TROUBLESHOOTING GUIDELINES

These guidelines should be utilized by a qualified service agent.

Problem

 

 

Cause

Solution

 

 

 

 

 

 

 

Improperly sealed, hot or cold supply connection,

Tighten threaded connections.

WATER LEAKS

 

 

relief valve, drain valve, or thermostat threads.

 

 

 

 

Leakage from other appliances or water lines.

Inspect other appliances near water heater.

 

 

 

 

 

 

Condensation of flue products.

Refer to CONDENSATION.

 

 

 

Thermal expansion in closed water system.

Install thermal expansion tank (DO NOT plug T&P valve).

LEAKING T&P VALVE

 

 

Improperly seated valve.

Check relief valve for proper operation

 

 

 

 

(DO NOT plug T&P valve).

HOT WATER 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.

 

 

 

 

 

 

Dirty pilot burner.

Clean pilot assembly.

PILOT OUTAGE

 

 

Thermocouple tip is not in contact with pilot flame.

Insert thermocouple correctly.

 

 

 

Thermocouple malfunction.

Replace thermocouple.

 

 

 

Thermocouple malfunction.

Check thermostat.

 

 

 

Gas knob dial not positioned correctly.

Refer to LIGHTING INSTRUCTIONS.

PILOT WILL NOT LIGHT

 

 

Pilot orifice clogged.

Clean or replace pilot orifice.

 

 

 

Pinched or clogged pilot tube.

Replace pilot tube.

 

 

 

Main gas supply off.

Turn on main gas shut-off valve.

 

 

 

Heater not lit or thermostat not on.

Refer to LIGHTING INSTRUCTIONS.

 

 

 

Thermostat set too low.

Refer to TEMPERATURE REGULATION.

NOT ENOUGH OR

 

 

Heater undersized.

Reduce the hot water use.

NO HOT WATER

 

 

Low gas pressure.

Contact dealer.

 

 

 

Incoming water is unusually cold.

Allow more time for heater to re-heat.

 

 

 

Leaking hot water pipes or fixtures.

Have a 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 HIGH TEMPERATURE REGULATION.

WATER HEATER SOUNDS:

 

 

Condensate dripping on burner.

Refer to CONDENSATE.

 

 

Sediment at bottom of heater tank.

Clean sediment from tank. Refer to DRAINING instructions

SIZZLING - RUMBLING

 

 

 

 

 

in Maintenance section of manual.

 

 

 

 

SOOTING

 

 

Improper combustion.

Refer to FACTS TO CONSIDER ABOUT THE LOCATION.

 

 

 

Also see Figure 2 on page 6.

 

 

 

 

 

 

 

 

 

 

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A.O. Smith FMD 30, FMD 40, FMD 50, 315795-000 MH instruction manual Troubleshooting Guidelines

FMD 40, FMD 50, 315795-000 MH, FMD 30 specifications

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