A.O. Smith W/HOT instruction manual Troubleshooting Guidelines, Trouble Shooting

Page 32

TROUBLESHOOTING GUIDELINES

WATER HEATER CONTROL

TROUBLE SHOOTING

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.

INTELLI-VENT TROUBLESHOOTING CHART - RESIDENTIAL CONTROL

#

LED STATUS

PROBLEM

SOLUTION

1

B

C D

E

F

Inadequate or no earth ground

1. Ensure the wall outlet is properly grounded.

 

 

 

 

sensed by the Intelli-Vent™

2. Ensure all ground connections/wires on the

 

 

 

 

 

control.

 

 

 

 

 

 

water heater are secure.

2

B

C D

E

F

Power supply to Intelli-Vent™

1. Ensure the wall outlet is properly wired.

 

 

 

 

control has reversed polarity or a

2. Ensure all internal 120 VAC wiring connections and

 

 

 

 

 

high resistance to earth ground.

 

 

 

 

 

 

wiring harness have no reversed wires. 120 VAC

 

 

 

 

 

 

“hot” wire must connect to the on/off switch.

 

 

 

 

 

 

3. Ensure the wall outlet is properly grounded.

 

 

 

 

 

 

4. Ensure all ground connections/wires on the water

 

 

 

 

 

 

heater are secure.

3

B C D E F

Pressure switch circuit remaining

1. Ensure air pressure switch circuit wiring is correct

 

 

 

 

closed for more than 5 seconds

and the air pressure switch is not jumpered.

 

 

 

 

 

after heating cycle begins.

2. Secure power to water heater, check continuity of air

 

 

 

 

 

Blower does not start.

 

 

 

 

 

Service Note:

pressure switch contacts with wires disconnected.

 

 

 

 

 

A If pressure switch contacts show continuity (closed

 

 

 

 

 

Disconnect power - disconnect one

 

 

 

 

 

wire from the air pressure switch

circuit) replace the pressure switch.

 

 

 

 

 

or the vent temperature limit

B If pressure switch contacts are open and all wiring

 

 

 

 

 

switch. Turn power back on -

 

 

 

 

 

blower should start.

is correct - turn the power off for 10-20 seconds

 

 

 

 

 

 

then on again to clear the error code - if the error

 

 

 

 

 

 

code persists replace the Intelli-Vent™ control.

 

 

 

 

 

 

 

4

B

C D

E

F

Pressure switch circuit remains open

1. Ensure the blower is running - check for 120 VAC to

 

 

 

 

longer than 5 seconds after the blower

the blower when the heating cycle begins, check the

 

 

 

 

 

is energized.

wiring. If the control does not energize the blower -

 

 

 

 

 

Blower may run continuously in

replace the Intelli-Vent™ control. If the blower fails to

 

 

 

 

 

start when energized - replace the blower assembly.

 

 

 

 

 

this condition.

2. Ensure the air pressure switch sensing tube is properly

 

 

 

 

 

 

 

 

 

 

 

 

connected - not kinked or damaged.

 

 

 

 

 

 

3. Check continuity of vent temperature limit switch - replace

 

 

 

 

 

 

switch if contacts remain open under 160ºF (71°C).

 

 

 

 

 

Service Note:

4. Ensure the correct size of vent pipe (2”, 3”, 4”) was used

 

 

 

 

 

per installation manual for vent length. Ensure maximum

 

 

 

 

 

To learn more about performing Air

number of elbows or equivalent feet of vent pipe has not

 

 

 

 

 

Pressure Switch tests visit our web

exceeded maximum limits.

 

 

 

 

 

site www.hotwater.com to download

5. Ensure there are no obstructions in the vent pipe.

 

 

 

 

 

technical bulletin A-023-06 Air Pressure

 

 

 

 

 

Switches.

6. Check air pressure switch performance - check pressure

 

 

 

 

 

 

 

 

 

 

 

 

with a digital manometer - check continuity of contacts.

 

 

 

 

 

 

(see service note in left column) If the switch proves

 

 

 

 

 

 

defective - replace the air pressure switch and or the

 

 

 

 

 

 

blower assembly as required.

 

 

 

 

 

 

7. If air pressure switch performance test results prove

 

 

 

 

 

 

the air pressure switch is working properly and error

 

 

 

 

 

 

code 4 persists - replace the Intelli-Vent™ control.

 

 

 

 

5

B C D E F

The Intelli-Vent™ control has detected

1. Check wiring to the hot surface ignitor - replace ignitor

 

 

 

 

an open ignitor circuit.

assembly if wiring is damaged or worn.

 

 

 

 

 

Service Note:

2. Check ignitor assembly plug and the socket on the

 

 

 

 

 

The resistance (ohms) of a hot surface

Intelli-Vent™ body for good connection. Replace

 

 

 

 

 

ignitor will increase over time. If the

ignitor assembly and/or control if necessary.

