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complaint
Water not hot enough.
Insufficient hot water
Water temperature too hot.
Heater makes sounds: sizzling.
rumbling.
Ticking or metallic sounds.
Pounding / water hammer.
Combustion noises.
Water leaks.
Gas odors.
troubleshooting checklist
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.
Condensation on outside of
tank - normal.
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.
Too much primary air.
Overtired heater. Incorrect
burners or orifice for types of
gas used.
Drain valve not closed tightly.
If leakage source cannot be
corrected or identified, call
qualified service agency.
Heater is over fired.
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.
Call qualified service agency.
Call qualified service agency.
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 qualified service agency.
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
thermostat probes. replace probes
if out of specification.
Check continuity and resistance
(Ohms) of upper and lower
thermostat probes. replace probes
if out of specification..
Check gas input. If incorrect, adjust
gas pressure or replace main burner
orifice.
Delime heater.
Follow the manufacturer's
instructions for proper charging
of the thermal expansion tank.
Check and correct as necessary.
repair or in case of suspected tank
leakage, be certain to confirm before
replacing heater.
Check for sooted flue passage.
Check for obstructed vent line.
Check backdraft or lack of draft.
Draft hood may be improperly
installed or not sized properly.
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