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both the igniter and at the
computer board. Unplug and
reconnect them to clean the
electrical connec ons.
4.2
Check the igniter rod to
make sure the black wire is
properly a ached and that
the rod doesn't move. If
the rod moves, replace the
igniter rod. You will also need
a rod holder gasket.
4.3
When the igniter is sparking,
check the voltage across the
purple wires coming to the
igniter. Normal voltage is
108-132 VAC. If voltage is
outside of this range, then
replace the computer board.
(See item 701 on page 77 for
the correct part number.)
4.4
If the previous steps s ll
don't result in a spark being
generated, replace the igniter.
5. If flame comes on for only 1-2
seconds before going out, verify
that the green IN USE LED on
the built-in controller or remote
controller did not turn on. If the
LED stayed off, then inspect the
flame sensor. Clean it if necessary.
Replace it if any damage (chips or
cracks in the ceramic) is seen or
if the metal rod can move freely
in the ceramic insulator. See
"Cleaning the Flame Sensor and
Igniter Rod)" on page 33.
Unplug both ends of the wiring
harness from the igniter assembly
and control board, then reconnect
them to ensure good connection.
Also, verify that the green wire that
is part of the circuit is attached
to one of the screw connections
around the manifold.
6. Verify proper operation of the
main gas valve (MV). To do so,
turn the power off, then check the
resistance of the MV. A normal
resistance is 1.15-1.65 kΩ. If the
resistance is out of range, replace
the gas valve.
7. Verify proper operation of the gas
solenoid valves. To do so, turn
the power off, then check the
resistance of the valves. A normal
resistance reading for SV1 is 1.35-
On-Demand Water Heater Service Handbook for X3P Models
1.65 kΩ. Normal resistance for SV2
and SV3 is 2.07-2.53 kΩ. If the
resistance is out of range, replace
the gas valve.
Code 201: Combus on Air and
Gas Line Failure
• Check if the pressure sensor is
functioning properly.
• Check if the fan motor is functioning
properly.
• Check for connection /breakage of
wires, burn marks on the PCB.
Code 211: Air Pressure Sensor
Failure
• Check the voltage between the
black and red wires. Normal: 4 to 6
VDC between black & red (during
operation)
• Replace the pressure sensor if
the voltage is outside of the range.
Replace the PCB if the voltage is within
the normal voltage range.
•
17
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