Troubleshooting - American Water Heater Ultra Low NOx 104 Series Instruction Manual

Complaint
*Water not hot enough
*Insufficient hot water
*See WATer TeMPerATUre
CONTrOl WArNING (on page
12).
Water temperature too hot.
rumbling.
Ticking or metallic sounds.
Pounding or water hammer.
Water leaks.
Gas odors.
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trouBleshooting

Cause
Thermostat set too low.
Upper and/or lower temperature
probe out of calibration.
Thermostat set too low.
Upper and/or lower temperature
probe out of calibration.
Main manual gas shutoff valve
partially closed.
Heater too small for demand.
Heater recovery is slower.
Thermostat set too high.
Sediment accumulation on
bottom of tank.
expansion and contraction -
normal.
Air chambers in piping have
become waterlogged. Thermal
expansion tank damaged,
improperly charged, or
improperly sized.
Drain valve not closed tightly.
If leakage source cannot be
corrected or identified, call
qualified service agency.
Possible gas leaks.
user
Set thermostat dial to a higher
temperature
Call qualified service agency
Set thermostat dial to a higher
temperature
Call qualified service agency
Open main manual gas shutoff
valve to fullest extent.
Space usage to give heater time
to restore water temperature.
Call qualified service agency
Set thermostat to a lower setting.
Drain a quantity of water through
drain valve. If rumbling persists,
call a qualified service agency.
Drain piping system and refill.
Heater must be off while this
is being done. Check thermal
expansion tank charge pressure
when the water system pressure
is zero.
If drain valve cannot be closed
tightly, replace.
Shut off gas supply to heater
and close cold water inlet valve
to heater.
Shut off gas supply to heater
and call gas company at once
33
remedy
Qualified serViCe agenCy
Check continuity and resistance (Ohms)
of upper and lower temperature probes.
replace probes if out of specification.
Check continuity and resistance (Ohms)
of upper and lower temperature probes.
replace probes if out of specification.
Check gas input. If incorrect, check
for inlet air blockage and/or flue gas
exhaust blockage.
Delime heater.
Follow the manufacturer's instructions
for proper charging of the thermal
expansion tank.
repair or in case of suspected tank
leakage, be certain to confirm before
replacing heater.