Lochinvar LTN07575 Instruction Manual page 36

Symptom
Improperly sealed, hot or cold supply connection, relief
valve, drain valve, or thermostat threads.
WATER LEAKS
Leakage from other appliances or water lines.
Condensation of flue products.
Thermal expansion in closed water system.
LEAKING T&P VALVE
Improperly seated valve.
High sulfate or mineral content in water supply.
SMELLY WATER
Bacteria in water supply.
Gas control knob not positioned correctly.
Main gas supply off.
PILOT WILL NOT LIGHT
Thermopile malfunction.
No spark.
Thermopile malfunction.
BURNER WILL NOT STAY
LIT
Defective Gas Control.
Dirty pilot burner.
Thermopile malfunction.
PILOT OUTAGE
Defective Gas Control.
Thermopile tip is not in contact with pilot flame.
Heater not lit or thermostat not on.
Thermostat set too low.
Heater undersized.
NOT ENOUGH HOT
Low gas pressure.
WATER
Incoming water is unusually cold.
Leaking hot water pipes or fixtures.
High temperature limit switch activated.
WATER TOO HOT Thermostat set too high.
WATER HEATER
Condensation dripping on burner.
SOUNDS
SIZZLING OR RUMBLING Sediment or calcium in bottom of heater tank.
SOOTING Improper combustion.
Lack of supply air.
Improperly installed vent piping.
VENT GAS ODORS
Downdraft.
Poor combustion.
TABLE 6. GENERAL TROUBLESHOOTING GUIDELINES
These guidelines should be used by a qualified service agent.
Problem
Tighten threaded connections.
Inspect other appliances near water heater.
See Condensation (page 25).
Install thermal expansion tank (DO NOT plug T&P valve).
Check relief valve for proper operation (DO NOT plug T&P
valve).
Drain and flush heater thoroughly, then refill.
Chlorinate or aerate water supply.
See the Lighting Instructions on the water heater's label.
Turn on main gas shutoff valve.
Replace pilot/thermopile assembly.
Locate piezo switch on thermostat. Replace if needed.
Replace pilot/thermopile assembly.
Replace Gas Control.
Clean pilot assembly.
Replace pilot/thermopile assembly.
Replace Gas Control.
Insert thermopile correctly.
See Lighting Instructions on the water heater's label.
See Temperature Regulation (page 24).
Reduce hot water use.
Contact your gas supplier.
Allow more time for heater to re-heat.
Have plumber check and repair leaks.
Contact a service agency to determine cause.
See Temperature Regulation (page 24).
See Condensation (page 25).
Drain and flush the water heater. See Draining and
Flushing (page 30).
No adjustment available. Contact a service agency to
determine cause.
Contact a service agency to determine cause.
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Corrective Action