A.O. Smith BTX-80 SERIES 100 instruction manual Troubleshooting Guidelines, Trouble Shooting

Page 35

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 - USER 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.

 

 

 

 

 

 

 

 

B

C D

E

F

The Intelli-Vent™ control has detected

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

5

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.

 

 

 

 

 

 

 

35

Page 34 Page 36
Image 35
Page 34 Page 36
Contents 197086-004 Power Vented GAS Models W/HOT Surface IgnitionWhenever maintenance adjustment or service is required PrintedImportant Definitions Safe INSTALLATION, USE and ServiceApprovals General Safety Information General Safety Information Introduction Table of ContentsExemptions Installation of Carbon Monoxide DetectorsApproved Carbon Monoxide Detectors SignageElbow Access Door Typical InstallationReplacement Parts and Deliming Products Condensate Hose and Drain PAN Mixing Valves Recovery capacity based on 90% thermal efficiency ROUGH-IN-DIMENSIONSRough-In-Dimensions Capacity and Gas and Electrical CharacteristicsFacts to Consider About the Location Locating the NEW Water HeaterAir REQUIREMENTs Insulation BlanketsOutdoor Air Through Two Openings Unconfined SpaceConfined Space Fresh Air Openings For Confined SpacesAIR from Other Indoor Spaces Outdoor AIR Through TWO Horizontal DuctsOutdoor AIR Through TWO Vertical Ducts Space Heating and Potable Water System Installing the NEW Water HeaterChemical Vapor Corrosion Water PipingValve and Pipe Insulation if supplied Temperature-Pressure Relief ValveThermal Expansion Gas Piping High Altitude InstallationContact qualified installer or service agency Per square inch 3.5 kPa Sediment TrapsFilling the Water Heater Venting Vent Pipe AssemblyVent Pipe Termination Termination Clearances Sidewall Power VentBreathing Hazard Carbon Monoxide Gas Planning the Vent SystemCondensate Vent Terminal INSTALLATION, Sidewall Blower Assembly InstallationInstallation of Vent System Pointed in the correct position, see Figure Power Vent Wiring Schematic FigureChisel an opening approximately one half inch 1.3 cm larger Than the marked circleInstallation of Vertical Vent System Installation of Vent SYSTEM, SidewallVertical VAA Installations Recommended Vent Attenuation Assembly InstallationVent attenuation assembly Flexible tubing Instruction sheet Inch vent Vertical VAA Installations Recommended BRUSH* Size for Primer Cement Applications Vent Pipe PreparationStep G Step BStep E Step FDo not TRY to Light the Burner by Hand Power Before ServicingDo not try to light the burner by hand What to do if YOU Smell GASD E F Temperature RegulationTemperature Indicators Temperature Adjustment Buttons DisplayOperational Conditions For Your InformationStart UP Conditions Anode ROD Inspection Periodic MaintenanceOpen the water heater drain valve to flush the storage tank Temperature-Pressure Relief Valve TestKeep hands clear of drain To Flush the Water Heater Storage TankLeakage Checkpoints ServiceTrouble Shooting Troubleshooting GuidelinesUnplug ignitor assembly plug from control. Check resistance Ensure the flame sensor is clean use ultra fine steelTurn off power to the water heater Assembly if damaged or defectiveCheck vent temperature limit switch if it is determined Unplug the ignitor assembly plug from the control. CheckResistance of the black resistor wire between pins Assembly .2 If the reading taken is less than 100,000Troubleshooting Guidelines ALL Other Parts Service and Repair ExpensesClaim Procedure Tank
Top Page Image Contents