A.O. Smith BTF-75 warranty Troubleshooting, Vent Pipe TOO HOT, Above 170 F, Yellow Flame

Page 17

WARNING: DO NOT BY-PASS ANY CONTROLS TO MAKE HEATER OPERATE. OPERATE ONLY AS WIRED FROM FACTORY.

TROUBLESHOOTING

For your safety, water heater service should be performed only by a qualified service technician.

Read the GENERAL SAFETY INFORMATION section first.

 

PROBLEM

 

 

 

POSSIBLE MALFUNCTION

SERVICE TO BE PERFORMED

 

 

 

 

1)

Blower will not run

 

 

 

 

 

 

 

A)

“ON/OFF” control switch turned off

Turn switch to the “ON” position.

 

 

 

 

B)

Blower unplugged

Plug blower back into 115 vac. outlet.

 

 

 

 

C)

No power at outlet

Repair service to outlet.

 

 

 

 

D)

“ON/OFF” switch defective

Replace switch.

 

 

 

 

 

E)

Control harness defective

Replace control harness.

 

 

 

 

F)

Blower motor defective

Replace blower and motor.

 

 

 

2)

Blower running, burner not on

Replace switch.

 

 

 

 

A)

Fan not running fast enough to close

Check for low voltage, less than 102 vac., have service

 

 

 

 

 

air switch contacts

 

checked and repaired.

 

 

 

 

 

 

 

 

If voltage is above 102 vac., make sure there is not more than

 

 

 

 

 

 

 

30 Equivalent feet of 3 inch pipe or 85 equivalent feet of 4 inch

 

 

 

 

 

 

 

pipe installed or vent terminal blockage.

 

 

 

 

 

 

 

If at least 102 vac., less than 30 equivalent feet of 3 inch pipe

 

 

 

 

 

 

 

 

or 85 equivalent feet of 4 inch pipe and not terminal blockage,

 

 

 

 

 

 

 

replace blower.

 

 

 

 

B)

Air pressure switch defective

Replace switch.

 

 

 

 

C)

Gas valve defective

Replace gas valve.

 

 

 

 

D)

Control harness defective

Replace harness.

 

 

 

 

E)

Igniter defective

Replace igniter.

 

 

 

 

F)

Unit has completed three trials to light

Reset cycle by turning switch off and then back on. If unit

 

 

 

 

 

and failed

does not light in three trials, call an authorized A.O. Smith

 

 

 

 

 

 

 

service representative.

 

 

 

 

G)

Discharge air limit tripped

Verify dilution air openings are free of obstructions.

 

NOT ENOUGH OR

 

 

 

 

 

Make sure there is no more than 30 equivalent feet of 3 inch pipe or

 

 

 

 

 

 

85 equivalent feet of 4 inch pipe.

 

NO HOT WATER

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Check for low voltage, less than 102 vac., have service

 

 

 

 

 

 

 

 

 

 

 

 

 

 

checked and repaired.

 

 

 

 

 

 

 

 

Make sure vent terminal is not blocked.

 

 

3)

Thermostat problems

 

 

 

 

 

 

 

A)

Thermostat set too low

Turn temperature control higher.

 

 

 

 

B)

Thermostat or ECO defective

Replace thermostat.

 

 

 

 

C)

High limit control circuit open

Replace.

 

 

4)

Others

 

 

 

 

 

 

 

A)

Heater undersized

Reduce hot water use.

 

 

 

 

 

B)

Low gas pressure

Contact an authorized A.O. Smith service representative.

 

 

 

 

C)

Incoming water is unusually cold

Allow more time for heater to re-heat.

 

 

 

 

D)

Leaking hot water pipes or fixtures

Have plumber check and repair leaks.

 

 

 

 

 

A)

Blower does not run when heater fired

Take unit out of service immediately, call an authorized A.O.

 

 

 

 

 

 

 

 

Smith service representative.

