34
OPERATIONAL CHECKLIST
This checklist in conjunction with “TROUBLESHOOTING” and the “SEQUENCE OF OPERATION” should be used as an on-the-job
troubleshooting guide to identify the cause of incorrect system operation and suggest a remedy for its correction. Because
improper piping and wiring can result in unsatisfactory system performance, it is suggested that the installation by examined
before using the checklist. Be sure to refer to the correct piping and wiring diagram for the type of system that is installed.
REMEDY
COMPLAINT
CAUSE
USER
SERVICE MAN
*Water not hot enough.
Thermostat set too low.
Set thermostat dial to
a higher temperature.
Thermostat out of calibration. Call serviceman.
Recalibrate thermostat.
If thermostat cannot be
recalibrated, replace.
*Insufficient hot water
Thermostat set too low.
Set thermostat dial to a
*See WATER TEMPERATURE
higher temperature.
WARNING (on page 27)
Thermostat out of calibration. Call serviceman.
Recalibrate thermostat. If
thermostat cannot be recalibrated,
replace.
Main manual gas shutoff
Open main manual gas
valve partially closed.
shutoff valve to fullest extent.
Heater too small for demand. Space usage to give heater
time to restore water
temperature.
Thermostat differential is
Call serviceman.
Replace dual bulb controller if
too wide.
differential is greater than 4°F.
Heater recovery is slower.
Call serviceman.
Check gas input. If incorrect,
adjust gas pressure or replace
main burner orifice.
Draft hood not installed or
Call serviceman.
Install draft hood or baffles as
one or more flue baffles.
furnished with unit.
Water temperature too hot.
Thermostat set too high.
Set thermostat to a
lower setting.
Heater makes sounds: sizzling.
Condensation on outside of
tank - normal.
Rumbling.
Sediment accumulation on
Drain a quantity of water
bottom of tank.
through drain valve. If
Delime heater.
rumbling persists, call
a serviceman.
Ticking or metallic sounds.
Expansion and contraction-
normal.
Pounding.
Air chambers in piping have
Drain piping system and
become waterlogged.
refill. Heater must be off
while this is being done.
Combustion noises.
Too much primary air.
Adjust shutters.
Overfired heater. Incorrect
burners or orifice for types
Call serviceman.
Check and correct as necessary.
of gas used.
Water leaks.
Drain valve not closed tightly. If drain valve cannot be
closed tightly, replace.
If leakage source cannot be
Shut off gas supply to heater Repair or in case of suspected
corrected or identified, call
and close cold water inlet
tank leakage, be certain to confirm
serviceman.
valve to heater.
before replacing heater.
Gas odors.
Heater is overfired.
Shut off gas supply to
Check for sooted flue passage.
heater and call serviceman. Check for obstructed vent line.
Check backdraft or lack of draft.
Draft hood may be improperly
installed or not sized properly.
Possible gas leaks.
Shut off gas supply to
heater and call gas
company at once.
