A.O. Smith Water Heater HWB-610 Propane

Attach the leads from a millivolt meter to the thermocouple and junction block and record the reading

Is the thermocouple reading above 14 to 18 millivolts?

Transfer the lead on the junction block to other terminal and record the reading

Is the voltage supply reading between 8 to 14 millivolts?

If the reading is less than 8 millivolts, describe the issues found with the junction block connections and protector switch leads

Enter the millivolt drop across the contacts

Pilot Burner - Electronic Ignition

Open fused disconnect switch or shut off electrical power to the boiler.

Turn the gas valve control knob counterclockwise to the 'PILOT' position.

Close fused disconnect switch to restore electrical power to the boiler.

Did the pilot ignite with the combination gas valve knob set at 'PILOT' and the system calling for heat?

Adjust pilot flame to cover 3/8" to 1/2" (10-12mm) of the sensing probe tip.

Did the main burner light after pilot ignition?

If the main burner fails to light, check the following:

Replace valve if electrical power and gas are present but the valve does not open when system calls for heat.

Main Burner Characteristics Check

Verify main burner characteristics

Is there any accumulation of lint or foreign material?

Is there good flow of combustion and ventilating air to the unit?

Turn off the electrical power and close the main manual gas shutoff valve.

Allow boiler parts to cool before disassembly?

Remove main burner manifold assembly from boiler.

Ensure the boiler is turned off and cooled down

Verify that all necessary cleaning solutions and tools are available

Drain the existing water from the system

Inspect the drained water for contaminants

Calculate the proper percentage of cleaning solution based on system water volume

Add the cleaning solution to the system

Initial Lubrication Before Operation

Oil the three oil cups (2 on the motor, 1 on the pump) as instructed on the oil tube supplied with the unit.

Regular Lubrication During Heating Season

Lubricate the three oil cups at least once every four months.

Ensure lubrication of the following oil cups

Lubrication for Combination Heating-Cooling Systems

Lubricate the three oil cups every four months year-round.

Use 2 or 3 teaspoonsful in bearing oil cups.