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Sunheat F-15 Gen III Repair Manual

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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)

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Summary of Contents for Sunheat F-15 Gen III

  • Page 1 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.
  • Page 2 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.
  • Page 3 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.
  • Page 4 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.
  • Page 5 ------------------------------------------------------------------------------------- Remove the 11 perimeter screws that hold the center top cap in place. Perimeter Screws Perimeter Screws Perimeter Screws...
  • Page 6 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.
  • Page 7 Remove Glass Remove the 2 screws that hold the metal glass cap down. See screw locations below. Remove Screws Remove the metal glass cap.
  • Page 8 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.
  • Page 9 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.
  • Page 10 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.
  • Page 11 Remove the 6 screws that hold the fire light screen into the fireplace. See screw locations below. Screws Removing the fire light screen will give access to the fire light drive rod, drive rod motor and the AC case fan.
  • Page 12 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...
  • Page 13 After removing the heat tube access plate, slide the malfunctioning heat tube out of the heat exchanger.
  • Page 14 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...
  • Page 15 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.
  • Page 16 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.
  • Page 17 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.
  • Page 18 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)
  • Page 19 After compressing the locking tabs on the switch, remove the switch through the front of the plate. (See Below)
  • Page 20 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.
  • Page 21 Replace Master Reset Breaker (16 amps) Remove the 4 screws that hold the (switch/fuse panel) in place. Hold the master reset breaker as you loosen threaded securing nut from the front. (See Below)
  • Page 22 Replace Heat Exchanger Circulation Fans (12 volt) Remove Center top cap. To gain access to the heat exchanger circulation fans the heat exchanger must be removed from the fireplace. There are 4 anchor screws that hold the heat exchanger assembly in place. These screws need to be removed.
  • Page 23 After removing the heat exchanger, flip the exchanger over so that the black mounting plate is facing up. Remove the 2 bolts from the defective fan. 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.
  • Page 24 Replace Tip Over Switch Remove the center top cap from the fireplace. The tip over switch is located to the right of the heat exchanger. Remove the wires from the tip over switch. After removing the wires from the tip over switch turn the fireplace around so that you are facing the rear.
  • Page 25 Replace 12 volt Fan Power Supply Circuit Board Remove the center top cap. The 12 volt power supply is located to the right of the heat exchanger & to the rear of the main circuit board. Remove the fan power plugs and the main power supply to the board. (See Locations Below) Fan Power Plugs Main Power Supply Using a 7/32 nut driver;...
  • Page 26 Replace Central Control Circuit Board Remove the center top cap. The central control circuit board is located to the right of the heat exchanger. Remove all wires connected to the circuit board. Disconnect the air temperature sensor plug from the circuit board. (See Location Below) Remove the 4 hold down nuts.
  • Page 27 Replace Function Display Screen Remove the center top cap. Pull the function display screen wire harness through the access cover. Remove the 4 screw that hold the function display screen into place on the front cover. Remove the display screen through the front of the cover.
  • Page 28 Replace Air Temperature Sensor & Cover The air temp sensor cover is located on the lower access panel of the fireplace. Remove the access panel and lay on the service bench face down. Remove the 2 screws that hold the plastic air temp sensor in place. Disconnect the air temp sensor wire coupler and draw through the front access panel hole.
  • Page 29 Replace Flame Effect Light Bulb Socket There are 2 light sockets located behind the lower access panel. Hold the base of the light socket with one hand while unscrewing the anchor ring. Remove the light socket from its metal bracket and trace the wire back to it connection location.
  • Page 30 Replace AC Case Fan To gain access to the ac case fan fallow steps (A), (B), (C) & (D). After gaining clear access to the ac case fan, hold each one of the 4 lock nuts in place with a 7mm wrench.
  • Page 31 Replace Fire Light Drive Rod Motor To gain access to the ac case fan fallow steps (A), (B), (C) & (D). After gaining clear access to the fire light drive rod motor, manually rotate the drive rod counterclockwise to gain access to the (cotter key) that holds the drive rod collar onto the drive rod motor.
  • Page 32 After removal of the nuts & screws that hold the drive rod motor bracket in place, rotate the drive rod motor assembly to gain access to the wiring. Clip the wire tie that holds the wires together. (Note: Take Care Not To Clip The Wires) After manipulation of the drive rod motor &...
  • Page 33 Replace Power Cord To gain access to the power cord fallow steps (A), (B). Remove the power leads from the circuit board. Ground Wire Power Cord Leads To gain access to the lock nut that holds the ground wire in place, fallow steps (C) &...
  • Page 34 After disconnecting the power leads from the circuit boards and removing the nut & bolt that holds the ground wire in place, turn the fireplace around to gain access to the power cord. Using water pump pliers compress the plastic grommet that holds the power cord in place and remove it.
  • Page 35 Replace Center Mounting Anchors To gain clear access to the 4 center mounting anchors, fallow steps (A), (B), (C) & (D). Using two sets of pliers hold the mounting anchor from the inside of the fireplace metal case. Loosen the mounting anchor from the back side of the fireplace case.
  • Page 36 Center Mounting Anchor Locations...

  • Page 37: Wiring Diagrams

    Wiring Diagrams...