Dimplex BLF74 Building instructions

Service Manual
Model
BLF74
UL Part Number
6908740100
7400740000R00
In keeping with our policy of continuous product development, we reserve the right to make changes without notice.
© 2013 Dimplex North America Limited
Dimplex North America Limited
1367 Industrial Road Cambridge ON Canada N1R 7G8
1-888-346-7539 www.dimplex.com
REV PCN DATE
00 - 26-NOV-13
IMPORTANT SAFETY INFORMATION: Always read this manual rst before attempting to service this replace. For your
safety, always comply with all warnings and safety instructions contained in this manual to prevent personal injury or prop-
erty damage.

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Always use a qualied technician or service agency to repair this replace.
!NOTE: Procedures and techniques that are considered important enough to emphasize.
CAUTION: Procedures and techniques which, if not carefully followed, will result in damage to the equipment.
WARNING: Procedures and techniques which, if not carefully followed, will expose the user to the risk of re, serious
injury, or death.
Operation .................................................. 3
Maintenance................................................ 4
Exploded parts diagram ...................................... 5
Replacement Parts List....................................... 5
Wiring Diagram ............................................. 6
Preparation for service ....................................... 7
Instructions for removing from wall ............................ 7
Surface Mount .............................................................. 7
Flush Mount – Complete In-wall ............................................... 8
On/Off Switch Replacement ................................... 8
Remote Switchboard Replacement ............................. 9
Remote Control Receiver Replacement ......................... 9
LED Driver Board Replacement ............................... 10
Voltage Selector Switch Replacement.......................... 10
Flicker Motor/ Flicker Rod Replacement........................ 11
Terminal Block Replacement ................................. 11
LED Light Strips Replacement................................ 12
High Temperature Cutout Replacement ........................ 12
Element Replacement ....................................... 13
Blower/fan Replacement..................................... 13
Troubleshooting Guide ...................................... 15
TABLE OF CONTENTS

3
the replace off and it will not come back on without being
reset. It can be reset by switching the On/Off Switch to Off
and waiting ve minutes before switching the unit back on.
CAUTION: If you need to continuously reset the heater,
disconnect power and call Dimplex customer service at
1-888-DIMPLEX (1-888-346-7539).
Remote Control
The replace is supplied with a radio frequency remote
control. This remote control has a range of approximately
50 ft. (15.25 m), it does not have to be pointed at the re-
place and can pass through most obstacles (including
walls). It is supplied with one of hundreds of independent
frequencies to prevent interference with other units.
!NOTE: Before attempting any operation with the re-
mote, pull the plastic insulator strip out from between
the remote casing and battery cover (Figure 2).
Remote Control Usage
The remote control operates the replace levels sequen-
tially (from off): ames only; to ames and heat.
!NOTE: There is a third level that does not change the
output, before cycling back to ame only.
The level is increased every time the ON button is pressed
on the remote control and the replace can be turned off at
any point by pressing the OFF button.
Remote Control Initialization/Reprogramming
If the remote control or remote control receiver has been
replaced, follow these steps to initialize the remote control
and receiver:
1. Ensure that power is supplied through the main service
panel.
2. Turn On/Off Switch to ON (Figure 1A).
3. Move the 3-position switch to the “ REMOTE ” position
(Figure 1B).
4. Press and hold the Manual Control Button marked “ I”
for ve seconds. After ve seconds, there is a 10 sec-
ond window to press any button on the remote control.
5. Press any button on the remote control within that 10
seconds. This will synchronize the remote control and
receiver.
Battery Replacement
To replace the battery:
1. Slide battery cover open on the remote control (Figure
2).
2. Install one 12-Volt
(A23) battery in the
battery holder.
3. Close the battery
cover.
Battery must be re-
cycled or disposed
of properly. Check
with your Local Authority
or Retailer for recycling
advice in your area.
OPERATION
Figure 1
C B
A
WARNING: This electric rebox must be properly in-
stalled before it is used.
CAUTION: The voltage selector switch needs to be set
to reect the incoming voltage to the unit - 115V or 230V
before operating the unit.
The manual controls for the electric replace are located
on the right side of the unit and inside the air intake slot
(Figure 1).
A. On/Off Switch
The On/Off Switch supplies power to all replace functions.
When the switch is in the “ I” position, the unit is on. When
in the “ O ” position, the replace is off.
B. 3-Position Switch
The 3-position Switch changes the mode the replace oper-
ates in and has three positions: “ MANUAL ”; “ OFF ”; and “
REMOTE ”.
In “ MANUAL ” mode, the replace’s three levels of opera-
tion are controlled by the manual control buttons.
In “ OFF ” mode, power to all functions is cut off.
When in “ REMOTE ” mode, the replace’s levels of op-
eration are controlled by the ON and OFF buttons on the
remote control.
C. Manual Control Buttons
The Manual Control Buttons operate the replace levels.
The level is increased every time the “I” button is pressed
the unit will cycle the levels through sequentially (from off):
ames only; to ames and heat.
!NOTE: There is a third level that does not change the
output, before cycling back to ame only.
The replace can be turned off at any point by pressing the
“ O” button.
!NOTE: The heater may emit a slight, harmless odor
when rst used. This odor is a normal condition caused
by initial heating of internal heater parts and will not occur
again.
Resetting the Temperature Cutoff Switch
Should the heater overheat, an automatic cut out will turn
Figure 2
Off Button
On
Button
Battery
Cover
Plastic
Strip

