SweetHome SH450 Operating instructions

SweetHome Pellet Grill
Repair Manual
Models SH450 & SH650
FORWARD
This manual is intended for use by technician properly
trained to service and repair electrical appliances.
Discussions including the use of electric multi-m eters,
Ohm meters, and general electric trouble shooting will
not be included. Please refer to general repair hand
books for these instructions.
WARNING - ELECTRIC SHOCK POTENTIAL
All repairs must be accomplished with the
120VAC power disconnected from grill.
PRODUCT DESCRIPTION
The SweetHom e Pellet Grill consists of a m ain cabinet
(body), base assem bly with legs, hood assembly, and
hopper assem bly. Construction is form ed and welded
galv. steel providing long life. Both interior and exterior
finishes are high tem perature metallic black.
By design m ost key electric components are housed in
the hopper assem bly. The three com ponents for service
consideration in the m ain chassis is the igniter, fan
motor, and thermo-sensor. For this reason the m anual
will divide repairs into four sections.
TOOLS & SERVICE KIT
The tools and equipm ent needed for servicing the
SweetHom e Pellet Grill are as follows:
a. Good shop vacuum with blower capabilities.
b. Set of socket drivers which must include 11/32,
1/2 & 7/16 sockets or nut drivers.
c. Phillips and plastic coated slot screw drivers
d. Flashlight
e. Extension cord with ground
f. Allen wrench set (long handle)
g. W ire stripper and cutter
h. Electrical continuity tester with light or LED
i. Assorted crimp connectors with crim p tool
j. Digital read out volt multi m eter
The SweetHom e Service Kit P/N 11222 includes:
a. Fan Motor, Feed Motor
b. Main Circuit Board
c. Main Power Switch
d. Igniter
e. Three (3) (5A) Main fuses
f. Therm o-Sensor
h. EPROM - Operating Software Chip
GENERAL TROUBLESHOOTING
The following flow charts will assist in identifying basic
diagnosis and repairs.
SweetHome SH450SS

GENERAL TESTING PROCEDURES
Grill operation and function is provided by the m ain
control based on a m icroprocessor containing the
operating instruction or program . In general the testing of
the controller is functional along with basic output
electrical testing. Field repair of the controller is not
practical and best accom plished by factory.
To assist the technician in general trouble shooting the
controller has a “test” function which displays the current
thermo-sensor temperature along with the target
tem perature. This function is reached by PRESSING
BOTH THE UP AND DOW N BUTTONS AND HOLDING
FOR 5 SECONDS. You will not be able to change
display output back and forth. A standard display will be
restored when cycling the m ain power off.
Once in the test display m ode, the inform ation provided
by direct read therm o-sensor tem perature will be
valuable. The following is a summ ary of testing m ethods
and corrective actions:
CONTROL FUNCTION TESTING
1) Turn m ain power ON.
Initial display - Model designation - (450) or (650)
*Confirms proper EPROM (computer chip) model
programming. If model is incorrect replace EPROM.
* Display should provide three lighted characters and
three dots under the characters. Damaged display
would have missing or fragmented characters.
2) Control set to Test Function displays dual tem p.
* Display both target temp. 325° and actual sensor
temp. based on cabinet and surrounding air.
* Confirmation of control and software status including
thermo-sensor.
3) Therm o-Sensor Input test can be accom plished with
a com mon heat source held under sensor hood.
* Once test function displays add heat under sensor
hood and confirm displayed temperature increase.
* CAUTION - Do not overheat sensor with direct
flame.
4) A Complete System Test Run can be achieved by
Therm o-Sensor heating.
* To confirm a complete system test run, remove all
fuel from hopper, remove grills, tray, flame baffle,
and burn tray.
* Turn main power ON, advance to Test Function
display. Press ON button.
* Confirm feed start, fan start, and igniter start. All
these functions begin immediately with the igniter
taking several minutes to reach full heat.
* Carefully apply heat to sensor confirming rise on
display through 330°.
* Maintain heat above 330° for several minutes to
confirm “Run Mode” is achieved by flashing display
and three beeps from controller. Fan speed will
change, feeds will change, and you can reduce
target temperature to 230°.
* Once target temperature is reduced remove heat
from sensor area and confirm slowly falling sensor
temperatures.
* Once temperature falls below 140° or falls rapidly
enough the CoL mode will be displayed. Feed will
stop, igniter off, and fan speed increased to clean
burn tray.
This com pletes the system test. At any point a failure is
noted regarding fan m otor, feed motor, or igniter
operations refer to the Flow Charts for further testing.
-2-

