White Rodgers 927, 922, 921, 37E73A-918 Troubleshooting, Error Indication Check, Repair, or Replace

Page 8

TROUBLESHOOTING

The troubleshooting charts cover the error codes that the Intelli-Vent™ control can recognize, the potential cause, and those actions that may help repair the problem. The water heater manufacturer’s troubleshooting procedure should be consulted before attempting to repair the appliance. The wa- ter heater manufacturer’s instructions take priority over the instructions here.

If for any reason you question your ability, or feel any doubt about your ability to perform any of the troubleshooting pro- cedures or repairs recommended. STOP! Contact a trained and qualified service professional to repair the water heater.

To troubleshoot the system using the error code indicators:

1.Check that the system is currently active and calling for a request for heat. You can initiate a call for heat by either drawing hot water from a nearby faucet or raising the tem-

perature setting (see section “Temperature Regulation”). If you have noted an error code from a previous heating cycle, this step is not necessary, and you may proceed with the next step.

2.Refer to the troubleshooting charts on below to find the error code that is displayed. Check and repair those items recommended.

3.Once the repair is complete, again initiate a call for heat, and observe that the ignition sequence complies with that shown on page 7.

4.After the water heater repair is complete, return the water heater temperature setting to the original temperature. If for any reason you cannot remember the original setting, return the setting to the 120oF setpoint. See the section “Temperature Regulation” for assistance in setting the wa- ter temperature setting.

 

 

 

Error

Indication

Check, Repair, or Replace

 

 

 

 

 

 

A

B

C

1

An open earth ground cir-

1. Check that the earth ground conductor is properly

cuit to the ignition system

connected at the fuse box or breaker panel and the

 

 

 

 

 

 

 

 

water heater.

 

 

 

 

 

2. Check that the grounding conductors on the water

 

 

 

 

 

heater are properly connected and secure.

 

 

 

 

 

 

A

B

C

2

The self diagnostic test

1. Check for proper connection of the line neutral and

 

 

 

detected a wiring error or

line hot wires.

 

 

 

 

a high resistance to earth

2. Check that the appliance is securely connected to

 

 

 

 

ground

earth ground.

 

 

 

 

 

 

A

B

C

3

The pressure switch re-

1. The pressure switch wiring is incorrect.

mained closed longer that

2. The pressure switch is defective and must be

 

 

 

 

 

 

 

5 seconds after the call for

replaced.

 

 

 

 

heat began.

 

 

 

 

 

 

 

A

B

C

4

The pressure switch re-

1. The pressure switch wiring is incorrect.

mained open longer than 5

2. The pressure switch tubing is not connected cor-

 

 

 

 

 

 

 

seconds after the combus-

rectly.

 

 

 

 

tion blower was energized

3. Obstructions or restrictions in the water heater air

 

 

 

 

 

 

 

 

 

 

intake or exhaust flue.

A

B

C

5

The self diagnostic test has

1. Check that all wiring is correct and secure.

detected an error in the Hot

2. Disconnect the ignitor and measure the ignitor re-

 

 

 

 

 

 

 

Surface Ignitor circuit.

sistance with an accurate ohmmeter between pins

 

 

 

 

 

 

 

 

1 and 2. Resistance should be between 11.5 and

 

 

 

 

 

 

 

 

18.8 ohms. If the reading is incorrect, replace the

 

 

 

 

 

 

 

 

Hot Surface Ignitor.

 

 

 

 

 

 

 

 

3. If the above checks are good, replace the INTELLI-

 

 

 

 

1

2

3

4

VENT™ control.

A

B

C

6

The maximum number of

1. Check if the gas supply is off or too low to operate.

ignition retries or recycle

2. Check that the flame sense rod to see that it is

 

 

 

 

 

 

 

has been reached and the

located properly and free from contamination.

 

 

 

 

system is in lockout

Reposition the flame sense rod or lightly clean with

 

 

 

 

 

an abrasive cloth.

 

 

 

 

 

3. The Hot Surface Ignitor may not be positioned cor-

 

 

 

 

 

rectly. Reposition as necessary.

 

 

 

 

 

4. The Hot Surface Ignitor and Flame Sense Rod

 

 

 

 

 

wired correctly and in good working condition.

 

 

 

 

 

Repair as required.

 

 

 

 

 

5. Low voltage to the water heater. Check and repair.

8

Page 7 Page 9
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Page 7 Page 9
Contents Description PrecautionsContents Specification InstallationInstalling the NEW Control Removing the OLD ControlPressure Regulator Adjustment Pressure port and regulator adjust locationsTemperature Regulation Temperature Settings Display ApproximateOperating Instructions Time to CauseShutting OFF the Appliance Vacation ShutdownIntelli-VentWiring Diagram Typical Installation Wiring DiagramSequence of Operations Intelli-Vent Sequence of OperationTroubleshooting Error Indication Check, Repair, or ReplaceTroubleshooting Page

922, 921, 37E73A-918, 927 specifications

The White Rodgers 37E73A series is a highly regarded line of thermostats known for their reliability and user-friendly interface. The specific models, including the 918, 922, 927, and 921, cater to a wide range of residential and commercial heating and cooling applications. These thermostats are designed to provide optimal temperature control while enhancing energy efficiency.

One of the main features of the White Rodgers 37E73A series is its digital display, which provides clear and intuitive access to temperature settings and programming options. The backlit display ensures readability in low-light conditions, making it convenient for users to adjust settings anytime.

The series supports both heating and cooling systems, making it versatile for various HVAC setups. Whether used in a furnace, heat pump, or air conditioning system, these thermostats can adapt to maintain the desired comfort level efficiently.

Another notable characteristic is its programmable capabilities. With the ability to set multiple temperature profiles throughout the day, users can save energy by lowering the temperature when they are away from home or sleeping. This feature not only contributes to reduced energy bills but also supports environmental sustainability by decreasing overall energy consumption.

The 37E73A series incorporates advanced technology designed for ease of installation and compatibility. The wiring system has been simplified, allowing for straightforward integration with existing HVAC systems. This ease of installation is complemented by detailed instructions that guide users through the setup process, ensuring a hassle-free experience.

Energy-saving features are also a key focus of the White Rodgers 37E73A thermostats. Many models include a built-in energy-saving mode that automatically adjusts settings during peak demand hours. This smart technology enhances the system's performance while maximizing efficiency, ultimately leading to cost savings over time.

In terms of design, the White Rodgers 37E73A thermostats boast a sleek and modern appearance that complements any home or office décor. The interfaces are designed with user comfort in mind, ensuring that adjustments can be made easily without technical expertise.

Overall, the White Rodgers 37E73A-918, 922, 927, and 921 models are exemplary choices for anyone looking to optimize temperature control in their living or working spaces. With their array of features, reliable technologies, and energy-efficient characteristics, these thermostats stand out in the HVAC market as a practical solution for climate management.
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