A.O. Smith W/HOT instruction manual D E F

Page 33

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

6

B C D E F

Ignition/flame failure.

1. Gas supply is turned off - pressure too low. Ensure

 

 

 

 

The water heater has reached the

supply and manifold gas pressures are within

 

 

 

 

 

requirements in the installation manual. Manifold gas

 

 

 

 

 

maximum number of retries and is

pressure is non-adjustable if pressure is off by more

 

 

 

 

 

currently locked out for one hour.

than 0.3” W.C. (75 Pa) replace the Intelli-Vent™ control.

 

 

 

 

 

Cycle the power to the water heater

2. Low supply voltage - should be 115 -125 VAC.

 

 

 

 

 

off and on to reset.

3. Ensure flame sensor is making good contact with the

 

 

 

 

 

Service Note:

 

 

 

 

 

burner flame, ensure flame is steady see #8 below.

 

 

 

 

 

The resistance (ohms) of a hot surface

4. Ensure the flame sensor is clean - use ultra fine steel

 

 

 

 

 

ignitor will increase over time. If the

 

 

 

 

 

resistance at room temperature is near

wool or Scotch-Brite™ pad to clean flame sensor.

 

 

 

 

 

18.8 ohms - consider replacing the ignitor

5. Ensure the hot surface ignitor is positioned to provide

 

 

 

 

 

as a preventative measure.

 

 

 

 

 

 

consistent ignition.

 

 

 

 

 

 

6. Check for any cracks in ignitor assembly ceramic

 

 

 

 

 

 

insulators - replace ignitor assembly if damaged.

 

 

 

 

 

 

7. Check resistance of ignitor at room temperature (77ºF)

 

 

 

 

 

 

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

 

 

 

 

 

 

not within 11.5 and 18.8 ohms at room temperature.

 

 

 

 

 

 

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

 

 

 

 

 

 

used per installation manual for vent length. Using larger

 

 

 

 

 

 

pipe than required may cause excessive air turbulance

 

 

 

 

 

 

in the combustion chamber.

 

 

 

 

 

 

 

 

B

C D

E

F

Self diagnostic tests have found a problem

1. Turn the power off for 10-20 seconds then on again to

 

 

 

 

 

7

 

 

 

 

with the gas valve driver circuit, internal

clear these error codes.

 

 

 

 

 

microprocessor, or other internal circuits.

2. If any of these error codes persist or cannot be cleared-

 

 

 

 

 

 

 

B

C D

E

F

 

replace the Intelli-Vent™ control.

 

 

 

8

B C D E F

9

 

B C D E F

Flame signal has been sensed out of

1. Turn the power off for 10-20 seconds and then on again

10

 

proper sequence.

again to clear this error code.

 

 

 

2. Replace the Intelli-Vent™ control if this error code persists.

 

 

 

 

 

B C D E F

Water temperature in the tank has

1. Turn the power off for 10-20 seconds then on again

11

 

exceeded 195°F (91°C) and has

to clear this error code.

 

 

activated the ECO.

2. Replace the Intelli-Vent™ if the error code persists.

 

 

 

 

 

 

 

 

B C D E F

The self diagnostic check detected one

1. Press and release temperature adjust buttons. If the

12

or both of the temperature adjust buttons

above action does not clear the error, the control will

 

 

 

are stuck.

continue to regulate water temperature at the last setting.

 

 

 

However, settings will no longer be adjustable - the

 

 

 

control should be replaced.

 

 

 

 

 

B C D E F

The self diagnostic test has detected the

1. Turn the power off for 10-20 seconds then on again

13

water temperature sensor (thermistor) is

to clear this error code.

 

 

 

either open or shorted.

2. Replace the Intelli-Vent™ control if this error code persist.

 

 

 

33

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Contents Commercial GAS Water Heaters Power Vented GAS Models W/HOT Surface IgnitionImportant Definitions Safe INSTALLATION, USE and ServiceGeneral Safety General Safety Introduction Table of ContentsTypical Installation Replacement Parts and Deliming ProductsRelief Valve Elbow Access Door Condensate Hose and Drain PAN ROUGH-IN-DIMENSIONS Rough-In-DimensionsCapacity and Gas and Electrical Characteristics Mixing Valve Usage Facts to Consider about the Location Locating the NEW Water HeaterInsulation Blankets ALL AIR from Outdoors See Figures 7, 8 ALL AIR from Inside Buildings SeeInstalling the NEW Water Heater Chemical Vapor CorrosionWater Piping Valve and Pipe Insulation if supplied TEMPERATURE-PRESSURE Relief ValveGAS Piping GAS Piping with Flexible ConnectorSediment Traps Vent Pipe AssemblyFilling the Water Heater VentingHorizontal Vent Clearances Canadian Horizontal Vent Clearances Vent Pipe TerminationVent Hoods MAY be Extremely HOT During Operation Condensate Planning the Vent SystemBlower Assembly Installation Installation of Vent SystemVent Terminal INSTALLATION, Sidewall Vent Termination Figure Power Vent Wiring Schematic FigureInstallation of Vertical Vent System Installation of Vent SYSTEM, SidewallVertical VAA Installations Recommended Vent Attenuation Assembly InstallationInch vent Horizontal VAA Installations Inch vent Vertical VAA InstallationsRecommended BRUSH* Size for Primer Cement Applications Vent Pipe PreparationStep E Step BStep F Step GBurner. Do not try to light the burner by hand Power Before ServicingWhat to do if YOU Smell GAS Do not TRY to Light the Burner by HandTemperature Indicators Temperature Adjustment Buttons Temperature RegulationDisplay D E FFor Your Information Start UP ConditionsOperational Conditions Burner Cleaning Periodic MaintenanceVenting System Inspection Burner Operation and InspectionTEMPERATURE-PRESSURE Relief Valve Operation Anode ROD InspectionDraining Leakage Checkpoints ServiceTrouble Shooting Troubleshooting GuidelinesD E F Troubleshooting Guidelines Claim Procedure Service and Repair ExpensesTank 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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