IF THE CONTROL PASSES 325° AND DOES NOT
ADVANCE TO RUN MODE WHICH IS CONFIRMED BY
FLASHING DISPLAY AND THREE BEEPS PLUS THE
ABILITY TO CHANGE TARGET TEMPERATURE -
THIS INDICATES A THERMO-SENSOR PROBLEM.
TESTING AND POSSIBLE REPLACEMENT OF
SENSOR IS BEST TROUBLE SHOOTING
PROCEDURE.
TESTING & SERVICING THERM O-SENSOR
The thermo-sensor is located on the left side interior of
the chassis. It is protected by a steel hood and is
designed for standard grill operations. The sensor does
not require regular service except to confirm it is free
from cooking debris.
It m ay be possible however to dam age the sensor if
some item is pushed through the hood access or is hit
hard enough to displace the lead end. Testing of ths
sensor is therefore as important as the main control test.
Outline of the basic control test will provide general
operation of the sensor and feed back to the controller. If
the sensor operation warrants further evaluation
complete the following tests:
1) Check sensor physical dam age or debris in hood or
hood vent hole.
* Clean with air or soft brushing action to remove
build up. Care should be taken not to bend or
damage lead end.
2) Check sensor lead attachm ent to the controller by
accessing m ain control through front panel.
* Confirm the screws that hold the leads are tight.
Care should be taken not to over tighten as the
base is made of plastic.
* Loose attachm ent could cause erratic sensor reads
by controller.
* Leads have specific polarity and must be attached to
the proper lug. Refer to the colors noted on the
board base, RED & YELLOW .
* Reversing the polarity will cause the grill to read a
reducing temperature when the actual tem perature is
increasing. The operating result is to start the grill
and a run of less than 5 m inutes with a CoL shut
down.
3) Sensor Grounding to Chassis causing control
function problem s and m issed starts.
* The sensor leads should not come in contact with
the chassis to a cause a ground condition. This will
cause the controller to act erratic.
* Starts that continue beyond the 325° target without
run m ode initiation and erratic shut downs leading to
fast CoL cycles are directly caused by grounded
sensors.
* Testing for grounding requires the sensor leads to be
disconnected from the controller and a OHM m eter
applied to chassis and one sensor lead. If continuity
is found the sensor is grounded and should be
rem oved for inspection and possible replacem ent.
TESTING & SERVICE AUGER, FAN, AND IGNITER
Test procedures for these com ponents are significantly
the sam e as they are basic 115VAC loads. Each
component can be rem oved for electric testing and or
tested in place. The following is an item specific
description:
Thermo-sensor Assembly
Thermo-sensor lead placem ent
Thermo-Sensor - Located left inside base
-3-

AUGER SYSTEM
Most auger complaints are jam related. Pellets left in the
auger system may expand with m oisture and as the unit
cools tightening on the auger system . To confirm auger
jam rem ove fuel from hopper. Loosen auger cover plate
with (4) 3/8 nuts. Many cases this will allow the jam to
clear when START button is pressed.
Additionally, a jam
may occur in the
output shoot located
inside the unit
chassis and is
access by removing
the heat shields.
This can be
confirm ed with a
mirror and flash light
or by using a long
screw driver to press
into the jam .
Generally, this type
of jam is caused by
a foreign object or build up from oily fuel. Clean this area
with a thinner and let dry.
If the auger system service requires removing it from the
hopper, this is best accom plished with the grill resting on
it’s back. Accessing the
hopper bottom and
inspection of feed shoot
is easier.
Rem oving the auger
motor assembly
requires loosening (4)
3/8 nuts holding the
motor bracket to the
hopper. Disconnect the
(2) wire nuts from m otor
lead and carefully
rem ove the white plastic
fan blade by pulling on
the hub.
Once the nuts, wire nuts, and fan blade is removed
carefully pull the auger from the housing. Som e trapped
fuel and saw dust will follow the auger. Once rem oved
inspect the auger for damage and proper assembly
including the thrust washer and support bushing.
The auger motor gear box should not allow the auger to
turn as the ratio is very high. To test the assem bly
connect to 115VAC allowing the m otor to drive the auger.
The gear box should turn without skipping or excessive
noise (Som e gear noise is com mon).
Removing the auger
from the m otor drive
shaft requires 1/8" allen
Tee W rench to loosen
and rem ove both set
screws. Separate the
shaft from the m otor
drive. Inspect the
bushing for excessive
wear and the shaft for
damage.
Assembly of auger
shaft to m otor is
accom plished by
holding the auger
and applying
pressure to load the
thrust washer
against the bushing.
(Shaft collar and
thrust washer m ust
contact the bushing
to transfer load to
bushing, not to gear
box!)
Installation of feed assembly m ay require a new feed
motor gasket. If gasket is not torn it may be reused.
W hen replacing gasket use high tem perature silicone on
hopper side only.
Feed System view ed from hopper bottom.
Auger access cover viewed
from inside hopper.
Feed motor & gear box
attachm ent to bracket.
Motor bushing installation.
Thrust washer assembly.
Tightening allen sets.
-4-

