Serfas DASH 350W User manual

OWNER’S MANUAL
DASH 350W E-BIKE
DASH 500W E-BIKE
www.serfas.com

SERFAS DASH 350W / DASH 500W
OWNER’S MANUAL
Thank you for purchasing a Serfas Dash 350W/500W e-bike! Before riding, please take a
moment to review these instructions.
Need service or support? Visit our website for quick answers, manuals, and/or give us
a call and we’ll find you a solution.
Dash 350W/500W
Step-Over Frame
Dash 350W/500W
Step-Through Frame
Serfas, Inc
2333 W Utopia Rd
Phoenix, AZ 85027
Phone: [phone]
Email: [email protected]

CONTENTS
9
Warranty Information 9

DISPLAY / CONTROL SPECIFICATIONS
• 36 Volt Power Supply (350W)
• 48 Volt Power Supply (500W)
• Current Rated: 10mA
• Maximum Operating Current: 30mA
• Power O Leakage Current < 1uA
• Operating Current to Controller: 50mA
• Operating Temperature: -18º to 65ºC
• Storage Temperature: -30º to 80ºC
Figure 2
M
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SERFAS E-BIKE
Figure 1
POWER SWITCH
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Figure 3
CHARGING PORT
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GETTING STARTED
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SERFAS E-BIKE OWNER’S MANUAL
The Dash 350W/500W is operated using the control pad on the
handlebars. The control pad is located near the left-hand brake lever.
First, push the power button on the battery to turn on (Fig.1) The
current charge level will be temporarily displayed on the LEDs (4=full,
1=near empty), then one green LED to show the battery is turned on.
Next, press and hold the button on the handlebar controls to turn
on the display (Fig. 2) Display should light up. Now, your e-bike is ready
to ride. To turn o, press and hold for 3 seconds. The battery will
automatically turn o.
The Dash 350W/500W bike oers pedal assist. When using pedal
assist, an electric motor supplements the rider’s own eort. To use the
pedal assist, simply start pedaling, then push the arrow to increase
assist or arrow to decrease pedal assist (Fig.2). 0 is the lowest 5 is
the maximum. Pedal assist will engage at speeds up to 28 MPH (Dash
500) or 20 MPH (Dash 350).
The Dash 350W/500W e-bike is equipped with a throttle, which is
mounted near the rider’s left thumb, to propel the bike without
pedaling. To use the throttle, start pedaling (one pedal revolution)
then push down on the throttle while pedaling. Once the bike is
moving on throttle power, you can stop pedaling entirely and use
your thumb to control the speed of the bike. The throttle can propel
you at speeds up to 20 MPH.
THE MOTOR STOPS WHEN YOU:
1) Stop pedaling 2) Squeeze the brake levers 3) Release the throttle.
Simply begin pedaling again to re-engage the motor.

WHAT’S ON THE DISPLAY
SPEED INDICATOR
(Current / Max / Average)
5 LEVELS OF ASSIST
(0: No Assist. 5: Max Assist)
WALK MODE
DISTANCE INDICATOR
(Current Trip / System Mileage)
ERROR CODE INDICATOR
(In the Event of a Problem)
BACKLIGHT INDICATOR
BATTERY LEVEL INDICATOR
(Current / Max / Average)
VOLTAGE OUTPUT INDICATOR
(Real-Time)
SERFAS E-BIKE
While you are riding, you can use the display to monitor your
speed, the amount of pedal assist, battery life remaining, and
other data.
As shown below, your Dash 350W/500W uses an LCD display
screen that looks like this:

USING THE CONTROLS
SERFAS E-BIKE OWNER’S MANUAL
START UP: To turn on your bike, push the power switch on the battery
(Fig.1), then press and hold the button for 3 seconds (Fig.2).
To turn o, press and hold the button for 3 seconds (Fig.2), then
press and hold the power button on the battery for 2 seconds. The
display and battery have an energy-saving feature, if there is no activity
for 10 minutes, they will turn o automatically to preserve battery life.
Push the or arrows to change the level of pedal assist (Fig.2).
Hold and for 3 seconds to switch between showing real-time
speed, average speed, and max speed (Fig.2).
Push to toggle between the display of the Odometer, Trip Distance,
Voltage, and Elapsed Time.
BACKLIGHT: Press and hold for 3 seconds to enable the backlight
on the display. Press and hold again for 4 seconds to turn it o
(Fig.2).
WALK MODE: To enable walk mode, first come to a complete stop and
stand next to the bike. Press and hold 3 seconds. The bike will
slowly move forward at 3.5 MPH / 6 KPH as long as you hold the
button. This feature is useful for pushing the bike up a hill or walkng
through a crowd, where you cannot safely ride.
“Super walk mode” is an even faster version of walk mode. To use it,
hold down the arrow to engage standard walk mode, then press the
throttle. This is useful on very steep climbs or when towing a trailer. Use
caution with both walk modes.