 

 

 

 

 

resistance at room temperature is near

3. Check resistance of ignitor at room temperature 77ºF

 

 

 

 

 

18.8 ohms - consider replacing the ignitor

 

 

 

 

 

as a preventative measure.

(25°C) at the plug end. Replace ignitor if resistance

 

 

 

 

 

 

is not within 11.5 and 18.8 ohms at room temperature.

 

 

 

 

 

 

4. If results from the above tests were good and error

 

 

 

 

 

 

code 5 persists - replace the Intelli-Vent™ control.

 

 

 

 

 

 

 

32

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Contents Power Vented GAS Models W/HOT Surface Ignition Commercial GAS Water HeatersSafe INSTALLATION, USE and Service Important DefinitionsGeneral Safety General Safety Table of Contents IntroductionRelief Valve Elbow Access Door Typical InstallationReplacement Parts and Deliming Products Condensate Hose and Drain PAN Capacity and Gas and Electrical Characteristics ROUGH-IN-DIMENSIONSRough-In-Dimensions Mixing Valve Usage Locating the NEW Water Heater Facts to Consider about the LocationInsulation Blankets ALL AIR from Inside Buildings See ALL AIR from Outdoors See Figures 7, 8Water Piping Installing the NEW Water HeaterChemical Vapor Corrosion TEMPERATURE-PRESSURE Relief Valve Valve and Pipe Insulation if suppliedGAS Piping with Flexible Connector GAS PipingVent Pipe Assembly Sediment TrapsFilling the Water Heater VentingVent Hoods MAY be Extremely HOT During Operation Horizontal Vent ClearancesCanadian Horizontal Vent Clearances Vent Pipe Termination Planning the Vent System CondensateVent Terminal INSTALLATION, Sidewall Blower Assembly InstallationInstallation of Vent System Power Vent Wiring Schematic Figure Vent Termination FigureInstallation of Vent SYSTEM, Sidewall Installation of Vertical Vent SystemVent Attenuation Assembly Installation Vertical VAA Installations RecommendedInch vent Vertical VAA Installations Inch vent Horizontal VAA InstallationsVent Pipe Preparation Recommended BRUSH* Size for Primer Cement ApplicationsStep B Step EStep F Step GPower Before Servicing Burner. Do not try to light the burner by handWhat to do if YOU Smell GAS Do not TRY to Light the Burner by HandTemperature Regulation Temperature Indicators Temperature Adjustment ButtonsDisplay D E FOperational Conditions For Your InformationStart UP Conditions Periodic Maintenance Burner CleaningVenting System Inspection Burner Operation and InspectionDraining TEMPERATURE-PRESSURE Relief Valve OperationAnode ROD Inspection Service Leakage CheckpointsTroubleshooting Guidelines Trouble ShootingD E F Troubleshooting Guidelines Service and Repair Expenses Claim ProcedureTank ALL Other Parts

W/HOT specifications

A.O. Smith, a leading manufacturer of water heating solutions, has made its mark in the industry with innovative products that combine efficiency, reliability, and advanced technology. Among its standout offerings is the A.O. Smith W/HOT series, designed to meet the diverse needs of residential and commercial customers.

The W/HOT series showcases a variety of tankless water heaters characterized by their ability to provide endless hot water on demand. Unlike traditional tank water heaters, which can run out of hot water during heavy usage, the W/HOT series ensures a constant supply, making it an ideal choice for families and businesses with high hot water needs. This feature not only enhances convenience but also optimizes energy usage by eliminating the standby heat loss associated with storage tanks.

One of the key technologies integrated into the W/HOT series is the microprocessor control system. This intelligent technology allows the unit to monitor water usage patterns and adjust operation accordingly. By optimizing heating cycles based on actual demand, this feature helps improve energy efficiency, resulting in lower utility bills without compromising performance.

The W/HOT series also incorporates advanced heat exchanger technology, enabling rapid heating of water as it passes through the system. This means minimal wait time for hot water and reduced energy consumption, as the unit only heats water when it is needed. The heat exchangers are designed for durability and effective heat transfer, helping to extend the overall lifespan of the unit.

Safety is a top priority in the design of A.O. Smith water heaters. The W/HOT series is equipped with multiple safety features, including a built-in thermal shut-off switch and safety sensors that prevent overheating. Additionally, the units are designed to comply with industry standards and regulations, ensuring peace of mind for users.

Installation flexibility is another defining characteristic of the W/HOT series. These tankless water heaters can be installed in various locations, requiring minimal space compared to traditional units. Their compact design makes them suitable for tight spaces, such as closets or utility rooms.

Overall, the A.O. Smith W/HOT series represents a commitment to innovation and quality in water heating solutions. Its combination of tankless design, advanced technology, and safety features makes it an excellent choice for those seeking efficient and reliable hot water access. Whether for residential or commercial use, A.O. Smith continues to lead the way in delivering top-tier water heating solutions that meet the evolving needs of consumers.
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