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MAINTENANCE
 WARNING: Disconnect power and allow heater to cool
before attempting any maintenance or cleaning to reduce
the risk of re, electric shock or damage to persons.
!NOTE: The replace should not be operated with an
accumulation of dust or dirt on or in the unit, as this can
cause a build up of heat and eventual damage. For this
reason the heater must be inspected regularly, depending
upon conditions and at least at yearly intervals.
Partially Reective Glass Cleaning
The partially reective glass is cleaned in the factory dur-
ing the assembly operation. During shipment, installation,
handling, etc., the partially reective glass may collect dust
particles; these can be removed by dusting lightly with a
clean dry cloth.
To remove ngerprints or other marks, the partially reec-
tive glass can be cleaned with a damp cloth. The partially
reective glass should be completely dried with a lint free
cloth to prevent water spots. To prevent scratching, do not
use abrasive cleaners.
Fireplace Surface Cleaning
Use only a damp cloth to clean painted surfaces of the
replace. Do not use abrasive cleaners.
Servicing
Except for installation and cleaning described in this manu-
al, an authorized service representative should perform any
other servicing.

5
EXPLODED PARTS DIAGRAM
REPLACEMENT PARTS LIST
12
6
1
2
3
4
14
10
11
7
8
15
9
1. Element........................2200510700RP
2. Partially Reective Glass Kit ........9600750100RP
3. Blower Assembly.................5300160300RP
4. Front Glass .....................6908730100RP
5. Flicker Motor ....................2000220100RP
6. Flicker Assembly ................5902490100RP
7. Cutout .........................2300201600RP
8. LED Light Panel (3/unit) ...........3000830200RP
(Serial #’s starting with 28113-28313 .3000830100RP)
9. Remote Receiver ................3000821000RP
10. Switch Board.................... 3000821100RP
11. LED Driver Board ................3000810100RP
12. LED Driver Board ................3000810200RP
13. On/Off Switch ...................2800070400RP
14. Voltage Selector Switch ...........2800080100RP
15. Remote Control..................3000370900RP
16. Glass Media ....................1400070100RP
17. Terminal Block...................4000070100RP
18. Mounting Kit ....................9600760100RP
19. 120V Plug Kit ................... BLF-PLUG-KIT
Accessories
Wall Switch Remote Control ..............WRCPF-KIT
OEM Accessory
River Rocks ..............................DFS1314
5
13

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WIRING DIAGRAM
L1
N
L2
4
3
2
6
1
5
RL3
RL2
RL1
N
N
N
L1
120
240
COMM
VOLTAGE SELECTOR SWITCH
BLOWER MOTOR
HEATING ELEMENT
HEATING ELEMENT
FLAME MOTOR
CAPACITOR
LED CONTROL BOARD
LED LIGHTS
LED LIGHTS
LED CONTROL BOARD
THERMAL
CUTOUT
CONTROL PCBL
240 V~ / 60 HZ
Power Supply
(Breaker Panel)
L
CONTROL PCB
THERMAL
CUTOUT
LED CONTROL BOARD
LED LIGHTS
LED LIGHTS
LED CONTROL BOARD
CAPACITOR
FLAME MOTOR
HEATING ELEMENT
HEATING ELEMENT
BLOWER MOTOR
VOLTAGE SELECTOR SWITCH
COMM 240
120
L1
N
N
N
RL1
RL2
RL3
5
1
6
2
3
4
L1
2. For No Heat installations
leave L2 unconnected with
a wire connector on the end
1. Regular installation
attach N and L2 together
3. For installation with a
Heat Disconnect Switch
N
L2
See Options
Below
L2
N
Different Heat Control Options
N
L2 Wall On/Off Switch
Wall On/Off
Switch
L2
Different Heat Control Options
L2
L2
3. For installation with a
Heat Disconnect Switch
1. Regular installation
attach Neutral and L2 to
the panel
2. For No Heat installations
leave L2 unconnected with
a wire connector on the end
See Options
Below
L2
120V Installations
240V Installations