CUSTOMIZING THE DISPLAY
5SERFAS E-BIKE
FUNCTION 01P - BACKLIGHT BRIGHTNESS
You can control how bright you’d like the display backlight
to be. 1 being the dimmest and 3 being the brightest.
FUNCTION 02P - UNIT OF MEASURE
You can toggle between miles or kilometers, based on
your location and preference.
FUNCTION 06P - ODOMETER RESET
The odometer tracks distance ridden over the lifetime of
your bicycle. Press and hold for 5 seconds to reset the
trip distance from a single trip.
You can use the settings features of the display to customize the
Dash 350W/500W for your use. To enter the “Settings” mode, hold
the and buttons at the same time for 2 seconds.
You can customize 3 out of the 6 dierent functions on the display.
Push the button to move from function to function, and use
the and arrows to adjust each to your preference. When you
are finished, press and hold the button to save your changes.
Note: The system will save your changes automatically after 8 seconds.

BATTERY AND CHARGING
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SERFAS E-BIKE OWNER’S MANUAL
The Dash 350W/500W uses a Lithium-Ion battery which can be charged
on or o the bike. We recommend charging the battery o the bike
indoors, in moderate temperature conditions. To charge the battery,
plug the charger into the charging port and then connect the charger to
a wall outlet (Fig.3). The LED indicator light will be red when charging
and will turn green when charging is complete. When finished, unplug
the charger from the battery and from the wall outlet.
Take care of the battery to ensure a long service life.
To optimize the performance of the battery over time, try and use it
(discharging and charging) at least monthly. But if you won’t be riding
your Dash 350W/500W for an extended period of time, it’s best to store
the battery fully charged. EVERY 2 MONTHS: Put battery on the
charger to maintain optimum level.
After many charging and discharge cycles, runtime and range will be
reduced. Replacement batteries are available from Serfas to extend the
life of your e-bike. The lifespan of the battery is about 500 charge /
discharge cycles for properly maintained batteries.
When you install the baterry on the Dash 350W/500W, it locks into place
automatically. To unlock for removal, use the supplied key.
DO NOT ride the bicycle if the battery rattles or moves - it should be
firmly attached.
The Dash 350W/500W battery contains a USB port for transmitting
diagnostic data only, not for charging. It will not charge or power devices
via USB.
• Charge and store the battery indoors if possible. The battery
can be removed from the bicycle for this purpose.
• Avoid extreme hot and cold temperatures.
• DO NOT submerge your bike or any of the components in water.
This action will void the warranty.

MAINTENANCE AND SERVICE
SERFAS E-BIKE
• When cleaning your bike, use a damp cloth and gentle dish soap.
NOTE: DO NOT use a pressure washer or sprayer.
• Periodically apply a light lubricant to moving parts, including the
links of the chain, derailleur pivots, and shifter cable inner wire
where it enters the cable housing.
• If you ride in wet / humid environments, clean and dry electric
connections and apply an anti-corrosive.
• Keep tires inflated to their recommend pressure (30-50 PSI /
2.0-3.5 BAR / 200-350 KPA) and check weekly.
• Clean the drivetrain and lubricate the chain (monthly).
All bicycles will need a periodic tune-up or adjustments by a professional.
An annual “check-up” is beneficial. Your bike’s service schedule will
depend on the frequency of its use. In-between expert services at a bike
shop we suggest:

STORING YOUR BIKE
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SERFAS E-BIKE OWNER’S MANUAL
From time to time, you may wish to store your bike for an extended
period without riding. Proper storage can help prolong the life of your
e-bike components and battery.
To ready your bike for storage, first fully charge the battery. Then
remove the battery from the bike and store it separately. Removing the
battery from the bike puts it into a low-voltage state designed for long
term storage.
Keep both the bike ad the battery in a cool, dry place. Avoid both very
hot and very cold temperatures. Generally if the environment is
comfortable for humans, then it’s a good place to store your bike.
Store your bike away from sources of heat, UV light, and ozone - all of
which can prematurely age rubber tires and tubes.
All bicycle tubes slowly lose air over time and need to be regularly
topped o to maintain proper pressure. This does not mean that your
bicycle has a flat tire. Avoid allowing the tires to deflate completely
during storage.

