Manuals / A.O. Smith / Household Appliance / Water Heater

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

Models: FMD 40 FMD 50 315795-000 MH FMD 30

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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
Page 25 Page 27

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

A.O. Smith is a renowned brand in the field of water heating solutions, offering a range of efficient and durable water heaters tailored to meet diverse consumer needs. Among its extensive lineup, the A.O. Smith FMD series showcases several commendable models, including the FMD 30, FMD 40, and FMD 50, each boasting unique features and advanced technologies.

The A.O. Smith FMD 30 is a compact water heater designed for smaller households or limited spaces. With a 30-gallon capacity, it is engineered to provide ample hot water for everyday needs such as bathing, washing dishes, and laundry. The heater employs advanced insulation technology, ensuring heat retention and energy efficiency. The thermostatic control system allows users to easily adjust the water temperature to their preference, ensuring comfort while promoting safety.

Moving to the A.O. Smith FMD 40, this model offers an increased capacity of 40 gallons, making it an ideal choice for medium-sized families. It incorporates A.O. Smith’s cutting-edge Durapower glass coating, which protects the tank from corrosion, ultimately extending its lifespan. The FMD 40 also features an enhanced heating element design that ensures rapid heating and consistent water temperature, making it perfect for bustling households.

The A.O. Smith FMD 50 takes things a step further, providing 50 gallons of hot water storage and designed for larger families or high-demand applications. This model integrates advanced technology features like a smart thermal control system that optimizes energy usage, ensuring that hot water is available when you need it without unnecessary power consumption. With robust construction materials, the FMD 50 is built to last, even in harsh conditions.

All models in the A.O. Smith FMD series prioritize user convenience. They come equipped with easy-to-read digital displays for monitoring temperature and status, along with built-in safety features such as automatic shut-off mechanisms. Installation is straightforward, and each unit adheres to energy efficiency standards, which help reduce utility bills while being environmentally friendly.

In summary, the A.O. Smith FMD series, including the FMD 30, FMD 40, and FMD 50, represents a commitment to quality and innovation. With their varying capacities and advanced technologies, these water heaters cater to a wide range of household needs, delivering reliable hot water solutions while maintaining energy efficiency and durability. Investing in an A.O. Smith FMD water heater not only guarantees comfort but also highlights a commitment to sustainability.