7
PREPARATION FOR SERVICE
!NOTE: All components are replaceable from the front
of the replace while the unit is mounted on the wall, with
the exception of replacement of the power cord.
!NOTE: If the power cord needs replacing or if the unit
needs to be removed from the wall for any other reason
please begin service by following the “PREPARATION
FOR SERVICE” instructions, then move on to the section
“INSTRUCTIONS FOR REMOVING FROM WALL”.
Tools Required: Philips head screwdriver
WARNING: Disconnect power before attempting any
maintenance or cleaning to reduce the risk of electric
shock or damage to persons.
CAUTION: If unit was operating prior to servicing allow
at least 10 minutes for lights and heating elements to cool
off to avoid accidental burning of skin.
1. Disconnect power source.
• Unplug the replace from the outlet.
• If unit has been hardwired for power or outlet is not
accessible from the front, turn the breaker off at the
electrical panel.
2. Remove the front glass assembly by removing the
4 screws (1 on the left and 1 on the right side and 1
on either side of the top front vent opening). These
screws secure the front glass panel to the inside of the
replace. (Figure 4)
3. Lift the front glass assembly off of the 4 mounts located
between the outer and inner casing of the replace: 2
on the left and 2 on the right. (Figure 3) Carefully place
the glass assembly aside in a safe location.
4. Proceed to the instructions within this manual relating
to the repair being performed - see Table of Contents
for page number.
INSTRUCTIONS FOR REMOVING
FROM WALL
WARNING: Disconnect power before attempting any
maintenance or cleaning to reduce the risk of electric
shock or damage to persons.
CAUTION: If unit was operating prior to servicing allow
at least 10 minutes for lights and heating elements to cool
off to avoid accidental burning of skin.
!NOTE: Only required for replacement of the power
cord or removal from service.
CAUTION: Follow “Preparation for Service” instructions
before proceeding.
Mounting - The replace may be mounted in one of 2 meth-
ods:
• Surface Mount
• Flush Mount (completely in the wall)
Identify the type of mounting and follow the appropriate
instructions in the following pages.
CAUTION: Two people will be required for removal
and re-installation of the replace. The unit is approx. 74
5/16”w x 19 1/2”h x 7”d. Weight is approximately 130 lbs.
CAUTION: To prevent injury or damage, turn off the
breaker in your electrical panel prior to attempting to re-
move this unit off the wall.
!NOTE: If replace is hard wired directly to the electri-
cal panel, and there is not enough slack in the wires within
the wall to reach your work area, remove the electrical junc-
tion box cover located on the bottom right by removing the
1 screw on the front of the cover. Lift the cover off and set
aside. Disconnect the 3 wire connectors connected to the
power source, taking note of their original conguration.
Surface Mount
(Figure 6)
Tools Required: Philips head screwdriver
CAUTION: Follow “Preparation for Service” instructions
before proceeding.
1. Remove the decorative glass ember-bed pieces from
the media tray, which lies along the bottom of the
interior Partially Reective Glass. A medium sized
container such as a bucket or a box will be needed to
keep the glass ember-bed pieces together.
2. On the bottom of the unit remove the securing screw
from the L-bracket. (Figure 5)
3. With one person on either end of the unit lift the unit up
and off of the wall.
4. Carefully lay the unit down on a solid at surface with
the front of the unit facing up.
!NOTE: If the surface you are using as a work area on
is a nished surface that is prone to scratches (i.e. hard-
Figure 4 Tab
Figure 3
Hooks (4)
Mounts (4)

