Bradford-White Corp Bradford White Cross Reference and Water Heater Service Procedures

SERVICE PROCEDURE PDV24-III

Pilot Operation Testing

DANGER

120 volt exposure. To avoid personal injury, use caution while performing this procedure.

CAUTION

Be Careful When Making Voltage

Measurements or Jumping Terminals Not to Damage or Deform Connectors or Connector Pins.

Condition:

Pilot will not light or stay lit,

Error codes 62, or 63 shown on Water

Heater Display

Reset control by pressing the lower right button under “reset” on the display for 3 seconds. Does control board start ignition sequence and start sparking (sparking noise at pilot or at board)

Y

Is there spark at the pilot?

Y

Is there 22-27 volts AC output across terminal pins 8 & 2 on “Control” plug of Control Board? Carefully insert meter probe in wire plug to check pin terminals. Make sure control is in the trial for ignition sequence (see sequence of operation).

(see photo at top of page)

Y

Checking for 24

		volts output to
		pilot valve
		(yellow and red
		wire pin
		terminals on
		control board
N		“control” plug.
	Replace control board
		Check across “MV/PV” & “PV” Wire
	Check for:
N		leads to gas valve
	Loose or damaged ignition wire
	Grounded pilot electrode
	Damaged pilot.

N Replace control board.

Is there 22-27 volts AC input across

wire leads

“MV/PV” & “PV” at Gas Valve?

(see photo to the right)

N

Check wire harness for damage or loose connections. Repair or replace as needed.

Turn on power to the water heater

and verify proper operation

Loosen pilot tubing connection at

Ythe gas valve and soap test.

Is there pilot gas flow out of the

gas valve? See pilot illustration

for pilot inspection.

N

Tighten pilot tube connection at the gas valve. Check incoming gas pressure to water heater. if okay, replace gas valve

Checking MV pin terminal to gas valve wire harness for 24 volts output to gas valve during heating cycle (pilot must be lit with no sparking).

Check for clogged or kinked pilot

Ytube, clogged pilot orifice. Clean

or replace as needed.

(see photo below)

Flame

Rod

Ceramic Insulators

Pilot Orifice

Ignition

Wire

7//16" ferrule

NutFlame Sense Wire

Aluminum

Pilot Tubing

30