SAFETY
9SERFAS E-BIKE
You should wear an approved e-bike bicycle helmet every time you
ride, regardless of legal requirement to do so. Additionally, some
jurisdictions require helmet use when riding Class II and Class III
e-bikes like the Dash 350W and Dash 500W.
Your Dash 350W/500W comes with reflectors and we encourage you
to use them. Reflectors are not a substitute for lights, which are not
included with your e-bike. You should purchase, install, and use front
and rear facing lights when riding in low light or dark conditions.
Some jurisdictions restrict where e-bikes can and cannot be ridden.
These limits may include specific speeds and motor wattages.
Your Dash 350W is a Class II e-bike, 350 Watts with pedal assist up to
20 MPH and throttle up to 20 MPH. You should only ride it where legal
and safe.
Your Dash 500W is a Class III e-bike, 500 Watts with pedal assist up to
28 MPH and throttle up to 20 MPH.
Some jurisdictions do not allow throttle controlled e-bikes. Your Dash
350W/500W will still run without the throttle plugged in and removed
from the bicycle.

ERROR CODES AND TROUBLESHOOTING
CODE ERROR HOW TO RESOLVE
21 Current
Error
Check the cable that connects the
rear hub motor to the rest of the
system. Make sure it is free from grit or
contaminants and is firmly connected.
22 Throttle
Error
When you press and release the throttle,
it should return to the original position.
Remove any obstructions. Check the
throttle and throttle cable for damage,
such as a cut or frayed cable.
23 Motor Phase
Error
Check the cable that connects the rear
hub motor to the rest of the system
and make sure it is free from grit or
contaminants and is firmly connected.
This error might appear if you don’t
reconnect the cable after removing the
rear wheel (for example, after changing
a flat tire, or transporting your bike in the
trunk of a car). At least one of the motor
phase wires has been damaged or is
temporarily disconnected.
24 Motor Hall Sensor
Error
The hall sensor inside the rear hub might
be disconnected or damaged. Service or
replace the rear hub.
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SERFAS E-BIKE OWNER’S MANUAL
In the event of a problem with the electrical components of your
bike, the display will show an error code. Compare the code with
this list below and HOW TO RESOLVE:

25 Brake
Error
The Dash 350W/500W uses special brake
levers that stop the motor when you apply
the brakes - built in “magnetic reed
swtiches” disengage the motor’s power
when the lever is squeezed. If the lever is
damaged (for example, following a crash),
it might need to be replaced.
The battery is supplying too much
voltage to the controller. Make sure you
are using the correct battery for your bike.
For example, the 36V Dash 350W battery
will not work with the 48V Dash 500W,
triggering the error.
26 Overheat
Error
The controller or motor has overheated
from extended periods of extremely
heavy use (for example, climbing a steep
hill with maximum pedal assist applied.)
28 Low
Voltage
The voltage supplied by the battery is
too low to operate the bike. Charge the
battery and try again. If the issue persists,
check the voltage output on the battery
terminals using a volt meter.
29 Over
Voltage
30 Communication
Error
Poor connection between the controller
and the display, check all cable
connections.
SERFAS E-BIKE

The battery is not supplying the required
voltage to power the display and motor.
Use the display to view the real-time
voltage being output from the battery.
It can also be checked using a volt meter.
If the battery is old and has been charged
/ discharged many times, it may need to
be replaced. This error could also appear
if you install the wrong battery on your
Dash 350W/500W.
38 Battery Voltage
Error
E1E Communication
Error
Bad connection between display and
controller, disconnect and re-connect
display; ensure connection does not
have grit or contamination.
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SERFAS E-BIKE OWNER’S MANUAL

ADDITIONAL TROUBLESHOOTING
SERFAS E-BIKE
Having trouble with your Dash 350W/500W? Most problems are easy
to correct.
1. Start by making sure you have a charged battery.
2. If the motor of your bike will not engage, or only engages
intermittently, double check the cable connection where the rear
wheel motor plugs into the rest of the system. This connector
must be firmly and fully plugged in to function correctly. If
necessary, loosen the clips holding the cable to the frame to
create additonal slack in the cable, then re-tighten the clips after
you have the motor cable firmly plugged in.
3. The throttle on the Dash 350W/500W will only engage after the
motor is turned on via pedal assist. This is a safety feature
designed to prevent you from accidentally engaging the throttle
while parking or walking the bike. If you are having diculty with
the throttle, remember to make one revolution of the pedals
first, then engage the throttle. You can stop pedaling after the
throttle function turns on.
4. If you bent the derailleur hanger on your Dash 500W/350W in a
fall, don’t worry. It’s actually designed to fail, sparing the more
expensive frame, and is inexpensively replaceable for this reason.
If you need another, they are available on www.serfas.com or at
partner bike shops.
5. If your bike powers up normally and shows no error messages,
but will not run when you turn the pedal assist on, check to
ensure the cadence sensor under the left crankarm is plugged in.

