58 • Condensing Models: On-Demand Water Heater Service Handbook
MAINTENANCE
8.10 Disconnect the solenoid
connectors (Item 707, p.
69) from the gas valve.
(There are three connectors.)
8.11 Inspect the gaskets on the
manifold plate for any tears.
If compromised, replace with
part number 319143-044
(item 113) and/or 319143-
045 (item 114). See page
69.
8.12 Inspect the o-ring (item 151,
p. 69) and gas inlet ring
(item 119, p. 69) on the gas
connec on for cuts or breaks.
If damaged, replace with part
number 319143-057 (item 151)
and/or 319143-049 (item 119).
See page 69.
9. Remove the burner from the
combus on chamber:
9.1
Remove three screws across
the front of the burner
(Figure 69).
DO NOT
remove
the screws around the
fl
ame
sensor/AFR and igniter rods.
9.2
Remove two screws below
the burner, at the back
(Figure 69).
9.3
Slide the burner out toward
you. If it is di
ffi
cult to
remove, try the following:
1.) Grasp an oval air vent
on the front of the burner
(at the edge on either
side). 2.) Pull
fi
rmly while
pushing on the bo om of
the combus on chamber to
provide leverage.
3.) Repeat on the opposite
side. 4.) Pull from the center.
It should slide out easily.
9.4
Check the gaskets on the
burner for tears. If the
gaskets are compromised,
replace with part number
319143-032.
Fuse Box
Location
Manifold
Plate
Plugs (2)
(Yellow Wires)
Receptacles
(2)
(Yellow Wires)
Install Plugs into Receptacles
Figure 71.
Manifold Screws:
• DO NOT remove the screws
shown below (indicated by
white, crossed-out circles).
• Remove the remaining
screws along the outside
edge (except as indicated).
Figure 70.
Solenoid (SV3)
Terminals
M
anif
old
Plate
Manifold
Plate
Figure 72.
Front View of Burner Assembly
Three Screws
Three Screws
Two Screws
Area Beneath Burner (Inside Cavity)
Figure 69.
