TROUBLE SHOOTING

Water heater may exhibit problems that are unrelated to a malfunction of the water heater itself. The following information and tables may serve to answer your question about a problem that you are having without having to call a service agent.

WARNING: DO NOT BY-PASS ANY CONTROLS TO MAKE HEATER OPERATE. OPERATE ONLYAS WIRED FROM FACTORY.

TROUBLE SHOOTING GUIDE

Please check guidelines below. For your safety, water heater service should be performed only by a qualified service technician. Read the GENERAL SAFETY INFORMATION section first.

WATER HEATER CONTROL

LED STATUS

PROBLEM

 

SOLUTION

 

An open earth ground circuit to the

1.

Check that the earth ground connection is

A B C

ignition system.

 

properly connected.

 

 

2.

Check that the ground conductor on the

 

 

 

water heater is properly connected.

A B C

Wiring error or a high resistance to

1.

Check for proper connection of line

earth ground.

 

neutral and hot wires.

 

 

 

 

2.

Check that the water heater is securely

 

 

 

connected to earth ground.

A B C

Pressure switch remained closed longer

1.

Pressure switch wiring is incorrect.

than 5 seconds after the call for

2.

Replace pressure switch.

 

 

heat began.

 

 

A B C

Pressure switch remained open longer

1.

Pressure switch wiring is incorrect.

than 5 seconds after the combustion

2.

Pressure switch tubing not connected

 

 

blower was energized.

 

correctly.

 

 

3.

Air intake or exhaust obstructed.

A B C

Error in the hot surface ignitor circuit.

1.

Check that all wiring is correct and secure.

 

 

2.

Replace hot surface ignitor.

 

System in lockout.

1.

Gas supply is off or too low to operate.

A B C

 

2.

Hot surface ignitor not positioned

 

 

correctly.

 

 

 

 

 

3.

Low voltage to the water heater.

 

 

4.

Electric polarity to unit is incorrect - test

 

 

 

and correct.

A B C

Problem in the gas valve driver circuit.

1.

Turn power to the water heater off for

 

 

 

10 seconds and then back on.

 

 

2.

Replace gas control valve.

A B C

Problem with the internal circuit.

1.

Turn power to the water heater off for

 

 

10 seconds and then back on.

 

 

 

 

 

2.

Replace gas control valve.

A B C

Problem with the internal circuit.

1.

Turn power to the water heater off for

 

 

 

10 seconds and then back on.

 

 

2.

Replace gas control valve.

A B C

Flame signal sensed out of

1.

Replace gas control valve.

 

proper sequence.

 

 

A B C

ECO activated.

1.

Replace gas control valve.

 

A B C

One of the temperature adjust

1.

Press and release each of the buttons once.

 

buttons stuck closed.

2.

Replace gas control valve.

A B C

Water temperature sensor is

1.

Check that all wiring is correct and secure.

 

either open or short circuited.

2.

Replace gas control valve.

18

Page 17 Page 19
Page 18
Image 18
A.O. Smith FPSH - 75 owner manual Trouble Shooting Guide, Water Heater Control LED Status Problem Solution
Page 17 Page 19

FPSH - 75 specifications

The A.O. Smith FPSH-75 is a prominent model in the lineup of water heaters offered by A.O. Smith, a company renowned for its innovative approach to water heating solutions. This residential water heater is designed to meet the demands for both efficiency and performance, making it a popular choice for households seeking reliable hot water supply.

One of the standout features of the FPSH-75 is its impressive 75-gallon capacity, which is suitable for larger households or properties that require high volumes of hot water. This feature ensures that multiple fixtures can be used simultaneously without the worry of running out of hot water. Additionally, the unit is equipped with a powerful heating element that provides rapid heating, making it efficient for quick recovery times even during peak usage.

The FPSH-75 utilizes advanced insulation technology to minimize heat loss, which enhances energy efficiency. This means that the water heater can maintain the desired water temperature while consuming less energy. As a result, homeowners can enjoy significant savings on their energy bills, all while benefiting from consistent hot water availability.

This model is also designed with user-friendly controls, allowing homeowners to set and adjust their water temperature preferences easily. The intuitive interface ensures that users can operate the unit without hassle, optimizing their water heating experience.

Safety is also a critical consideration in the design of the FPSH-75. It comes with built-in safety features, including a temperature and pressure relief valve, which helps prevent potential hazards associated with overheating and excessive pressure buildup. Moreover, the durable construction of the tank is engineered to withstand corrosion, extending the lifespan of the water heater.

Installation is made convenient with the FPSH-75, as it is compatible with various plumbing setups, making it adaptable for a range of home designs. The model has been certified for meeting the industry standards, ensuring reliability and peace of mind for end-users.

In summary, the A.O. Smith FPSH-75 is an exceptional water heating solution, ideal for families and homes needing robust hot water delivery. Its combination of high capacity, energy efficiency, user-friendly controls, and safety features make it a top contender among residential water heaters, ensuring that homeowners can enjoy comfort and convenience without compromise.
Top Page Image Contents