BATTERY TROUBLESHOOTING
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SERFAS E-BIKE OWNER’S MANUAL
Your Dash 350W/500W e-bike battery uses several sophisticated
monitoring systems to prevent damage from overcharging, overheat
ing, deep battery discharge, charging with the wrong voltage, and
other errors.
Please use the specific charger supplied with your e-bike. Other
chargers may not supply the correct voltage required for charging.
Those that do may not be programmed to initiate the charge cycle. To
resolve this:
If a situation occurs that could damage the battery, the battery can go
into a protective “sleep mode” - the battery cells inside are OK, but the
battery won’t turn on and won’t take a charge. To “wake up” the
battery, please follow this procedure:
continued on next page...
1. Remove battery from the bike.
2. Plug the charging tip into the battery.
3. Plug the charger into wall power.
4. Tap the power button on the battery once to turn it on.
5. Charge the battery overnight.
6. When charging is complete, put the battery back on the bike and
check for proper operation. Having trouble with your Dash
350W/500W? Most problems are easy to correct.
1. Put the battery on the bike.
2. Plug the chaging tip into the battery.
3. Plug the charger into wall power.
4. Tap the power button on the battery once to turn it on.

5. Press and hold “M” on the controls to turn on the display.
6. Allow the battery to charge overnight.
7. Once charged, remove from wall power and check for
proper operation.
Under specific circumstances you might see one single LED
flashing constantly on the battery. One blinking LED is a warning
of excessive strain on the battery for its charge level. To correct
this issue:
1. Reduce the strain on the battery and charge the battery. If
it will not take a charge, please take the previous steps to
resolve the issue.
5 SERFAS E-BIKE

FREQUENTLY ASKED QUESTIONS
Do components from the Dash 350W and Dash 500W
interchange?
My Dash e-bike is too fast, or exceeds my local speed limit, or
only Class I e-bikes are allowed on my favorite bike path.
On the Dash line of e-bikes, I can’t use the throttle from a
dead stop, only once I’m pedaling. Why?
Some components interchange across the line of Dash e-bikes,
like saddles, seatposts, handlebars, and grips. The ebike
specific components, however, like batteries, controllers,
displays, and motor do not interchange. Dash 350W is a 36V
system vs 48V of the Dash 500W and these parts are not
compatible.
Dash e-bikes can have the speed limit changed using the
settings in the control panel and can be set as low as 14 MPH
if desired to comply with local laws. Dash e-bikes can also have
the throtlle unplugged and removed (but will continute to run on
pedal assist) if desired in locations where throttle bikes are
not permitted.
This is a safety feature to prevent you from accidentally
engaging the throttle while parking or standing with the bike,
if you forget to turn it o and then hit the throttle accidentally.
You can engage the throttle at any time while you are pedaling.
If you are at a dead stop, you can push the throttle, start
pedaling (about one pedal revolution), then stop pedaling,
and the bike will stay in throttle mode.
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SERFAS E-BIKE OWNER’S MANUAL

SERFAS E-BIKE
How many times can I recharge my e-bike battery?
Can I put a suspension fork on the Dash e-bike?
Do I have to wear a helmet when riding an e-bike?
Lithium-Ion e-bike batteries use a similar technology to your
laptop or smartphone. They can absorb about 500 charging
cycles before performance degrades. Afterwards, they
can continue to be recharged, however, their capacity will
decrease.
Yes, it is possible to put a suspension fork on the Dash line of
e-bikes. You would need a replacement fork with these specs:
1 1/8” to 1.5” tapered steerer tube, 51mm IS mount for disc
brakes (or a 74mm mount with an add-on adapter to 51mm),
27.5” / 650B wheel size, and the quick release / open type
dropout style. Selecting and installng a suspension fork is
probably a job for a bike shop.
We suggest you do. This depends on your age, and your state.
Please check your local laws.
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What rear rack fits the Serfas Dash e-bikes?
We recommend to check with your local bike shop.
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How should I care for my e-bike battery?
Please refer to the Battery and Charging section on page 6 of
your Dash 350W/500W owner’s manual.
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