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Secure the gas valve assembly to
10
the gas inlet mount at
the screw removed earlier. See Figure 38
on page 49.
Rea ach the wiring harness and
11
secure it at
2
with the screw
removed earlier. See Figure 38 on page
49.
Reconnect the copper gas pipe to
12
the new gas valve assembly at
. Inspect the o-ring on the copper gas
pipe, if any cuts or nicks are present
replace the o-ring immediately. Secure
the copper gas pipe using the 16-25A
metal fastener removed earlier. See
Figure 38 on page 49.
Return the computer board to its
13
original loca on in the water
heater housing. Reinstall and secure the
surge box fi xing plate with the screw
removed earlier. Restore the wiring to
its original loca on. See See Figure 37 on
page 49.
A ach the built-in controller to
14
the front of the water heater.
Reconnect the wire from the built-in
controller to the computer board. See
See Figure 36 on page 49.
Before proceeding , take a moment
15
to check the wiring connec on
and pipe connec on. Make sure all are
mated correctly and seated securely.
Replace the front cover and
16
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
17
heater at the manual gas shutoff
valve.
Reconnect power to the water
18
50
•
On-Demand Water Heater Service Handbook for X3P Models
heater by plugging it into the wall
using
outlet or turning it on at the circuit
3
breaker, as appropriate. Press the On/
Off bu on to turn the water heater back
on.
Verify proper opera on of the
19
water heater.
Removing and
1
Replacing the
Primary Heat
Exchanger
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 the primary heat exchanger:
Tools Needed: #2 Phillip's Head
Screwdriver, #2 Phillip's Head
Screwdriver (16" or longer with
magnetic tip), 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.
Shut off water to the water
3
heater and drain the system.
Place a bucket under the water heater
and open the plas c drain port located
on the bo om le side of the water
heater. Allow the system to completely
drain before proceeding.
Use a Phillips-head screwdriver to
4
remove the 4 screws securing the
cover to the water heater. Set the front
cover and screws aside for re-installa on.
Remove the screw securing the
5
le
side of the rain protec on
tray. Slide the rain protec on plate from
the water heater. Keep the screw with
the rain protec on tray for re-
installa on.
Remove the white plas c cable
6
clips securing the various cables
to the copper gas pipe.
Locate the plas c computer
7
board housing on the bo om
right side of the water heater. Remove
the screw and bracket securing the
plas c housing for the computer board.
Keep the screw and bracket for re-
installa on. Slide the computer board
and plas c housing out from the water
heater to access the cable connec ons.
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