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A.O. Smith FMV-50 Benutzerhandbuch

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trouBleshootInG GuIdelInes
These guidelines should be utilized by a qualified service agent. When calling for service notify the service agent that this is a 
“Flammable Vapor Ignition Resistant” Product.
Problem
Cause
Solution
water leaKs
Improperly sealed, hot or cold supply connection, relief valve, 
drain valve, or thermostat threads.
Tighten threaded connections.
Leakage from other appliances or water lines.
Inspect other appliances near water heater.
Condensation of flue products.
Refer to CONDENSATE.
leaKInG t&p valve
Thermal expansion in closed water system.
Install  thermal  expansion  tank  (DO  NOT  plug  T&P 
valve).
Improperly seated valves.
Check relief valve for proper operation (DO NOT plug 
T&P valve.
sMellY odors
High sulfate or mineral content in water supply.
Drain and flush heater thoroughly, then refill.
Bacteria in water supply.
Chlorinate or aerate water supply.
pIlot wIll not lIGht
Gas control knob not positioned correctly.
Refer to LIGHTING INSTRUCTIONS.
Main gas supply off.
Turn on main gas Shut-off valve.
Igniter tip more than 1/8” from pilot hood.
Adjust ignitor tip.
Thermocouple malfunction.
Replace pilot assembly.
Thermocouple TCO malfunction.
Replace pilot assembly.
Melted insulation on ignitor wire or shorting of ignitor wire.
Contact a service agency to determine cause.
High ambient room temperature.
Contact a service agency to determine cause.
Wire disconnected from spark ignitor.
Reconnect wire connector to spark ignitor.
Broken electrode or electrical wire.
Replace pilot assembly.
Piezo ignitor generator fails to operate or malfunctions.
Replace Piezo ignitor generator.
Burner wIll not staY lIt
Thermocouple TCO malfunction.
Replace pilot assembly.
High ambient room temperature.
Contact a service agency to determine cause.
Dirty or clogged air intake screen.
Clean and reinstall air intake screen.
Flame arrestor openings blocked.
Contact a service agency to determine cause.
Defective Gas Control.
Replace gas control.
pIlot outaGe
Dirty pilot burner.
Clean pilot assembly.
Dirty or clogged air intake screen.
Clean and reinstall air intake screen.
Thermocouple tip is not in contact with pilot flame.
Insert thermocouple correctly.
Thermocouple malfunction.
Replace pilot assembly.
Thermocouple TCO malfunction.
Replace pilot assembly.
Defective Gas control.
Replace Gas Control.
not enouGh hot water
Heater not lit or thermostat not on.
Refer to LIGHTING INSTRUCTIONS.
Thermostat set too low.
Refer to TEMPERATURE REGULATION.
Heater undersized.
Reduce hot water use.
Low gas pressure.
Contact your gas supplier.
Incoming water is unusually cold.
Allow more time for heater to re-heat.
Leaking hot water pipes or fixtures.
Have plumber check and repair leaks.
High temperature limit switch activated.
Contact a service agency to determine cause.
water too hot
Thermostat set too high.
Refer to TEMPERATURE REGULATION.
water heater sounds
Condensation dripping on burner.
Refer to CONDENSATE above.
sIZZlInG-ruMBlInG
Sediment or calcium in bottom of heater tank.
Clean  sediment  from  tank.  Refer  to  DRAINING 
instructions in Maintenance  section of manual.
sootInG
Improper combustion.
No  adjustment  available.  Immediately  shut  down  the 
water heater and contact a service agency to determine 
cause.
vent Gas odors
Lack of supply air.
Immediately shut down the water heater and  contact a 
service agency to determine cause.
Improperly installed vent piping.
Downdraft.
Poor combustion.