OPERATIONAL CHECKLIST
This checklist in conjunction with “TROUBLESHOOTING” and the “SEQUENCE OF OPERATION” should be used as an
The system should be filled with water, purged of air, valves properly set and utilities connected and ready to operate.
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COMPLAINT | CAUSE | USER | SERVICEMAN |
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*Water not hot enough. | Thermostat set too low. | Set thermostat dial to a higher |
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| temperature. |
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| Thermostat out of calibration. | Call serviceman | Recalibrate thermostat. If thermostat cannot |
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| be recalibrated, replace. |
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*Insufficient hot water | Thermostat set too low. | Set thermostat dial to a higher |
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*See WATER TEMPERATURE |
| temperature. |
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CONTROL WARNING (on |
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Page 20). | Thermostat out of calibration. | Call serviceman. | Recalibrate thermostat. If thermostat cannot |
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| be recalibrated, replace. |
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| Main manual gas shutoff | Open main manual gas shutoff |
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| valve partially closed. | valve to fullest extent. |
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| Heater too small for demand. | Space usage to give heater time |
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| to restore water temperature. |
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| Thermostat differential is | Call serviceman. | Replace dual bulb controller if differential is |
| too wide. |
| greater than 4°F. |
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| Heater recovery is slower. | Call serviceman. | Check gas input. If incorrect, adjust gas |
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| pressure or replace main burner orifice. |
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| Drafthood not installed or | Call serviceman. | Install drafthood or baffles as furnished |
| one or more flue baffles. |
| with unit. |
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Water temperature too hot. | Thermostat set too high. | Set thermostat to a lower setting. |
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Heater makes sounds: sizzling. | Condensation on outside |
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| of tank, normal. |
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Rumbling. | Sediment accumulation on | Drain a quantity of water through | Delime heater. |
| bottom of tank. | drain valve. If rumbling persists, |
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| call a serviceman. |
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Ticking or metallic sounds. | Expansion and contraction- |
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| normal. |
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Pounding. | Air chambers in piping have | Drain piping system and refill. |
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| become waterlogged. | Heater must be off while this is |
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| being done. |
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Combustion noises. | Too much primary air. | Adjust shutters. |
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| Overfired heater; Incorrect | Call serviceman. | Check and correct as necessary. |
| burners or orifice for type |
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| of gas used. |
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Water leaks. | Drain valve not closed | If drain valve cannot be closed |
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| tightly. | tightly, replace. |
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| 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. |
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Gas odors. | Heater is overfired. | Shut off gas supply to heater | Check for sooted flue passage. |
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| and call a serviceman. |
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| Check for obstructed vent line. |
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| Check backdraft or lack of draft. |
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| Possible gas leaks. | Shut off gas supply to heater and |
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| call gas company at once. |
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