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SERVICE PROCEDURE PDV24-III
Pilot Operation Testing
CAUTION
Be Careful When Making Voltage
Measurements or Jumping Terminals
Not to Damage or Deform Connectors or
Connector Pins.
DANGER
120 volt exposure. To avoid personal injury,
use caution while performing this procedure.
Condition:
Pilot will not light or stay lit,
Error codes 62, or 63 shown on Water
Heater Display
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)
N
Y
Loosen pilot tubing connection at
the gas valve and soap test.
Is there pilot gas flow out of the
gas valve? See pilot illustration
for pilot inspection.
Tighten pilot tube connection at
the gas valve. Check incoming
gas pressure to water heater. if
okay, replace gas valve
Check for clogged or kinked pilot
tube, clogged pilot orifice. Clean
or replace as needed.
(see photo below)
Is there 22-27 volts AC input across
wire leads
“MV/PV” & “PV”
at Gas Valve?
(see photo to the right)
Check wire harness for damage or
loose connections. Repair or replace
as needed.
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)
Replace control board
Check across “MV/PV” & “PV” Wire
leads to gas valve
Y
Y
Y
N
N
Replace control board.
Is there spark at the pilot?
Check for:
Loose or damaged ignition wire
Grounded pilot electrode
Damaged pilot.
Y
N
Checking for 24
volts output to
pilot valve
(yellow and red
wire pin
terminals on
control board
“control” plug.
N
Turn on power to the water heater
and verify proper operation
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).
Flame Sense
Wire
Ignition
Wire
Ceramic
Insulators
Flame
Rod
Pilot
Orifice
7//16"
ferrule
Nut
Aluminum
Pilot Tubing
30