26
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 be examined
before using the checklist. Be sure to refer to the correct piping and wiring diagram for the type of system that is installed.
The system should be filled with water, purged of air, valves properly set and utilities connected and ready to operate.
REMEDY
COMPLAINT
CAUSE
USER
SERVICEMAN
*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 higher
*See WATER TEMPERATURE
temperature.
CONTROL WARNING (on
Page 20).
Thermostat out of calibration.
Call serviceman.
Recalibrate thermostat. If thermostat cannot
be recalibrated, replace.
Main manual gas shutoff
Open main manual gas shutoff
valve partially closed.
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 differential is
too wide.
greater than 4°F.
Heater recovery is slower.
Call serviceman.
Check gas input. If incorrect, adjust gas
pressure or replace main burner orifice.
Drafthood not installed or
Call serviceman.
Install drafthood or baffles as furnished
one or more flue baffles.
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 through
Delime heater.
bottom of tank.
drain valve. If rumbling persists,
call a serviceman.
Ticking or metallic sounds.
Expansion and contraction-
normal.
Pounding.
Air chambers in piping have
Drain piping system and refill.
become waterlogged.
Heater must be off while this is
being done.
Combustion noises.
Too much primary air.
Adjust shutters.
Overfired heater; Incorrect
Call serviceman.
Check and correct as necessary.
burners or orifice for type
of gas used.
Water leaks.
Drain valve not closed
If drain valve cannot be closed
tightly.
tightly, replace.
If leakage source cannot
Shut off gas supply to heater
Repair or in case of suspected tank leakage,
be corrected or identified,
and close cold water inlet valve
be certain to confirm before replacing heater.
call serviceman.
to heater.
Gas odors.
Heater is overfired.
Shut off gas supply to heater
Check for sooted flue passage.
and call a serviceman.
Check for obstructed vent line.
Check backdraft or lack of draft.
Possible gas leaks.
Shut off gas supply to heater and
call gas company at once.
