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Replace the front cover and
25
secure with the four screws
removed earlier. Note the placement of
the built-in controller when se ng the
front cover in place to ensure proper
alignment.
Turn on the gas supply to the water
26
heater at the manual gas shutoff
valve.
Reconnect power to the water
27
heater by plugging it into the
wall outlet or turning it on at the circuit
breaker, as appropriate. Press the On/
Off bu on to turn the water heater back
on.
Turn on the gas supply to the water
28
heater at the manual gas shutoff
valve.
Verify proper opera on of the
29
water heater.
Removing and
Replacing the
Thermistor Inlet
Plug
WARNING!
• To ensure your safety and the
safety of others, read and follow
each step of these instructions.
Failure to do so could result in
personal injury or death.
• If you do not have the skills
necessary to complete this
procedure correctly, do not
proceed. Seek assistance from a
qualified service technician.
Removing and replacing the thermistor
inlet plug:
Tools Needed: #2 Phillip's Head
Screwdriver and needle nose pliers.
NOTICE: DO NOT USE ELECTRIC
SCREWDRIVERS OR DRILLS, HAND
TIGHTEN ALL SCREWS TO PREVENT
OVER TIGHTENING.
Disconnect power to the water
1
heater by unplugging it from the
wall outlet or turning it off at
the circuit breaker, as appropriate. The
power button on the water heater and
remote does NOT disconnect power to
the water heater. You must physically
disconnect power to the water heater.
Use a non-contact circuit tester to
confirm that power is off before
working on or near any electrical parts.
Shut off the gas supply to the
2
water heater at the manual gas
shutoff valve.
Use a Phillips-head screwdriver
3
to remove the 4 screws securing
the cover to the water heater. Set the
front cover and screws aside for re-
installa on.
Locate the wire on the built-in
4
controller and follow it to the
computer board. Carefully disconnect
the
built-in
controller
computer board. Reference the wiring
diagram on page 28 or in the
maintenance sheet. Set the built-in
controller aside for re-installa on.
Built In Controller
Connector
Connecto
o r
o
o
r
r
r
r
r
r
r
Figure 88: Built-in controller removal.
Locate the M4 screw as shown in
5
Figure 89. Remove and keep this
screw for re-installa on.
Remove and replace the closing
6
plug referenced in Figure 89.
On-Demand Water Heater Service Handbook for X3P Models
Secure it in place with the M4 screw
removed earlier.
A ach the built-in controller to
7
the front of the water heater.
Reconnect the wire from the built-in
controller to the computer board. See
Figure 88.
Closing Plug #732
Figure 89: Thermistor Inlet Plug
Before proceeding , take a moment
8
to check the wiring connec on and
pipe connec ons. Make sure all are mated
correctly and seated securely.
Replace the front cover and
9
secure with the four screws
from
the
removed earlier. Note the placement of
the built-in controller when se ng the
front cover in place to ensure proper
alignment.
Turn on the gas supply to the water
10
heater at the manual gas shutoff
valve.
Reconnect power to the water
11
heater by plugging it into the
wall outlet or turning it on at the circuit
breaker, as appropriate. Press the On/
Off bu on to turn the water heater back
on.
Verify proper opera on of the
12
water heater.
M4 Screw
•
67
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