Sun Heat F-15 Gen III Assembly instructions

F-15 Gen III Fireplace
Repair Guide
!! Unplug The Heater Before Servicing!!
(Remember That The Edges Of the Metal Are Sharp. Use Caution)
Reference Sections:
A. Remove Center From Mantle.
B. Remove Center Top Cap.
C. Remove Front Glass.
D. Remove Fire Log Set & Firelight Screen.
E. Replace Heat Tubes.
F. Replace High Temp. Limit Switch. (120c)
G. Replace Heat Exchanger Fan Switch. (45c)
H. Replace Flame Effect On/Off Switch.
I. Replace Flame Effect Fuse. (1 amp)
J. Replace Master Reset Breaker. (16 amp)

K. Replace Heat Exchanger Circulation Fans. (12 volt)
L. Replace Tip Over Switch.
M. Replace 12 volt Fan Power Supply Circuit Board.
N. Replace Central Control Circuit Board.
O. Replace Function Display Screen.
P. Replace Air Temp. Sensor & Cover.
Q. Replace Flame Effect Light Bulb Socket.
R. Replace AC Case Fan.
S. Replace Fire Light Drive Rod Motor.
T. Replace Power Cord.
U. Replace Center Mounting Anchors.
V. Wiring Diagrams.
Questions: Call
Customer Service
1-800-652-1916

A
Remove Center From Mantle
Unscrew the 4 wing bolts that hold the fireplace center into the wooden
mantle. (See wing bolt locations below) After the removal of the wing bolts, slide
the fireplace center out the front of the mantle. (Note) Be careful to protect the
lower lip of the mantle with a piece of cardboard or sheet of heavy plastic. There
are screw heads on the bottom of the metal center that will damage the finish on
the wood if not protected.
Wing Bolts

B
Remove Center Top Cap
With the center removed from the mantle, lower the front grill to gain access
to the (switch/fuse panel). This panel is located on the left side. Remove the 4
screws that hold this panel in place.
After the removal of the 4 screws that hold this panel in place. Tilt the panel
at a slight angle and place into the hole that the panel covers.

B
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Remove the 11 perimeter screws that hold the center top cap in place.
Perimeter Screws
Perimeter Screws
Perimeter Screws

B
After removing all of the perimeter screws, lift the top cap upward from the
front. (Note) Be careful not to lift the top cap too far or damage may occur to the
wires that connects the function display screen to the central control circuit board.
Disconnect the wire harness that runs from the function display screen to the
central control circuit board.

C
Remove Glass
Remove the 2 screws that hold the metal glass cap down. See screw locations
below.
Remove the metal glass cap.
Remove Screws

C
Remove the 2 metal U clips that hold the glass into its channel. The U clips
are located to the left and right under the metal glass cap.
Slide the glass up and out of it guide channel.

D
Remove Fire Log Set & Fire Light Screen
Remove the 4 screws that hold the fire log set in place. There are 2 screws at
each end of the fire log set. These screws are accessed through holes in the metal
case. (See Screw Locations Below)
Screws
Screws

D
Lift the fire log set up at one end. The log set may be wedged into the case.
As you remove the log set, you may have go wiggle it slightly to free it. (Note) The
log set is made out of fiberglass. Applying excessive force may cause damage.

D
Remove the 6 screws that hold the fire light screen into the fireplace. See
screw locations below.
Removing the fire light screen will give access to the fire light drive rod, drive
rod motor and the AC case fan.
Screws

E
Remove Heat Tubes
After determining which of the 3 heat tubes has failed, use a 7mm wrench to
loosen the nuts on each end of the heat tube that holds the power wires in place.
Remove the 2 screws that hold the heat tube access plate in place.
Remove Screws

E
After removing the heat tube access plate, slide the malfunctioning heat tube
out of the heat exchanger.

F
Replace High Temp. Limit Switch (120c)
To gain full access to the high temp limit switch, the heat exchanger
assembly needs to be removed from the fireplace. There are 4 anchor screws that
hold the heat exchanger assembly in place. These screws need to be removed.
(See Screw Locations Below)
Anchor Screws
Anchor Screws

F
After removing the heat exchanger, flip the exchanger over so that the black
mounting plate is facing up. Remove the 2 bolts from the fan closest to the high
temp limit switch.
After removing the bolts above flip the heat exchanger over so the black
mounting plate is sitting on the bench. Remove the 2 nuts that are holding the fan
in place and remove the fan.

F
Using needle nose pliers, hold the nut that holds the high temp limit switch in
place from the inside of the heat exchanger. Remove the nut and screw.
After removing the screw & nut that holds the switch to the heat exchanger,
remove the 2 screws that hold the Mica insulator plate in place. (See Screws
Locations Below)
Insulator Plate Screws
Mica Insulator Plate

G
Replace Heat Exchanger Fan Switch (45c)
After removing the center top cap (B). The fan switch is located on the right
side of the heat exchanger. Remove the 2 screws that hold the switch in place and
remove.

H
Replace Flame Effect On/Off Switch
Remove the 4 screws that hold the (switch/fuse panel) in place.
After removing the wires that connect to the switch, use pliers to compress
the tabs that lock the switch into the metal plate. (See Below)

H
After compressing the locking tabs on the switch, remove the switch through
the front of the plate. (See Below)

I
Replace Flame Effect Fuse (1 amp)
Place a small flat screwdriver under lifting tab.
Carefully lift up fuse holder to gain access to the 1 amp fuse.