Igniter and igniter blast tube.
Igniter Tube Assembly.
Igniter blast tube installation with base rem oved.
Removing/installing blade.
IGNITER SYSTEM
Igniter system testing may be accom plished by method
noted in flow chart. Rem oval of igniter from blast tube
require disconnection of wires and 3/4" wrench to
unscrew igniter.
If com plete blast tube m ust be removed or replace the
leg base will require rem oving the (4) 1/4-20 bolts
located in the bottom of the chassis. Rem ove the blast
tube with 7/16" wrench.
FAN SYSTEM
The fan is mounted on a base plate which is inserted into
the bottom of box. Rem ove the (4) #8 phillips screws
from the rear of the
fan housing.
Rem oving the ash
dum p plate. This
allows the fan and
base plate to be
rem oved from the
bottom of the box.
(Care should be
taken to not bend
the fan blades when
rem oving or
installing the m otor
and plate assembly.
Slightly bent blades
can be repositioned
by carefully bending
prior to installation.)
The blade is held
into position by an
allen set screw.
Hub is facing the
motor m ount.
For additional assistance, contact technical service -
[e-mail]
Customer Service & Replacement Parts
Replacem ent parts are available from your local dealer
or on-line @ www.sierraproductsinc.net . or call or write:
Customer Service
Sierra Products, Inc.
5061 Brooks St. Ste. B,
Montclair, CA 91763
Phone [phone]
Fax [phone]
www.sierraproductsinc.net

SweetHome Parts List - SH450
Description Qty Part No. Description Qty Part No.
Rating / Serial Num ber Label 1 140838 Drip Pan Support Angles 1 202371
Ops Safety Label 1 140837 Drip Rail 1 202348
Front Legs 2 202375 Feed Chute Heat Btm 1 202384
Front W heels 7" 2 110173 Feed Chute Heat Top 1 202383
Rear Legs 2 202374 Flam e Baffle 1 202370
Rear W heels (Caster W heel with Stud) 2 110184 Heat Shield 1 202387
Grease Drip Pan 1 202347 Heat Shield Front / Rear Sh450 2 202420
Cooking Grid 1 202246 Side Shelf- sh 1 202376
Heat Shield Front / Rear Sh 450 2 202420 Shelf Brackets 2 202377
Skirt Base Front / Rear 2 202372 1/4-20 X 1/2 Ss Phil Pan hd 8 130048
Skirt Base Side 2 202373 1/4-20 Tee Nuts 4 130027
Grease Bucket - 4" Galv. 1 110553 1/4-20 Ss Nut 4 130148
W ire Terminal 8 110077 Hopper Box Surrand 1 202360
Rocker Switch, 10am p 1 110343 Hopper Front / Rear 1 202361
Cord, 18ga - 3 W ire 6' with Grounded Plug 1 110041 Hopper Bottom 1 202362
Strain Relief 1 110352 Hopper Box Cover 1 202379
Twist-on W ire Connector Blk 8 110558 Control Panel Graphic Plate 1 170130
.187 Fem ale Term inal 4 110077 Controller 1 120143
Ring Tongue Term inal 1 110430 8-32 X 1/2 Ss Phl Pan Hd SS 12 130154
6-32 X 1/2 Phil Pan Head, Zinc Plated 1 130021 Burnplate Mtn Support 1 202355
6-32 Nut, Zinc Plated 1 130020 Burnplate Mtn Front 1 202356
W ire-blk- 18ga Stranded, Ul1007/1569 36 110350 Burn Pot Support Angle 1 202390
W ire-wht- 18ga Stranded, Ul1007/1569 36 110350 Burn Pot Inside 1 202357
4/40 Alum Stand off 4 110523 Fan Motor..110 V, 60 Hz Motor 1 410052
4-40 X 1/4 Pan Phil type F ss 4 130156 Fan Motor Mtn Plate 1 202359
4/40 Nut Zinc Plated 4 130140 #8-32 X 5/16 Phil Typ 1 Blk 6 130006
Chassis Lid / Cover 1 202352 Feed Bracket 1 202368
Zinc-pltd Stl Pan Head Phillips Screw 2 130163 Sbr Rubber Grom met 1/4" 4 110518
Sweet Home Hood Spacer 2 110564 1/4" Brass Grom m et 4 110517
Sweet Home Em blem (Logo) 1 110565 Feed Mount Holding Parts 1 202365
Hood / Lid Side Panels 2 202351 #10-24 W eld Stud 8 130028
Lid Handle Spacer (1/2 - 3/8 X 2" s 2 110219 1/4-20 Ss Nut - 4 130148
Plastic Push Cap for Handle Rod 2 110217 10-32 X 3/4 Zinc Ph Pan hd 4 130155
10-24 X 2 1/2 Pan Hd Phil, Zinc, Handle 2 130149 #8-32 X 5/16 Phil Typ 1 Blk 2 130006
10-24 Nut Insert Steel 2 130150 Feed Motor Gasket 1 110545
Lower Chassis Panel 1 202345 Feed Motor..120 Volt, 60hz, .6a 1 110555
Chassis Side Panel rt 1 202343 F Pitch 10 1 110548
Chassis Side Panel lt 1 202344 Auger Shaft 1 110525
10-24 W ing Nut, Zinc Plated 5 130024 Igniter 1 120142
#10-24 X 5/16 W eld Stud, 90° Stl Plain 3 130028 Igniter Holding Pipe 1 202358
1/4 - 20 X 2" Phil Pan Head Screws - Skirt 12 130082 Blast Tube Mnt Tab 1 202389
1/4-20 Ss Nut 12 130148
1/4-20 Ss Nut 4 130148
Grill Back 1 202346
Sierra Products, Inc. 5061 Brooks St. Ste. B, Montclair, CA 91763
P/N 140857 04/11

