Issue 2 14/07/16
97
Appendix 10
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.
10.6.3 Pilot operation testing
Condition:
Pilot lights, no or low flame signal.
Control Display shows “4” or “62”
for Error Codes (Service Needed).
Control continues to spark until
system “Lock Out”. Main burner
will not light.
Check for loose or damaged flame
sense lead from pilot to Control
Board. (see illustration to the
right). Is flame sense lead okay?
Repair wire lead or replace pilot.
No
Repair ground wire(s) or replace
as needed.
No
Yes
Check for loose or damaged
ground wire(s) from gas valve to
control board. Check continuity of
wires with ohmmeter. Are ground
wires okay?
The microamp output of the pilot
may be checked by entering
“Service Mode” on the water
heater display and pressing
“Select” until the flame current is
shown. The control must be in the
heating mode with the pilot lit to
display a reading. See section on
accessing service mode on the
water heater display.
Yes
Correct improper venting
condition. Refer to Installation
Instructions
No
Make sure pilot shield is in place
and not bent or damaged (refer to
section on main burner and pilot
assembly) . Determine cause for
condensing and correct. (Possible
under sized water heater or high
demand periods.)
NOTE:
Check continuity of sense lead to
flame rod.If no continuity, clean
pilot flame rod or replace pilot.
Check pilot flame appearance - if
weak check for clogged pilot
orifice, bent pilot tubing, or low
inlet gas pressure. (see above
illustration)
No
Check venting conditions or
negative pressure. Is vent system
okay?
Micro-amp readings
0.000 Micro Amp =
Replace control board or pilot if wire is damaged.
1.0 micro amp or less = Clean pilot flame rod or replace pilot.
Is heater condensing causing pilot
interruption?
Yes
Yes
Meter
Probe
Meter
Probe
Checking pilot flame sensor wire and
flame rod for continuity.
Pilot flame sensor microamp output shown
in display using service mode. Pilot must be
lit to get reading.
Multi-meter set
to check
continuity
Flame
Rod
Fig. 87
Fig. 88
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