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SERVICE PROCEDURE PDV24-IV
Main Burner 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:
Main burner short cycles.
Control Display may show error
code “63, 57, or 4” and be in
“Soft Lockout” state.
Check gas (line) pressure to the
water heater.
Minimum line pressure should be
5.5" W.C.
Is gas pressure within proper
specification? (see photo at right)
Determine cause of
incorrect gas
pressure and correct.
Check venting conditions.
(blocked intake or exhaust
terminal, excessive vent length,
or number of elbows)
Verify pressure switch is not
cycling (see “Pressure Switch
Testing”.
Is vent system okay?
Correct improper
venting condition.
N
Is there sufficient combustion air
being supplied to the water
heater?
PDV(S&T) MODELS: Check
intake piping and terminal.
INDUCED DRAFT MODELS:
Make sure there is sufficient
air supply to utility room.
N
Check burner tubes for scale or
debris build-up. Clean burner(s)
as necessary.
(see “main burner inspection”)
Check tank flues for blockage or
debris build-up causing
restriction.
(see “flue baffle inspection”)
Check for unstable pilot flame or oxidized
flame rod on pilot causing weak pilot
signal. Make sure pilot shield is in place
and does not touch pilot flame sensor.
(see “pilot inspection”)
Line gas
pressure port
Manifold
Pressure Port
Y
Connect hose barb to manifold
pressure port, then connect
monometer to measure gas manifold
pressure.
Y
Y
N
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