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wood ooring), it is recommended that a protective barrier
be used underneath, (i.e. cloth, cardboard, thick plastic).
5. Proceed to the instructions within this manual relating
to the repair being performed - see Table of Contents
for page number.
6. Once repair is complete, reassemble in the reverse
order as above.
Flush Mount – Complete In-wall
(Figure 7)
Tools Required: Philips head screwdriver
CAUTION: Follow “Preparation for Service” instructions
before proceeding.
1. Remove the decorative glass ember-bed pieces from
the media tray, which lies along the bottom of the
interior Partially Reective Glass. A medium sized
container such as a bucket or a box will be needed to
keep the glass ember-bed pieces together.
2. Locate and remove the 4 mounting screws inside the
unit located on left and right side towards the front.
There are 2 screws per side, going from the side
panels out into the side of the wall stud that frames the
replace. (Figure 7)
CAUTION: The unit should be supported while remov-
ing the screws to prevent the unit from falling.
3. Remove the replace out of the opening by slightly lift-
ing and pulling forward.
4. Carefully lay the unit down on a solid at surface with
the front of the unit facing up.
!NOTE: If the surface you are using as a work area is
a nished surface that is prone to scratches (i.e. hardwood
ooring), it is recommended that a protective barrier be
used underneath, (i.e. cloth, cardboard, thick plastic).
5. Proceed to the instructions within this manual relating
to the repair being performed - see Table of Contents
for page number.
6. Once repair is complete, reassemble in the reverse
order as above.
ON/OFF SWITCH REPLACEMENT
WARNING: Disconnect power before attempting any
maintenance or cleaning to reduce the risk of electric
shock or damage to persons.
CAUTION: If unit was operating prior to servicing allow
at least 10 minutes for lights and heating elements to cool
off to avoid accidental burning of skin.
Tools required: Phillips head screwdriver.
Needle nosed pliers.
CAUTION: Follow “Preparation for Service” instructions
before proceeding.
1. Remove the 2 screws, that secure the controls assem-
bly (Figure 8), located at the top of the mirror on the
right side of the unit.
Wall Surface
Mounting Hole
Figure 7
Figure 5
Figure 6

9
2. Slide the controls assembly out toward the front of the
unit.
CAUTION: Ensure that the assembly is removed care-
fully, ensuring that no wires are caught or over strained.
3. Using needle nose pliers, pinch the tabs on either side
of the switch to release and push the switch up and out
of the opening.
!NOTE: Note the orientation of the switch prior to re-
moving.
4. Locate the On/Off Switch (Figure 9).
5. Disconnect the wiring connections noting their original
locations.
!NOTE: Using a at head screwdriver gently pry be-
tween the end of the connectors and the switch to release
the wires.
6. Reconnect wires onto the prongs on the switch in their
original conguration.
7. Insert the new switch by pushing switch back through
the hole past the side tabs on the switch, securing it in
the opening.
8. Reassemble in the reverse order as above.
REMOTE SWITCHBOARD
REPLACEMENT
WARNING: Disconnect power before attempting any
maintenance or cleaning to reduce the risk of electric
shock or damage to persons.
CAUTION: If unit was operating prior to servicing allow
at least 10 minutes for lights and heating elements to cool
off to avoid accidental burning of skin.
Tools required: Phillips head screwdriver.
Needle nosed pliers
Wire snips
CAUTION: Follow “Preparation for Service” instructions
before proceeding.
1. Remove the 2 screws, that secure the controls assem-
bly (Figure 8), located at the top of the mirror on the
right side of the unit.
2. Slide the controls assembly out toward the front of the
unit.
CAUTION: Ensure that the assembly is removed care-
fully, ensuring that no wires are caught or over strained.
3. Locate the switchboard (Figure 9).
4. Disconnect the wiring harness from the switchboard.
5. To remove the switchboard off of the plastic mounting
tabs, pinch the plastic mounting tabs with needle nose
pliers. Pull the old board off.
!NOTE: If the location of the unit does not allow for the
tabs to be easily manipulated, the top portion of the mount-
ing tabs can be cut off (replacement ones are provided with
the replacement switchboard).
6. Line up the holes on the switchboard and gently press
the new board onto the mounts. Make sure the board
is secure.
7. Reconnect the wire harness onto the back of the
switchboard in its original conguration. .
8. Reassemble in the reverse order as above.
REMOTE CONTROL RECEIVER
REPLACEMENT
WARNING: Disconnect power before attempting any
maintenance or cleaning to reduce the risk of electric
shock or damage to persons.
CAUTION: If unit was operating prior to servicing allow
at least 10 minutes for lights and heating elements to cool
off to avoid accidental burning of skin.
Tools required: Phillips head screwdriver.
Needle nosed pliers.
Wire snips
CAUTION: Follow “Preparation for Service” instructions
before proceeding.
1. Remove the 2 screws, that secure the controls assem-
bly (Figure 8), located at the top of the mirror on the
right side of the unit.
Figure 8
Figure 9
Retaining Screws
Remote
Receiver
12 LED
Driver Board
6 LED
Driver Board
Voltage
Selector
Switch
Switch
Board
On/Off
Switch
Controls Assembly

