Problem, Possible causes and remedies, And OFF regularly

The following table is useful for you to determine that cause of any problems that you might be able to fix yourself.

Problem	Possible causes and remedies
No indication on displays.	There is likely no power to the unit. Check the power supply
Power LED is not lit.	to be sure it is plugged in. Check the fuse on the front panel
	of the unit. Replace ONLY with the correct ½ amp fuse. DO
	NOT use a slow blow or higher value fuse as this can result
	in severe damage to the unit.
Power LED comes ON	Check to be sure the power supply is plugged in securely.
and OFF erratically	Try another outlet. Make sure the power connector is
	fastened tightly to the front of the unit.
Power LED flashes ON	Power supply voltage is too low. Check the power supply or
and OFF regularly	battery. The supply voltage must be at least 12 Volts with
	low power supply “ripple” for the unit to operate properly.
Unit blows fuses	Power supply voltage may be too high. The power supply
	voltage should be less than 20 Volts DC or damage to the
	unit will occur. Send the 2400S for repairs if the unit blows
	fuses when the power supply voltage is less than 20 Volts
	DC. Use only the correct size ( ½ amp) and type (fast blow)
	fuse – or severe damage to the unit will likely occur.
RPM display reads zero	Check the RPM pickup on the dynamometer. Be sure that it
all the time, or is erratic	is not loose. Check the wiring from the RPM pickup to the
	horsepower computer. Make sure the RPM sensor connector
	is tight. Have the horsepower computer checked.
Torque display reads –	Check the load cell on the dynamometer. Be sure that it is
EEE or some other value	not loose. Check the cable between the load cell and the
all the time (or is erratic)	horsepower computer. Make sure the Torque Sensor
	connector is tight. The load cell may be bad and need to be
	replaced. Have the horsepower computer checked.
Printer doesn’t work (or	Check the printer cable between the horsepower computer
works erratically)	and the printer. Be sure both ends are tight in their
	respective connectors. Make sure the printer is plugged into
	a proper power source. Perform a “self test” on the printer to
	be sure it is working. Have the horsepower computer
	checked.
Horsepower or Kilowatt	Check the torque calibration. If Chassis dyno, the tires may
readings are low or not	be slipping on the dynamometer rolls – increase chain
correct	tension to obtain more “over center” action between tires
	and rolls. Excess speed often causes power losses. If farm
	tractor, the PTO clutch may be slipping (refer to the tractor
	repair manual). Engine may not be performing properly.
	Have the horsepower computer checked.
RPM readings are	Operate the unit in the CHECK function. If the reading is
inaccurate	not 4000 RPM, have the horsepower computer repaired. If
	the CHECK reading is 4000 RPM, check the RPM pickup

Problem

Possible causes and remedies

No indication on displays.

There is likely no power to the unit. Check the power supply

Power LED is not lit.

to be sure it is plugged in. Check the fuse on the front panel

of the unit. Replace ONLY with the correct ½ amp fuse. DO

NOT use a slow blow or higher value fuse as this can result

in severe damage to the unit.

Power LED comes ON

Check to be sure the power supply is plugged in securely.

and OFF erratically

Try another outlet. Make sure the power connector is

fastened tightly to the front of the unit.

Power LED flashes ON

Power supply voltage is too low. Check the power supply or

and OFF regularly

battery. The supply voltage must be at least 12 Volts with

low power supply “ripple” for the unit to operate properly.

Unit blows fuses

Power supply voltage may be too high. The power supply

voltage should be less than 20 Volts DC or damage to the

unit will occur. Send the 2400S for repairs if the unit blows

fuses when the power supply voltage is less than 20 Volts

DC. Use only the correct size ( ½ amp) and type (fast blow)

fuse – or severe damage to the unit will likely occur.

RPM display reads zero

Check the RPM pickup on the dynamometer. Be sure that it

all the time, or is erratic

is not loose. Check the wiring from the RPM pickup to the

horsepower computer. Make sure the RPM sensor connector

is tight. Have the horsepower computer checked.

Torque display reads –

Check the load cell on the dynamometer. Be sure that it is

EEE or some other value

not loose. Check the cable between the load cell and the

all the time (or is erratic)

horsepower computer. Make sure the Torque Sensor

connector is tight. The load cell may be bad and need to be

replaced. Have the horsepower computer checked.

Printer doesn’t work (or

Check the printer cable between the horsepower computer

works erratically)

and the printer. Be sure both ends are tight in their

respective connectors. Make sure the printer is plugged into

a proper power source. Perform a “self test” on the printer to

be sure it is working. Have the horsepower computer

checked.

Horsepower or Kilowatt

Check the torque calibration. If Chassis dyno, the tires may

readings are low or not

be slipping on the dynamometer rolls – increase chain

correct

tension to obtain more “over center” action between tires

and rolls. Excess speed often causes power losses. If farm

tractor, the PTO clutch may be slipping (refer to the tractor

repair manual). Engine may not be performing properly.

Have the horsepower computer checked.

RPM readings are

Operate the unit in the CHECK function. If the reading is

inaccurate

not 4000 RPM, have the horsepower computer repaired. If

the CHECK reading is 4000 RPM, check the RPM pickup