƌ
ŬĞĞƉƐŝƚƐƌƵŶŶŝŶŐϭϱƚŽϳϬƐĞĐŽŶĚƐŝŶŽƌĚĞƌƚŽƌĞͲŝŐŶŝƚĞƋƵŝĐŬůLJ͕ĂƐ
ǁĞůůĂƐƉƵƌŐĞĂůůƚŚĞĞdžŚĂƵƐƚŐĂƐŽƵƚŽĨƚŚĞĨůƵĞ͘
ͻďŶŽƌŵĂůƐŽƵŶĚ
ĨƌŽŵǁĂƚĞƌŚĞĂƚĞƌ
ϭŚĞĐŬƚŚĞŐĂƐƚLJƉĞŽĨƚŚĞǁĂƚĞƌŚĞĂƚĞƌ͘
2 Check how long the water heater has been installed and in use.
3 Check the installation place.
ϰŚĞĐŬƚŚĞĂůƚŝƚƵĚĞͬĞůĞǀĂƚŝŽŶŽĨĂƌĞĂŽĨǁŚĞƌĞƚŚĞǁĂƚĞƌŚĞĂƚĞƌ
installed.
5 Check the vent length, when the water heater has been installed
indoors.
ϲŚĞĐŬŝĨƚŚĞƌĞŝƐĂŶLJďůŽĐŬĂŐĞŝŶƚŚĞŝŶƚĂŬĞĂŝƌĂŶĚͬŽƌĞdžŚĂƵƐƚ͘
ϳŚĞĐŬŝĨƚŚĞƌĞŝƐĚƵƐƚĂŶĚůŝŶƚŝŶďƵƌŶĞƌĂŶĚŚĞĂƚĞdžĐŚĂŶŐĞƌ͕ǁŚĞŶ
the water heater has been installed in laundry room.
ϴŚĞĐŬŝĨƚŚĞƌĞŝƐŐƌĞĂƐĞĂŶĚĚŝƌƚŝŶďƵƌŶĞƌĂŶĚĨĂŶŵŽƚŽƌ͕ǁŚĞŶƚŚĞ
water heater has been installed in restaurant.
ϵŚĞĐŬƚŚĞŵĂŶŝĨŽůĚƉƌĞƐƐƵƌĞŝŶƚŚĞǁĂƚĞƌŚĞĂƚĞƌ͘
Natural of Fault
Diagnosis
Check
point
ͻ&ůƵĐƚƵĂƚŝŽŶŽĨŚŽƚ
water temperature
ϭŚĞĐŬǁŚĞƚŚĞƌƚŚĞĨŝůƚĞƌŝŶĐŽůĚǁĂƚĞƌŝŶůĞƚŝƐĐůĞĂŶĞĚ͘
ϮŚĞĐŬǁŚĞƚŚĞƌƚŚĞŐĂƐƐƵƉƉůLJƉƌĞƐƐƵƌĞŝƐĂĚĞƋƵĂƚĞ͘
ϯŚĞĐŬĨŽƌĐƌŽƐƐĐŽŶŶĞĐƚŝŽŶƐďĞƚǁĞĞŶĐŽůĚǁĂƚĞƌůŝŶĞƐĂŶĚ
hot water lines.
ϰ&ĂƵůƚŽĨWŝŶƚŚĞǁĂƚĞƌŚĞĂƚĞƌ
ഩϭEŽǀŽůƚĂŐĞƚŽŐĂƐƐŽůĞŶŽŝĚǀĂůǀĞ;^s
1
).
Normal: 93 to 120 VDC between COM (blue) & #9 (green)
(during operation)
ഩϮEŽǀŽůƚĂŐĞƚŽŐĂƐƐŽůĞŶŽŝĚǀĂůǀĞ;^s
3
).
Normal: 93 to 120 VDC between COM (blue) & #73 (red)
(during operation)
C
5 Gas solenoid valve (SV
1
ͿĨĂƵůƚ
ഩϭŝƐĐŽŶŶĞĐƚĞĚǁŝƌŝŶŐƚŽŐĂƐƐŽůĞŶŽŝĚǀĂůǀĞ;^s
1
)
EŽƌŵĂů͗ϭ͘ϯϱƚŽϭ͘ϲϱŬɏďĞƚǁĞĞŶKD;ďůƵĞͿΘηϵ;ŐƌĞĞŶͿ
ഩϮŝƐĐŽŶŶĞĐƚĞĚǁŝƌŝŶŐƚŽŐĂƐƐŽůĞŶŽŝĚǀĂůǀĞ;^s
3
)
EŽƌŵĂů͗Ϯ͘ϬϳƚŽϮ͘ϱϯŬɏďĞƚǁĞĞŶKD;ďůƵĞͿΘηϳϯ;ƌĞĚͿ
C