 

 

 

 

 

B)

Not enough dilution air to mix with flue

Proper air circulation must be provided for combustion and

 

VENT PIPE TOO HOT

 

 

 

gases in “Tee”

dilution of flue temp. Refer to “INSTALLATION” section.

 

(ABOVE 170° F)

 

 

C)

Air in room too hot for mixing with flue gases

Room air to be used for dilution with combustion products in

 

 

 

 

 

 

 

flue should be less than 90°F.

 

 

 

 

 

 

 

 

 

 

 

D)

Wrong burner orifice

Install correct orifice.

 

 

 

 

 

A)

Dirt in burner ports

Turn off heater and gas, clean burner head.

 

 

 

 

B)

Combustion air path restricted

Clear area around heater and check under heater, remove

 

YELLOW FLAME

 

 

 

 

 

any debris under heater and in openings in bottom cover.

 

 

 

 

C)

Not enough room air for proper combustion

Refer to installation manual - Confined and Unconfined Space

 

 

 

 

 

 

 

statements on page 4 and 5 for required openings.

 

CONDENSATION

 

 

A)

Water on the floor under heater

See “CONDENSATION.”

 

 

 

 

B)

Water dripping from fan

Provide drip “TEE” to catch condensation, refer to pages 8 and 10.

 

 

 

 

 

 

 

Improperly sealed, hot or cold supply connections,

Turn off heater & water, repair unit.

 

WATER LEAKS

 

relief valve, drain valve or thermostat threads

 

 

 

 

 

Leakage from other appliances or water lines

Inspect other appliances near water heater.

 

 

 

 

 

 

 

Condensation of flue products

Refer to “CONDENSATION.”

 

LEAKING T&P VALVE

 

Thermal expansion in closed water system

Install thermal expansion tank (DO NOT plug T&P valve).

 

 

 

Improperly seated valve

Check relief valve for proper operation (DO NOT plug T&P valve).

 

 

 

 

HOTWATERODORSORCOLOR

 

High sulfate or mineral content in water supply or

Drain and flush heater thoroughly, chlorinate, refill and flush

 

 

iron or sulfate reducing bacteria in water supply

again then chlorinate water supply.

 

(RefertoCATHODICPROTECTION)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

17

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Contents SmartValve is a Registered Trademark of Honeywell Inc Commercial GAS, GLASS-LINED, TANK-TYPE Water HeaterALL Dimensions in Inches ROUGH-IN-DIMENSIONSRecovery Capacities ForewordGeneral Safety Information Table of ContentsInstallation Unconfined Space AIR RequirementsConfined Space Water ConnectionsClosed Water System Venting Single TemperatureRelief Valve Vent Pipe TerminationIf using 4 inch vent pipe If using 3 inch vent pipePlanning the Vent System Number Maximum Elbows Pipe FeetPreparation of Blower Assembly Installation of Sidewall Vent SystemVent Terminal INSTALLATION, Sidewall Power Vent Wiring Schematic Figure Installation of Vertical Vent System Installation of Vent SYSTEM, SidewallVent Pipe Preparation Initial PreparationCement PrimerMaking the Joint Step aGAS Connections OperationConnection of GAS Pipe To Operate the HeaterDo not TRY to Light the Burner by Hand WatertemperatureadjustmentWhat to do if YOU Smell GAS Do not TRY to Light the Burner by HandTemperature Regulation MaintenanceWater Temperature Adjusting Dial PurgingPower Venter Maintenance High Temperature CUT-OFF SwitchVenting System ValveTrouble Shooting Service and RepairCondensation Cathodic PROTECTION-ANODEVent Pipe TOO HOT TroubleshootingAbove 170 F Yellow FlameFlash Troubleshooting with the LEDOFF YES Check for Proper Voltage ATTurn on GAS Supply Plug Replace HSIClaim Procedure Service and Repair ExpensesTank ALL Other Parts