TROUBLESHOOTING CHART

PROBLEM

 

POSSIBLE CAUSE(S)

 

CORRECTIVE ACTION

NO HOT WATER

1.

Hot water usage pattern exceeds the

1.

Change to different mode or modify usage

 

 

capability of the water heater in

 

patterns

 

2.

current mode

2.

Check for blown fuse or tripped breaker.

 

No power to the water heater

 

3.

Unit in standby

3.

Restore power to unit then press power button.

 

Press the power button to turn the unit on

 

4.

Unit in Vacation mode

4.

Select mode other than Vacation

 

5.

High temperature limit switch open

5.

Reset the high temperature limit switch; see

 

6.

Non-functioning upper temperature

6.

“Safety shut-off” section for more information

 

Contact a qualified person for service

 

 

sensor

 

 

INSUFFICIENT HOT WATER/

1.

Temperature set-point too low

1.

Increase set point temperature; see “Adjusting

SLOW HOT WATER

2.

Air filter dirty

 

the User Interface Module” section

RECOVERY

2.

Clean air filter

 

3.

Hot water usage pattern exceeds the

3.

Change to different mode or modify usage

 

 

capability of the water heater in

 

patterns (For example if in Efficiency Mode

 

4.

current mode

4.

switch to Hybrid Mode)

 

Water connections to unit reversed

Ensure the cold connection is at the bottom

 

5.

Heat lost through long run of exposed

5.

and that the hot connection is at the top

 

Insulate exposed piping

 

6.

pipe

6.

Repair hot water leaks

 

Hot water leak at faucet or piping

 

7.

Non-functioning heating element

7.

Call qualified person for service

 

8.

Sediment or scale build up in tank

8.

Drain and flush tank. Water conditioning may

 

 

 

 

be necessary to minimize build up

HIGH OPERATION COSTS

1.

Temperature set-point too high

1.

Decrease set point temperature; see “Adjusting

 

2.

Air filter dirty

2.

the User Interface Module”

 

Clean air filter

 

3.

Electric mode selected

3.

Change to Efficiency or Hybrid mode for re-

 

4.

Water connections to unit reversed

4.

duced energy costs

 

Ensure the cold connection is at the bottom

 

5.

Heat lost thru long run of exposed

5.

and that the hot connection is at the top

 

Insulate exposed piping

 

6.

pipe

6.

Repair hot water leaks

 

Hot water leak at faucet or piping

 

7.

Sediment or scale build up in tank

7.

Drain and flush tank. Water conditioning may

 

 

 

 

be required to minimze build up

DRIP FROM TEMPERATURE &

1.

Excessive water pressure

1.

Check water supply inlet pressure. If higher

PRESSURE RELIEF VALVE

 

 

 

than 80 PSIG, install a pressure reducing

(Warning: Do not plug or cap

 

 

 

valve

T&P discharge pipe.)

2.

Add or service a thermal expansion

2.

See “Closed System/Thermal Expansion” section

 

3.

tank.

3.

Replace the Temperature & PressureRelief

 

Non-functioning Temperature &

 

 

Pressure Relief Valve

 

Valve

OTHER

1.

The water heater does not

1.

When first started the water heater takes about 8

 

2.

immediately start

2.

minutes to complete a diagnostic routine

 

The heat pump does not run in

Contact a qualified person for service

 

3.

Efficiency mode.

3.

Contact a qualified person for service

 

The heat pump runs when set to

 

 

Electric mode.

 

 

17

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A.O. Smith 318257-000, PHPT-80 installation instructions Troubleshooting Chart, Problem Possible Causes
Page 16 Page 18

318257-000, PHPT-80 specifications

The A.O. Smith PHPT-80,318257-000 is a highly efficient water heater designed to meet the needs of both residential and commercial applications. This unit features a capacity of 80 gallons, making it suitable for larger households and businesses requiring a significant supply of hot water. The PHPT-80 stands out for its innovative technologies, versatility, and durability.

One of the key features of the PHPT-80 is its high energy efficiency. This model utilizes advanced insulation technology that minimizes heat loss, making it an excellent choice for energy-conscious consumers. In addition, the heater is equipped with a powerful and efficient heating element that ensures rapid recovery times, allowing for a continuous supply of hot water even during peak usage periods.

The PHPT-80 also incorporates a user-friendly digital display that provides real-time information about the unit's performance. This feature enables users to monitor water temperature settings, energy usage, and maintenance alerts, enhancing convenience and ensuring optimal operation. Furthermore, the heater includes a self-diagnostic system that assists in troubleshooting and ensures that the system runs smoothly.

Safety is another critical aspect of the design of the A.O. Smith PHPT-80. It includes a comprehensive set of safety features such as a temperature and pressure relief valve, an over-temperature protection system, and a flame arrestor. These features help minimize the risk of accidents and ensure peace of mind for users.

Constructed with high-quality materials, the PHPT-80 boasts durability and longevity. Its tank is lined with a corrosion-resistant coating and insulated to protect against external elements and prolong its lifespan. Additionally, it features a robust commercial-grade thermostat that allows for precise temperature control.

A.O. Smith's commitment to sustainability is also reflected in the PHPT-80. The unit is designed to be eco-friendly, contributing to lower utility bills and reduced environmental impact. The heater complies with stringent industry standards, making it a responsible choice for consumers looking to reduce their carbon footprint.

With its blend of energy efficiency, advanced technology, user-friendly features, and robust safety mechanisms, the A.O. Smith PHPT-80,318257-000 water heater represents a reliable solution for those in need of a high-capacity hot water supply. Whether for residential or commercial use, this model delivers exceptional performance and reliability, making it a top choice among water heater options.
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