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2. Slide the controls assembly out toward the front of the
unit.
CAUTION: Ensure that the assembly is removed care-
fully, ensuring that no wires are caught or over strained.
3. Locate the remote control receiver (Figure 9).
4. Transfer the wiring connections from the existing re-
ceiver to the new receiver.
!NOTE: Using a at head screwdriver gently pry be-
tween the end of the connectors and the board to release
the wires.
5. Remove the remote control receiver off the plastic
mounts by pinching the plastic mounting tabs with
needle nose pliers. Pull the old board off.
6. Line up the holes on the receiver and gently press the
new board onto the mounts. Make sure the board is
secure.
7. Reassemble in the reverse order as above.
CAUTION: When re-installing, be sure the wires are
guided and tucked into the proper openings along the right
side so they are not pinched and allows enough space to
reinstall the panel.
LED DRIVER BOARD
REPLACEMENT
WARNING: Disconnect power before attempting any
maintenance or cleaning to reduce the risk of electric
shock or damage to persons.
CAUTION: If unit was operating prior to servicing allow
at least 10 minutes for lights and heating elements to cool
off to avoid accidental burning of skin.
Tools required: Phillips head screwdriver
Needle nosed pliers
Wire snips
CAUTION: Follow “Preparation for Service” instructions
before proceeding.
1. Remove the 2 screws, that secure the controls assem-
bly (Figure 8), located at the top of the mirror on the
right side of the unit.
2. Slide the controls assembly out toward the front of the
unit.
CAUTION: Ensure that the assembly is removed care-
fully, ensuring that no wires are caught or over strained.
3. Locate the defective LED driver board (Figure 9).
4. Transfer the wiring connections from the existing driver
board to the new driver board.
!NOTE: Using a at head screwdriver gently pry be-
tween the end of the connectors and the board to release
the wires.
5. Remove the LED driver board off the plastic mounts
by pinching the plastic mounting tabs with needle nose
pliers. Pull the old board off.
6. Line up the holes on the driver board and gently press
the new board onto the mounts. Make sure the board
is secure.
7. Reassemble in the reverse order as above.
CAUTION: When re-installing, be sure the wires are
guided and tucked into the proper openings along the right
side so they are not pinched and allows enough space to
reinstall the panel.
VOLTAGE SELECTOR SWITCH
REPLACEMENT
WARNING: Disconnect power before attempting any
maintenance or cleaning to reduce the risk of electric
shock or damage to persons.
CAUTION: If unit was operating prior to servicing allow
at least 10 minutes for lights and heating elements to cool
off to avoid accidental burning of skin.
Tools Required: Philips head screwdriver
Flat head screwdriver
Wire cutters/strippers
Needle nose pliers
CAUTION: Follow “Preparation for Service” instructions
before proceeding.
1. Remove the 2 screws, that secure the controls assem-
bly (Figure 8), located at the top of the mirror on the
right side of the unit.
2. Slide the controls assembly out toward the front of the
unit.
CAUTION: Ensure that the assembly is removed care-
fully, ensuring that no wires are caught or over strained.
3. Locate the voltage selector switch (Figure 9).
4. Remove the voltage selector wire connections from the
switch noting their original locations.
!NOTE: Using a at head screwdriver gently pry be-
tween the end of the connector and the switch to release
the wires.
5. Depress the retainer clips on the rear of the voltage
selector switch and push the switch out of the front of
the panel.
6. Properly orient and reinstall the new switch.
7. Reconnect all of the wiring connections.
8. Reassemble in the reverse order as above.
CAUTION: When re-installing, be sure the wires are
guided and tucked into the proper openings along the right
side so they are not pinched and allows enough space to
reinstall the panel.