Figure 1 - Main control board
Figure 2 - Removing software
SweetHome Software Upgrade
2011 Model SH450A/650A
General Information
From tim e to time, new operating software is updated for
the SweetHom e Pellet Grills. The software is
perm anently burned onto a com puter ROM m em ory chip.
Changing the software is easily accom plished with
comm on tools provided care is taken not bend any “legs”
during the installation.
Installation of this software should be accom plished by a
technician fam iliar with electronic and mechanical
equipm ent. This installation does not require changing
any high voltage connections.
WARNING - ELECTRIC SHOCK POTENTIAL
All repairs must be accomplished with the
120VAC power disconnected from grill.
INCLUDED IN THIS KIT:
Qty P/N Description
1 11223 Sweethom e Software V2<
1 140841 Installation m anual
Rem oval of old software
1) Disconnect all power to grill.
2) Rem ove control (3) phillips access panel located
on lower left side of the hopper leaving the lower
left screw loose and in-place to hold the panel.
3) Find software chip on lower left side of board
(Figure 1). Note label direction and position of
sm all dot in upper corner and half round cut.
4) Using sm all flat blade screw driver carefully insert
under chip between base. Lift chip a sm all amount
then go to other side and com plete same (Figure
2). Continue until chip is free of socket base.
Installation of new software
1) Carefully layout new software noting the label
direction and sm all dot on upper right corner
(Figure 2). Confirm software is for proper m odel by
locating the m odel on the label.
Models SH450 and SH650 have individual operating
software. Correct software for the m odel must be
used for safe operation.
2) Starting at the lower row of pins, carefully align
each pin into top of socket.
3) Apply slight pressure down on chip and align top
row of pins into socket (Note: Pin placement is
important for proper stove operation).
4) W ith all pins carefully aligned with socket, push
slightly on each side of chip slowly working into
socket. Make sure you support the circuit board
with your other hand so it does not bend.
5) After chip is seated into socket confirm no pins
have been bent and all pins are firm ly into socket.
6) Re-attach control access panel with phillips screws.
Apply power and confirm tem perature read out.
For additional assistance, contact technical service -
csepi@ sierraproductsinc.net
Customer Service & Replacement Parts
Replacem ent parts are available from your local dealer or
on-line @ www.sierraproductsinc.net . or call or write:
Customer Service
Sierra Products, Inc.
5061 Brooks St. Ste. B,
Montclair, CA 91763
Phone [phone]
Fax [phone]
www.sierraproductsinc.net
Sierra Products, Inc. 5061 Brooks St. Ste. B, Montclair, CA 91763
P/N 140841r2 10/10